Roy Johnsen
Om
Information about myself
After receiving a Dr.ing. degree from NTH in 1984, I joined Statoil Research Centre in Trondheim in 1985 to work within their “Material Technology” group. During this period I was involved in several research projects, material selection activities for new fields and failure analysis for existing fields. I also worked as Department Manager for some years.
In 1991 I joined CorrOcean in a combined management/technical position to develop the company from a small national company to be a leading international company within “Corrosion monitoring and corrosion management”. During my 13 years with CorrOcean the company grew from 30 people to 350 people with activities in all the major oil regions in the world. I also got the opportunity to visit the most important regions with oil activities in the world including Asia, Australia , South America, North America and Europe working with the leading oil companies and supplier industry. During my years in CorrOcean the company was listed on the Oslo Stock Exchange.
After 20 years in oil industry I accepted an offer to be a Professor within “Corrosion and Surface Technology” at IPM in 2004. I still have good contact with the industry and use my contact and experience to develop my courses and to get interesting industrial related projects both for master students and for PhD candidates.
I am present manager for the Strategic Area Materials (Tematisk Satsingsområde Materialer) at NTNU.
Fields of interest
- Material technology for the oil industry
- Corrosion of metallic materials for the process industry
- Corrosion protection by cathodic protection and/or coating
- Corrosion, erosion and wear resistant materials and surfaces
- Tribology (including tribo-corrosion)
- Integrity management of production systems
- Hydrogen embrittlement of metals
Research
In the following is given a short presentation of the main research projects I’m involved in:
HISC - Hydrogen induced stress cracking of stainless steels (2005 – 2011) JIP sponsored by Statoil, ConocoPhillips, Total, Shell, Petrobras, Chevron and supply industry.
Prevention of hydrogen induced stress cracking (HISC) in subsea pipelines and production systems made from stainless steels (2006- 2012) Project sponsored by the Norwegian Research Council through the Petromaks program.
NODE Advanced Riser Tensioning project (2007-2010) Project sponsored by the Norwegian Research Council through the Petromaks program together with National Oilwell Varco, Aker Solutions Maritime Hydraulics, Bosch Rexroth, Umoe Mandal, Statoil.
Pulsed plasma surface treatment (PPST) – effect on hydrogen embrittlement and hydrogen absorption and diffusion (2009-2012)
JIP sponsored by Total, Aker Solutions, FMC Kongsberg and MoTECH Plasma.
Smartpipe (2006-2010)
Project sponsored by the Norwegian Research Council through the Petromaks program together with oil companies and service industry.
NOWITECH – Norwegian Research Centre for OffshoreWind (2009-2015)
FME sponsored by The Norwegian Research Council and the industry. Participating in activities related to optimization of maintenance including coating technology.
Courses
| TMM4100/4105 | Materialteknikk |
|---|---|
| TMM4170/TMT4255 | Corrosion and corrosion protection |
| TMM4205 | Tribology and Surface technology |
| TMM4535 | Robust material selection and design – offshore applications |
Publikasjoner
2023
-
Lu, Xu;
Kattuputhur Soundararajan, Chandrahaasan;
Wang, Dong;
Johnsen, Roy.
(2023)
Failure investigation of Alloy 725 drive screw.
Technical report
Rapport
-
Blücher, Daniel;
Johnsen, Roy.
(2023)
Rustfritt stål er ikke alltid rustfritt.
Teknisk Ukeblad
Kronikk
-
Olden, Vigdis;
Johnsen, Roy;
Jemblie, Lise;
Hagen, Anette Brocks;
Hagen, Catalina Hoem Musinoi;
Zhang, Zhiliang.
(2023)
International Hydrogen and Materials Integrity Workshop 2023.
Annet produkt
-
Karimi, Shabnam;
Taji, Iman;
Hajilou, Tarlan;
Palencsar, Simona;
Dugstad, Arne;
Barnoush, Afrooz.
(2023)
Role of cementite morphology on corrosion layer formation of high-strength carbon steels in sweet and sour environments.
Corrosion Science
Vitenskapelig artikkel
-
Koren, Erik Aas;
Hagen, Catalina Hoem Musinoi;
Wang, Dong;
Lu, Xu;
Johnsen, Roy;
Yamabe, Junichiro.
(2023)
Experimental comparison of gaseous and electrochemical hydrogen charging in X65 pipeline steel using the permeation technique.
Corrosion Science
Vitenskapelig artikkel
-
Karimi, Shabnam;
Taji, Iman;
Palencsar, Simona;
Dugstad, Arne;
Hajilou, Tarlan;
Barnoush, Afrooz.
(2023)
Evaluation of microstructural and environmental effects on the hydrogen uptake and desorption in high-strength carbon steels: A thermal desorption spectroscopy study.
Corrosion Science
Vitenskapelig artikkel
-
Koren, Erik Aas;
Hagen, Catalina Hoem Musinoi;
Wang, Dong;
Lu, Xu;
Johnsen, Roy.
(2023)
Investigating electrochemical charging conditions equivalent to hydrogen gas exposure of X65 pipeline steel.
Materials and corrosion - Werkstoffe und Korrosion
Vitenskapelig artikkel
-
Lu, Xu;
Ma, Yan;
Ma, Yuan;
Wang, Dong;
Gao, Lei;
Song, Wenwen.
(2023)
Unravelling the effect of F phase on hydrogen-assisted intergranular cracking in nickel-based Alloy 725: Experimental and DFT study.
Corrosion Science
Vitenskapelig artikkel
2022
-
Skilbred, Ellen Synnøve;
Palencsar, Simona;
Dugstad, Arne;
Johnsen, Roy.
(2022)
Hydrogen uptake during active CO2-H2S corrosion of carbon steel wires in simulated annulus fluid.
Corrosion Science
Vitenskapelig artikkel
-
Lu, Xu;
Ma, Yan;
Peng, Ding;
Johnsen, Roy;
Wang, Dong.
(2022)
In situ nanomechanical characterization of hydrogen effects on nickel-based alloy 725 under different metallurgical conditions.
Journal of Materials Science & Technology
Vitenskapelig artikkel
-
Lu, Xu;
Depover, Tom;
Johnsen, Roy.
(2022)
Evaluation of hydrogen diffusion and trapping in nickel Alloy 625 by thermal desorption spectroscopy.
International Journal of Hydrogen Energy
Vitenskapelig artikkel
-
Hornus, Edgar;
Vouilloz, Francisco;
Long, Yu;
Andersen, Kjetil;
Krosness, Ola;
King, Mike.
(2022)
Growth Kinetics of Calcareous Deposits on Thermally Sprayed Aluminum Coatings in Natural Seawater.
Corrosion
Vitenskapelig artikkel
-
Lu, Xu;
Díaz, Andrés;
Ma, Jun;
Wang, Dong;
He, Jianying;
Zhang, Zhiliang.
(2022)
The effect of plastic deformation on hydrogen diffusion in nickel Alloy 625.
Scripta Materialia
Vitenskapelig artikkel
-
Wang, Dong;
Hagen, Anette Brocks;
Undrum Fathi, Pernille;
Lin, Meichao;
Johnsen, Roy;
Lu, Xu.
(2022)
Investigation of hydrogen embrittlement behavior in X65 pipeline steel under different hydrogen charging conditions.
Materials Science & Engineering: A
Vitenskapelig artikkel
-
Lu, Xu;
Wang, Dong;
Wan, Di;
Guo, Xiaofei;
Johnsen, Roy.
(2022)
Reveal hydrogen behavior at grain boundaries in Fe-22Mn-0.6C TWIP steel via in-situ micropillar compression test.
Acta Metallurgica Sinica (English Letters)
Vitenskapelig artikkel
-
Lu, Xu;
Wang, Dong;
Johnsen, Roy.
(2022)
Hydrogen diffusion and trapping in nickel-based alloy 625: An electrochemical permeation study.
Electrochimica Acta
Vitenskapelig artikkel
-
Karimi, Shabnam;
Taji, Iman;
Hajilou, Tarlan;
Barnoush, Afrooz;
Johnsen, Roy.
(2022)
Evaluation of the cementite morphology influence on the hydrogen induced crack nucleation and propagation path in carbon steels.
International Journal of Hydrogen Energy
Vitenskapelig artikkel
-
Maicas Esteve, Héctor;
Taji, Iman;
Wilms, Marc;
Gonzalez-Garcia, Yaiza;
Johnsen, Roy.
(2022)
Corrosion and Microstructural Investigation on Additively Manufactured 316L Stainless Steel: Experimental and Statistical Approach.
Materials
Vitenskapelig artikkel
-
Taji, Iman;
Hajilou, Tarlan;
Karimi, Shabnam;
Schott, Florian;
Plesiutschnig, Ernst;
Barnoush, Afrooz.
(2022)
Role of grain boundaries in hydrogen embrittlement of alloy 725: single and bi-crystal microcantilever bending study.
International Journal of Hydrogen Energy
Vitenskapelig artikkel
-
Taji, Iman;
Hajilou, Tarlan;
Ebner, Anna Sophie;
Scheiber, Daniel;
Karimi, Shabnam;
Plesiutschnig, Ernst.
(2022)
Hydrogen assisted intergranular cracking of alloy 725: The effect of boron and copper alloying.
Corrosion Science
Vitenskapelig artikkel
2021
-
Wang, Dong;
Lu, Xu;
Wan, Di;
Guo, Xiaofei;
Johnsen, Roy.
(2021)
Effect of hydrogen on the embrittlement susceptibility of Fe-22Mn-0.6C TWIP steel revealed by in-situ tensile tests.
Materials Science & Engineering: A
Vitenskapelig artikkel
-
Wang, Dong;
Lu, Xu;
Lin, Meichao;
Wan, Di;
Li, Zhiming;
He, Jianying.
(2021)
Understanding the hydrogen effect on pop-in behavior of an equiatomic high-entropy alloy during in-situ nanoindentation.
Journal of Materials Science & Technology
Vitenskapelig artikkel
-
Parow, Hanna;
Johnsen, Roy;
Skovhus, Torben Lund.
(2021)
MIC in the Fire Water Sprinkler System at St. Olavs Hospital, Trondheim, Norway.
CRC Press
Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
-
Wang, Dong;
Hagen, Anette Brocks;
Wan, Di;
Lu, Xu;
Johnsen, Roy.
(2021)
Probing hydrogen effect on nanomechanical properties of X65 pipeline steel using in-situ electrochemical nanoindentation.
Materials Science & Engineering: A
Vitenskapelig artikkel
-
Torres Rodriguez, Cristian;
Johnsen, Roy;
Iannuzzi, Mariano.
(2021)
Crevice corrosion of solution annealed 25Cr duplex stainless steels: Effect of W on critical temperatures.
Corrosion Science
Vitenskapelig artikkel
-
Skilbred, Ellen Synnøve;
Kappes, Mariano;
Iannuzzi, Mariano;
Johnsen, Roy.
(2021)
Hydrogen uptake and diffusivity in steel armor wires with different chemical composition, carbide distribution, grain size, and degree of deformation.
Materials and corrosion - Werkstoffe und Korrosion
Vitenskapelig artikkel
2020
-
Stenerud, Gaute;
Hajilou, Tarlan;
Olsen, Jim Stian;
Taji, Iman;
Barnoush, Afrooz;
Johnsen, Roy.
(2020)
The Effect of Hydrogen on the Nanoindentation Behavior of Heat Treated 718 Alloy.
Metals
Vitenskapelig artikkel
-
Torres Rodriguez, Cristian;
Iannuzzi, Mariano;
Johnsen, Roy.
(2020)
Use of the Critical Acidification Model to Estimate the Influence of W in the Localized Corrosion Resistance of 25Cr Super Duplex Stainless Steels.
Metals
Vitenskapelig artikkel
-
Torres Rodriguez, Cristian;
Hazarabedian, Maria Sofia;
Quadir, Zakaria;
Johnsen, Roy;
Iannuzzi, Mariano.
(2020)
The Role of Tungsten on the Phase Transformation Kinetics and its Correlation with the Localized Corrosion Resistance of 25Cr Super Duplex Stainless Steels.
Journal of the Electrochemical Society
Vitenskapelig artikkel
-
Skilbred, Ellen Synnøve;
Lootz, Signe Aarthun;
Johnsen, Roy.
(2020)
Hydrogen Embrittlement Susceptibility of Steel Armor Wires for Flexible Pipes.
International Corrosion Conference Series
Vitenskapelig artikkel
-
Lervik, Adrian;
Walmsley, John;
Lodgaard, Lars;
Marioara, Calin Daniel;
Johnsen, Roy;
Lunder, Otto.
(2020)
Stress Corrosion Cracking in an Extruded Cu-Free Al-Zn-Mg Alloy.
Metals
Vitenskapelig artikkel
2019
-
Stefansson, Njall;
Dunn, John;
Strand, Einar;
Johnsen, Roy;
Heimsæter, Martin Arne.
(2019)
Performance of high strength UNS N08830 in hydrogen stress crack testing to simulate conditions arising from subsea cathodic protection.
International Corrosion Conference Series
Vitenskapelig artikkel
-
Torres Rodriguez, Cristian;
Johnsen, Roy;
Østvold, Hege Kokslien;
Bernås, Mia;
Iannuzzi, Mariano.
(2019)
Effect ofW on Phase Transformation Kinetics and its Correlation with Localized Corrosion Resistance for UNS S39274.
International Corrosion Conference Series
Vitenskapelig artikkel
-
Kheradmand, Nousha;
Rogne, Bjørn Rune Sørås;
Dumoulin, Stephane;
Deng, Yun;
Johnsen, Roy;
Barnoush, Afrooz.
(2019)
Small scale testing approach to reveal specific features of slip behavior in BCC metals.
Acta Materialia
Vitenskapelig artikkel
-
Johnsen, Roy;
Olavesen, Henrik Horten;
Hossein Zavieh, Amin;
Erlien, Tomas Laugsand.
(2019)
Effect of cathodic polarization on localized corrosion of 25Cr in seawater.
International Corrosion Conference Series
Vitenskapelig artikkel
-
Ingdal, Mats;
Johnsen, Roy;
Harrington, David A..
(2019)
The Akaike information criterion in weighted regression of immittance data.
Electrochimica Acta
Vitenskapelig artikkel
-
Johnsen, Roy;
Gjelseng, Linn Cecilie;
Heimsæter, Martin Arne;
Jernberg, Anders;
Qvale, Atle H.
(2019)
Influence of Manufacturing Process and Resulting Microstructure on HISC Susceptibility of 25Cr Duplex Stainless Steel Pipe.
International Corrosion Conference Series
Vitenskapelig artikkel
-
Wilson, Håvard;
Johnsen, Roy;
Torres Rodriguez, Cristian;
Hesjevik, Sven Morten.
(2019)
Properties of TSA in natural seawater at ambient and elevated temperature.
Materials and corrosion - Werkstoffe und Korrosion
Vitenskapelig artikkel
2018
-
Johnsen, Roy;
Lange, Torstein;
Stenerud, Gaute;
Olsen, Jim Stian.
(2018)
Environmentally assisted degradation of spinodal copper alloy C72900.
Corrosion Science
Vitenskapelig artikkel
-
Ryen, Audun;
Johnsen, Roy;
Iannuzzi, Mariano;
Årtun, Lars.
(2018)
Cathodic protection by distributed sacrificial anodes - Performance at elevated temperature and in mud.
International Corrosion Conference Series
Vitenskapelig artikkel
-
Stenerud, Gaute;
Wenner, Sigurd;
Olsen, Jim Stian;
Johnsen, Roy.
(2018)
Effect of different microstructural features on the hydrogen embrittlement susceptibility of alloy 718.
International Journal of Hydrogen Energy
Vitenskapelig artikkel
-
Torres Rodriguez, Cristian;
Kappes, Mariano A;
Johnsen, Roy;
Iannuzzi, Mariano.
(2018)
Influence of tungsten on passivity breakdown and repassivation of 25CR super duplex stainless steel.
International Corrosion Conference Series
Vitenskapelig artikkel
-
Husby, Hans;
Wagstaff, Philip Haakon;
Iannuzzi, Mariano;
Johnsen, Roy;
Kappes, Mariano A.
(2018)
Effect of Nickel on the Hydrogen Stress Cracking Resistance of Ferritic/Pearlitic Low Alloy Steels.
Corrosion
Vitenskapelig artikkel
-
Bernås, Mia;
Westermann, Ida;
Johnsen, Roy;
Torres Rodriguez, Cristian;
Jernberg, Anders;
Qvale, Atle H.
(2018)
Effect of tungsten on the precipitation kinetics and localized corrosion resistance of super duplex stainless steels.
International Corrosion Conference Series
Vitenskapelig artikkel
-
Krogstad, Hedda Nordby;
Johnsen, Roy;
Coey, Michael.
(2018)
Effect of a uniform magnetic field on corrosion of Ni-Al bronze in 3.5wt% NaCl.
Corrosion
Vitenskapelig artikkel
-
Krogstad, Hedda Nordby;
Johnsen, Roy;
Coey, Michael.
(2018)
Effect of a time-dependent magnetic field on the corrosion of Ni-Al bronze.
Corrosion
Vitenskapelig artikkel
-
Stenerud, Gaute;
Johnsen, Roy;
Olsen, Jim Stian.
(2018)
Hydrogen stress cracking and crack initiation in precipitation hardened Ni-alloys.
Engineering Failure Analysis
Vitenskapelig artikkel
-
Hajilou, Tarlan;
Hope, Malin Sofie B.;
Hossein Zavieh, Amin;
Kheradmand, Nousha;
Johnsen, Roy;
Barnoush, Afrooz.
(2018)
In situ small-scale hydrogen embrittlement testing made easy: An electrolyte for preserving surface integrity at nano-scale during hydrogen charging.
International Journal of Hydrogen Energy
Vitenskapelig artikkel
-
Husby, Hans;
Iannuzzi, Mariano;
Johnsen, Roy;
Mariano, Kappes;
Barnoush, Afrooz.
(2018)
Effect of nickel on hydrogen permeation in ferritic/
pearlitic low alloy steels.
International Journal of Hydrogen Energy
Vitenskapelig artikkel
-
Wold, Kristian;
Johnsen, Roy;
Iannuzzi, Mariano;
Årtun, Lars.
(2018)
Integrated cathodic protection (CP) sensor network development of the CP sensor.
International Corrosion Conference Series
Vitenskapelig artikkel
2017
-
Haugan, Eirik;
Næss, Monika;
Torres Rodriguez, Cristian;
Johnsen, Roy;
Iannuzzi, Mariano.
(2017)
Effect of tungsten on the pitting and crevice corrosion resistance of Type 25Cr super duplex stainless steels.
Corrosion
Vitenskapelig artikkel
-
Farhat, Hanan;
Johnsen, Roy.
(2017)
Hydrogen sulfide tube failure in a seawater heat exchanger.
Materials performance
Vitenskapelig artikkel
-
Krogstad, Hedda Nordby;
Skilbred, Ellen Synnøve;
Johnsen, Roy.
(2017)
Corrosion of nickel aluminium bronze - Effect of alloying elements and pH.
International Corrosion Conference Series
Vitenskapelig artikkel
-
Johnsen, Roy;
Nese, Ove.
(2017)
AA5083 and AA6082 exposed to seawater - Effect of potential on corrosion behaviour.
International Corrosion Conference Series
Vitenskapelig artikkel
-
Bernås, Mia;
Westermann, Ida;
Johnsen, Roy;
Lauritsen, Christian;
Iannuzzi, Mariano.
(2017)
Effect of microstructure on the corrosion resistance of duplex stainless steels: Materials performance maps.
International Corrosion Conference Series
Vitenskapelig artikkel
-
Krogstad, Hedda Nordby;
Johnsen, Roy;
Coey, M.
(2017)
Corrosion of nickel aluminium bronze - Effect of a uniform magnetic field.
International Corrosion Conference Series
Vitenskapelig artikkel
-
Quale, Geir;
Iannuzzi, Mariano;
Johnsen, Roy.
(2017)
Cathodic protection by distributed sacrificial anodes - A new cost-effective solution to prevent corrosion of subsea structures.
International Corrosion Conference Series
Vitenskapelig artikkel
-
Krogstad, Hedda Nordby;
Johnsen, Roy.
(2017)
Corrosion properties of nickel-aluminium bronze in natural seawater?Effect of galvanic coupling to UNS S31603.
Corrosion Science
Vitenskapelig artikkel
-
Stenerud, Gaute;
Johnsen, Roy;
Olsen, Jim Stian;
He, Jianying;
Barnoush, Afrooz.
(2017)
Effect of hydrogen on dislocation nucleation in alloy 718.
International Journal of Hydrogen Energy
Vitenskapelig artikkel
-
Iannuzzi, Mariano;
Barnoush, Afrooz;
Johnsen, Roy.
(2017)
Materials and corrosion trends in offshore and subsea oil and gas production.
npj Materials Degradation
Vitenskapelig artikkel
2016
-
Kheradmand, Nousha;
Johnsen, Roy;
Olsen, Jim Stian;
Barnoush, Afrooz.
(2016)
Effect of Hydrogen on the hardness of different phases in super duplex stainless steel.
International Journal of Hydrogen Energy
Vitenskapelig artikkel
-
Lange, Torstein;
Bengtsson Blucher, Daniel;
Venkataraman, Shankar;
Jakobi, Dietinde;
Asteman, Henrik;
Johnsen, Roy.
(2016)
A new cast Ni-base alloy suitable for severe sour service.
International Corrosion Conference Series
Vitenskapelig artikkel
-
Næss, Monika;
Johnsen, Roy;
Haugan, Eirik Bjørge;
Iannuzzi, Mariano.
(2016)
Effect of tungsten on pitting and crevice corrosion of type 25Cr super duplex stainless steel.
International Corrosion Conference Series
Vitenskapelig artikkel
2015
-
Stenerud, Gaute;
Johnsen, Roy;
Olsen, Jim Stian.
(2015)
Susceptibility to Hydrogen Induced Stress Cracking of UNS N07718 and UNS N07725 under cathodic polarization.
International Corrosion Conference Series
Vitenskapelig artikkel
-
Næss, Monika E;
Iannuzzi, Mariano;
Johnsen, Roy.
(2015)
Use of electrochemical techniques to determine the effect of sigma (σ)-phase precipitation on a 25 wt% CR super duplex stainless steel.
International Corrosion Conference Series
Vitenskapelig artikkel
-
Castberg, Tore Støren;
Johnsen, Roy;
Berget, J.
(2015)
Corrosion and subsequent erosion of hardmetals: Dependence of WC grain size and distribution, and binder composition.
Materials and corrosion - Werkstoffe und Korrosion
Vitenskapelig artikkel
-
Holager, Cathrine Selina;
Johnsen, Roy;
Nisancioglu, Kemal.
(2015)
Corrosion of thermally sprayed aluminum in flowing seawater.
International Corrosion Conference Series
Vitenskapelig artikkel
2014
-
Olden, Vigdis;
Saai, Afaf;
Jemblie, Lise;
Johnsen, Roy.
(2014)
FE simulation of hydrogen diffusion in duplex stainless steel.
International Journal of Hydrogen Energy
Vitenskapelig artikkel
2013
-
Baltzersen, Øystein;
Johnsen, Roy;
Martinussen, H;
Nerbø, Ingar Stian.
(2013)
Using permanently installed ultrasound monitoring to maximize the lifetime of a pipeline.
International Corrosion Conference Series
Vitenskapelig artikkel
-
Brataas, Arne;
Mathiesen, Ragnvald;
Grande, Tor;
Roven, Hans Jørgen;
Grepstad, Jostein;
Echtermeyer, Andreas.
(2013)
Enabling technologies at NTNU; materials science and engineering.
NTNU
Rapport
-
Espallargas, Nuria;
Johnsen, Roy;
Torres, Christian Rodriguez;
Igual Munoz, Anna.
(2013)
A new experimental technique for quantifying the galvanic coupling effects on stainless steel during tribocorrosion under equilibrium conditions.
Wear
Vitenskapelig artikkel
-
Barnoush, Afrooz;
Asgari, Masoud;
Johnsen, Roy;
Hoel, Rune.
(2013)
Hydrogen Effect on Nanomechanical Properties of the Nitrided Steel.
Metallurgical and Materials Transactions A
Vitenskapelig artikkel
-
Asgari, Masoud;
S. Azar, Amin;
Barnoush, Afrooz;
Johnsen, Roy.
(2013)
Orientation Relationships and Texture of the Iron-Nitride Phase Constituents in Pulsed Plasma Nitriding.
Metallurgical and Materials Transactions A
Vitenskapelig artikkel
-
Asgari, Masoud;
Barnoush, Afrooz;
Johnsen, Roy;
Hoel, Rune.
(2013)
Small-scale structural and mechanical characterization of the nitrided layer in martensitic steel.
Tribology International
Vitenskapelig artikkel
-
Asgari, Masoud;
Johnsen, Roy;
Barnoush, Afrooz.
(2013)
Nanomechanical characterization of the hydrogen effect on pulsed plasma nitrided super duplex stainless steel.
International Journal of Hydrogen Energy
Vitenskapelig artikkel
-
Castberg, Tore Støren;
Johnsen, Roy;
Berget, John.
(2013)
Erosion of hardmetals: Dependence of WC grain size and distribution, and binder composition.
Wear
Vitenskapelig artikkel
2012
-
Barnoush, Afrooz;
Asgari, Masoud;
Johnsen, Roy.
(2012)
Resolving the hydrogen effect on dislocation nucleation and mobility by electrochemical nanoindentation.
Scripta Materialia
Vitenskapelig artikkel
-
De Ridder, Karin;
Pape, Kristine;
Johnsen, Roy;
Westin, Steinar;
Holmen, Turid Lingaas;
Bjørngaard, Johan Håkon.
(2012)
Adolescent health is associated with high school dropout, independent of parental socioeconomic status: a prospective population study, The Young-HUNT 1 study (Norway).
European Journal of Public Health
Sammendrag/abstract
-
Perez Ramirez, Pedro Agustin;
Johnsen, Roy;
Utne, Ingrid Bouwer.
(2012)
Probabilistic condition assessment of aging equipment considering the effect of operating conditions and maintenance.
The American Society of Mechanical Engineers (ASME)
Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
-
Asgari, Masoud;
Barnoush, Afrooz;
Johnsen, Roy;
Hoel, Rune.
(2012)
Nanomechanical evaluation of the protectiveness of nitrided layers against hydrogen embrittlement.
Corrosion Science
Vitenskapelig artikkel
-
Von der Ohe, Christian Bertil;
Johnsen, Roy;
Espallargas, Nuria.
(2012)
Multi-degradation behavior of austenitic and super duplex stainless steel - The effect of 4-point static and cyclic bending applied to a simulated seawater tribocorrosion system.
Wear
Vitenskapelig artikkel
2011
-
Von der Ohe, Christian Bertil;
Johnsen, Roy;
Espallargas, Nuria.
(2011)
A multi-degradation test rig for studying the synergy effects of tribocorrosion interacting with 4-point static and cyclic bending.
Wear
Vitenskapelig artikkel
-
Hörnlund, Erik;
Ersdal, Gerhard;
Hinderaker, Rolf H.;
Johnsen, Roy;
Sharp, John M..
(2011)
Material Issues in Ageing and Life Extension (OMAE2011-49363).
The American Society of Mechanical Engineers (ASME)
Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
-
Johnsen, Roy.
(2011)
Tribocorrosion in Marine Environments.
Woodhead Publishing Limited
Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
-
Asgari, Masoud;
Barnoush, Afrooz;
Johnsen, Roy;
Hoel, Rune.
(2011)
Microstructural characterization of pulsed plasma nitrided 316L stainless steel.
Materials Science & Engineering: A
Vitenskapelig artikkel
-
Rommetveit, Tarjei;
Johansen, Tonni Franke;
Johnsen, Roy.
(2011)
Using a multi-layered transducer model to estimate the properties of paraffin wax deposited on steel.
Ultrasonics
Vitenskapelig artikkel
2010
-
von der Ohe, Christian B.;
Johnsen, Roy;
Espallargas, Nuria.
(2010)
Modeling the multi-degradation mechanisms of combined tribocorrosion interacting with static and cyclic loaded surfaces of passive metals exposed to seawater.
Wear
Vitenskapelig artikkel
-
Axelsen, Sten Bjarne;
Johnsen, Roy;
Knudsen, Ole Øystein.
(2010)
Mechanical Properties of Polysiloxane Topcoats.
Corrosion
Vitenskapelig artikkel
-
Rommetveit, Tarjei;
Johansen, Tonni Franke;
Johnsen, Roy.
(2010)
A Combined Approach for High-Resolution Corrosion Monitoring and Temperature Compensation Using Ultrasound.
IEEE Transactions on Instrumentation and Measurement
Vitenskapelig artikkel
-
Axelsen, Sten Bjarne;
Johnsen, Roy;
Knudsen, Ole Øystein.
(2010)
Internal Stress in Polysiloxane Topcoats.
Corrosion
Vitenskapelig artikkel
-
Axelsen, Sten Bjarne;
Sjaastad, A;
Knudsen, Ole Øystein;
Johnsen, Roy.
(2010)
Protective Coatings Offshore: Introducing a Risk-Based Maintenance Management System-Part 3: A Case Study.
Corrosion
Vitenskapelig artikkel
-
Axelsen, Sten Bjarne;
Knudsen, Ole Øystein;
Johnsen, Roy.
(2010)
Protective Coatings Offshore: Introducing a Risk-Based Maintenance Management System-Part 2: Framework Establishment.
Corrosion
Vitenskapelig artikkel
-
Laustad, Gro;
Johnsen, Roy;
Asbjørnsen, Ingvild;
Bjurstrøm, Martin;
Hjorth, C.G.
(2010)
Resistance Toward Hydrogen-Induced Stress Cracking of Hot Isostatically Pressed Duplex Stainles Steel under Cathodic Protection.
Corrosion
Vitenskapelig artikkel
-
Axelsen, Sten Bjarne;
Johnsen, Roy;
Knudsen, Ole Øystein.
(2010)
Adhesion Properties of Polysiloxane Topcoats.
Corrosion
Vitenskapelig artikkel
2009
-
von der Ohe, Christian B.;
Johnsen, Roy;
Espallargas, Nuria.
(2009)
Hydraulic Cylinders for Offshore Splash Zone Operation: A Review of Piston Rod Failure Cases and Alternative Concepts.
Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
-
Johnsen, Roy;
Nyhus, Bård;
Wästberg, Stig.
(2009)
Hydrogen Embrittlement of Stainless Steels Under Cathodic Protection in Seawater - Presentation of a New Test Method.
Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
-
Axelsen, Sten Bjarne;
Knudsen, Ole Øystein;
Johnsen, Roy.
(2009)
Protective Coatings Offshore: Introducing a Risk-Based Maintenance Management System - Part 1: Risk Analysis Methodology.
Corrosion
Vitenskapelig artikkel
-
Olden, Vigdis;
Thaulow, Christian;
Johnsen, Roy;
Østby, Erling;
Berstad, Torodd.
(2009)
Influence of hydrogen from cathodic protection on the fracture susceptibility of 25%Cr duplex stainless steel - Constant load SENT testing and FE-modelling using hydrogen influenced cohesive zone elements.
Engineering Fracture Mechanics
Vitenskapelig artikkel
2008
-
Olden, Vigdis;
Thaulow, Christian;
Johnsen, Roy;
Østby, Erling;
Berstad, Torodd.
(2008)
Application of hydrogen influenced cohesive laws in the prediction of hydrogen induced stress cracking in 25%Cr duplex stainless steel.
Engineering Fracture Mechanics
Vitenskapelig artikkel
-
Olden, Vigdis;
Thaulow, Christian;
Johnsen, Roy.
(2008)
Modelling of hydrogen diffusion and hydrogen induced cracking in supermartensitic and duplex stainless steels.
Materials & design
Vitenskapelig oversiktsartikkel/review
2007
-
Johnsen, Roy.
(2007)
Experience with the use of copper alloys in seawater systems on the Norwegian Continental Shelf.
Woodhead Publishing Limited
Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
-
Okstad, Trine;
Rannestad, Øyvind;
Johnsen, Roy;
Nisancioglu, Kemal.
(2007)
Significance of hydrogen evolution during cathodic protection of carbon steel in Seawater.
Corrosion
Vitenskapelig artikkel
-
Olden, Vigdis;
Thaulow, Christian;
Johnsen, Roy;
Østby, Erling.
(2007)
Cohesive Zone Modeling of hydrogen-induced stress cracking in 25% Cr duplex stainless steel.
Scripta Materialia
Vitenskapelig artikkel
2006
-
Johnsen, Roy;
Gjerding-Smith, Knut;
Lange, Hans Iver;
Leinum, Bente;
Gundersen, Gunnar;
Isaksen, Bjørn.
(2006)
Wire fracture in locked coil cables.
Bridge Structures - Assessment, Design and Construction
Vitenskapelig artikkel
Tidsskriftspublikasjoner
-
Blücher, Daniel;
Johnsen, Roy.
(2023)
Rustfritt stål er ikke alltid rustfritt.
Teknisk Ukeblad
Kronikk
-
Karimi, Shabnam;
Taji, Iman;
Hajilou, Tarlan;
Palencsar, Simona;
Dugstad, Arne;
Barnoush, Afrooz.
(2023)
Role of cementite morphology on corrosion layer formation of high-strength carbon steels in sweet and sour environments.
Corrosion Science
Vitenskapelig artikkel
-
Koren, Erik Aas;
Hagen, Catalina Hoem Musinoi;
Wang, Dong;
Lu, Xu;
Johnsen, Roy;
Yamabe, Junichiro.
(2023)
Experimental comparison of gaseous and electrochemical hydrogen charging in X65 pipeline steel using the permeation technique.
Corrosion Science
Vitenskapelig artikkel
-
Karimi, Shabnam;
Taji, Iman;
Palencsar, Simona;
Dugstad, Arne;
Hajilou, Tarlan;
Barnoush, Afrooz.
(2023)
Evaluation of microstructural and environmental effects on the hydrogen uptake and desorption in high-strength carbon steels: A thermal desorption spectroscopy study.
Corrosion Science
Vitenskapelig artikkel
-
Koren, Erik Aas;
Hagen, Catalina Hoem Musinoi;
Wang, Dong;
Lu, Xu;
Johnsen, Roy.
(2023)
Investigating electrochemical charging conditions equivalent to hydrogen gas exposure of X65 pipeline steel.
Materials and corrosion - Werkstoffe und Korrosion
Vitenskapelig artikkel
-
Lu, Xu;
Ma, Yan;
Ma, Yuan;
Wang, Dong;
Gao, Lei;
Song, Wenwen.
(2023)
Unravelling the effect of F phase on hydrogen-assisted intergranular cracking in nickel-based Alloy 725: Experimental and DFT study.
Corrosion Science
Vitenskapelig artikkel
-
Skilbred, Ellen Synnøve;
Palencsar, Simona;
Dugstad, Arne;
Johnsen, Roy.
(2022)
Hydrogen uptake during active CO2-H2S corrosion of carbon steel wires in simulated annulus fluid.
Corrosion Science
Vitenskapelig artikkel
-
Lu, Xu;
Ma, Yan;
Peng, Ding;
Johnsen, Roy;
Wang, Dong.
(2022)
In situ nanomechanical characterization of hydrogen effects on nickel-based alloy 725 under different metallurgical conditions.
Journal of Materials Science & Technology
Vitenskapelig artikkel
-
Lu, Xu;
Depover, Tom;
Johnsen, Roy.
(2022)
Evaluation of hydrogen diffusion and trapping in nickel Alloy 625 by thermal desorption spectroscopy.
International Journal of Hydrogen Energy
Vitenskapelig artikkel
-
Hornus, Edgar;
Vouilloz, Francisco;
Long, Yu;
Andersen, Kjetil;
Krosness, Ola;
King, Mike.
(2022)
Growth Kinetics of Calcareous Deposits on Thermally Sprayed Aluminum Coatings in Natural Seawater.
Corrosion
Vitenskapelig artikkel
-
Lu, Xu;
Díaz, Andrés;
Ma, Jun;
Wang, Dong;
He, Jianying;
Zhang, Zhiliang.
(2022)
The effect of plastic deformation on hydrogen diffusion in nickel Alloy 625.
Scripta Materialia
Vitenskapelig artikkel
-
Wang, Dong;
Hagen, Anette Brocks;
Undrum Fathi, Pernille;
Lin, Meichao;
Johnsen, Roy;
Lu, Xu.
(2022)
Investigation of hydrogen embrittlement behavior in X65 pipeline steel under different hydrogen charging conditions.
Materials Science & Engineering: A
Vitenskapelig artikkel
-
Lu, Xu;
Wang, Dong;
Wan, Di;
Guo, Xiaofei;
Johnsen, Roy.
(2022)
Reveal hydrogen behavior at grain boundaries in Fe-22Mn-0.6C TWIP steel via in-situ micropillar compression test.
Acta Metallurgica Sinica (English Letters)
Vitenskapelig artikkel
-
Lu, Xu;
Wang, Dong;
Johnsen, Roy.
(2022)
Hydrogen diffusion and trapping in nickel-based alloy 625: An electrochemical permeation study.
Electrochimica Acta
Vitenskapelig artikkel
-
Karimi, Shabnam;
Taji, Iman;
Hajilou, Tarlan;
Barnoush, Afrooz;
Johnsen, Roy.
(2022)
Evaluation of the cementite morphology influence on the hydrogen induced crack nucleation and propagation path in carbon steels.
International Journal of Hydrogen Energy
Vitenskapelig artikkel
-
Maicas Esteve, Héctor;
Taji, Iman;
Wilms, Marc;
Gonzalez-Garcia, Yaiza;
Johnsen, Roy.
(2022)
Corrosion and Microstructural Investigation on Additively Manufactured 316L Stainless Steel: Experimental and Statistical Approach.
Materials
Vitenskapelig artikkel
-
Taji, Iman;
Hajilou, Tarlan;
Karimi, Shabnam;
Schott, Florian;
Plesiutschnig, Ernst;
Barnoush, Afrooz.
(2022)
Role of grain boundaries in hydrogen embrittlement of alloy 725: single and bi-crystal microcantilever bending study.
International Journal of Hydrogen Energy
Vitenskapelig artikkel
-
Taji, Iman;
Hajilou, Tarlan;
Ebner, Anna Sophie;
Scheiber, Daniel;
Karimi, Shabnam;
Plesiutschnig, Ernst.
(2022)
Hydrogen assisted intergranular cracking of alloy 725: The effect of boron and copper alloying.
Corrosion Science
Vitenskapelig artikkel
-
Wang, Dong;
Lu, Xu;
Wan, Di;
Guo, Xiaofei;
Johnsen, Roy.
(2021)
Effect of hydrogen on the embrittlement susceptibility of Fe-22Mn-0.6C TWIP steel revealed by in-situ tensile tests.
Materials Science & Engineering: A
Vitenskapelig artikkel
-
Wang, Dong;
Lu, Xu;
Lin, Meichao;
Wan, Di;
Li, Zhiming;
He, Jianying.
(2021)
Understanding the hydrogen effect on pop-in behavior of an equiatomic high-entropy alloy during in-situ nanoindentation.
Journal of Materials Science & Technology
Vitenskapelig artikkel
-
Wang, Dong;
Hagen, Anette Brocks;
Wan, Di;
Lu, Xu;
Johnsen, Roy.
(2021)
Probing hydrogen effect on nanomechanical properties of X65 pipeline steel using in-situ electrochemical nanoindentation.
Materials Science & Engineering: A
Vitenskapelig artikkel
-
Torres Rodriguez, Cristian;
Johnsen, Roy;
Iannuzzi, Mariano.
(2021)
Crevice corrosion of solution annealed 25Cr duplex stainless steels: Effect of W on critical temperatures.
Corrosion Science
Vitenskapelig artikkel
-
Skilbred, Ellen Synnøve;
Kappes, Mariano;
Iannuzzi, Mariano;
Johnsen, Roy.
(2021)
Hydrogen uptake and diffusivity in steel armor wires with different chemical composition, carbide distribution, grain size, and degree of deformation.
Materials and corrosion - Werkstoffe und Korrosion
Vitenskapelig artikkel
-
Stenerud, Gaute;
Hajilou, Tarlan;
Olsen, Jim Stian;
Taji, Iman;
Barnoush, Afrooz;
Johnsen, Roy.
(2020)
The Effect of Hydrogen on the Nanoindentation Behavior of Heat Treated 718 Alloy.
Metals
Vitenskapelig artikkel
-
Torres Rodriguez, Cristian;
Iannuzzi, Mariano;
Johnsen, Roy.
(2020)
Use of the Critical Acidification Model to Estimate the Influence of W in the Localized Corrosion Resistance of 25Cr Super Duplex Stainless Steels.
Metals
Vitenskapelig artikkel
-
Torres Rodriguez, Cristian;
Hazarabedian, Maria Sofia;
Quadir, Zakaria;
Johnsen, Roy;
Iannuzzi, Mariano.
(2020)
The Role of Tungsten on the Phase Transformation Kinetics and its Correlation with the Localized Corrosion Resistance of 25Cr Super Duplex Stainless Steels.
Journal of the Electrochemical Society
Vitenskapelig artikkel
-
Skilbred, Ellen Synnøve;
Lootz, Signe Aarthun;
Johnsen, Roy.
(2020)
Hydrogen Embrittlement Susceptibility of Steel Armor Wires for Flexible Pipes.
International Corrosion Conference Series
Vitenskapelig artikkel
-
Lervik, Adrian;
Walmsley, John;
Lodgaard, Lars;
Marioara, Calin Daniel;
Johnsen, Roy;
Lunder, Otto.
(2020)
Stress Corrosion Cracking in an Extruded Cu-Free Al-Zn-Mg Alloy.
Metals
Vitenskapelig artikkel
-
Stefansson, Njall;
Dunn, John;
Strand, Einar;
Johnsen, Roy;
Heimsæter, Martin Arne.
(2019)
Performance of high strength UNS N08830 in hydrogen stress crack testing to simulate conditions arising from subsea cathodic protection.
International Corrosion Conference Series
Vitenskapelig artikkel
-
Torres Rodriguez, Cristian;
Johnsen, Roy;
Østvold, Hege Kokslien;
Bernås, Mia;
Iannuzzi, Mariano.
(2019)
Effect ofW on Phase Transformation Kinetics and its Correlation with Localized Corrosion Resistance for UNS S39274.
International Corrosion Conference Series
Vitenskapelig artikkel
-
Kheradmand, Nousha;
Rogne, Bjørn Rune Sørås;
Dumoulin, Stephane;
Deng, Yun;
Johnsen, Roy;
Barnoush, Afrooz.
(2019)
Small scale testing approach to reveal specific features of slip behavior in BCC metals.
Acta Materialia
Vitenskapelig artikkel
-
Johnsen, Roy;
Olavesen, Henrik Horten;
Hossein Zavieh, Amin;
Erlien, Tomas Laugsand.
(2019)
Effect of cathodic polarization on localized corrosion of 25Cr in seawater.
International Corrosion Conference Series
Vitenskapelig artikkel
-
Ingdal, Mats;
Johnsen, Roy;
Harrington, David A..
(2019)
The Akaike information criterion in weighted regression of immittance data.
Electrochimica Acta
Vitenskapelig artikkel
-
Johnsen, Roy;
Gjelseng, Linn Cecilie;
Heimsæter, Martin Arne;
Jernberg, Anders;
Qvale, Atle H.
(2019)
Influence of Manufacturing Process and Resulting Microstructure on HISC Susceptibility of 25Cr Duplex Stainless Steel Pipe.
International Corrosion Conference Series
Vitenskapelig artikkel
-
Wilson, Håvard;
Johnsen, Roy;
Torres Rodriguez, Cristian;
Hesjevik, Sven Morten.
(2019)
Properties of TSA in natural seawater at ambient and elevated temperature.
Materials and corrosion - Werkstoffe und Korrosion
Vitenskapelig artikkel
-
Johnsen, Roy;
Lange, Torstein;
Stenerud, Gaute;
Olsen, Jim Stian.
(2018)
Environmentally assisted degradation of spinodal copper alloy C72900.
Corrosion Science
Vitenskapelig artikkel
-
Ryen, Audun;
Johnsen, Roy;
Iannuzzi, Mariano;
Årtun, Lars.
(2018)
Cathodic protection by distributed sacrificial anodes - Performance at elevated temperature and in mud.
International Corrosion Conference Series
Vitenskapelig artikkel
-
Stenerud, Gaute;
Wenner, Sigurd;
Olsen, Jim Stian;
Johnsen, Roy.
(2018)
Effect of different microstructural features on the hydrogen embrittlement susceptibility of alloy 718.
International Journal of Hydrogen Energy
Vitenskapelig artikkel
-
Torres Rodriguez, Cristian;
Kappes, Mariano A;
Johnsen, Roy;
Iannuzzi, Mariano.
(2018)
Influence of tungsten on passivity breakdown and repassivation of 25CR super duplex stainless steel.
International Corrosion Conference Series
Vitenskapelig artikkel
-
Husby, Hans;
Wagstaff, Philip Haakon;
Iannuzzi, Mariano;
Johnsen, Roy;
Kappes, Mariano A.
(2018)
Effect of Nickel on the Hydrogen Stress Cracking Resistance of Ferritic/Pearlitic Low Alloy Steels.
Corrosion
Vitenskapelig artikkel
-
Bernås, Mia;
Westermann, Ida;
Johnsen, Roy;
Torres Rodriguez, Cristian;
Jernberg, Anders;
Qvale, Atle H.
(2018)
Effect of tungsten on the precipitation kinetics and localized corrosion resistance of super duplex stainless steels.
International Corrosion Conference Series
Vitenskapelig artikkel
-
Krogstad, Hedda Nordby;
Johnsen, Roy;
Coey, Michael.
(2018)
Effect of a uniform magnetic field on corrosion of Ni-Al bronze in 3.5wt% NaCl.
Corrosion
Vitenskapelig artikkel
-
Krogstad, Hedda Nordby;
Johnsen, Roy;
Coey, Michael.
(2018)
Effect of a time-dependent magnetic field on the corrosion of Ni-Al bronze.
Corrosion
Vitenskapelig artikkel
-
Stenerud, Gaute;
Johnsen, Roy;
Olsen, Jim Stian.
(2018)
Hydrogen stress cracking and crack initiation in precipitation hardened Ni-alloys.
Engineering Failure Analysis
Vitenskapelig artikkel
-
Hajilou, Tarlan;
Hope, Malin Sofie B.;
Hossein Zavieh, Amin;
Kheradmand, Nousha;
Johnsen, Roy;
Barnoush, Afrooz.
(2018)
In situ small-scale hydrogen embrittlement testing made easy: An electrolyte for preserving surface integrity at nano-scale during hydrogen charging.
International Journal of Hydrogen Energy
Vitenskapelig artikkel
-
Husby, Hans;
Iannuzzi, Mariano;
Johnsen, Roy;
Mariano, Kappes;
Barnoush, Afrooz.
(2018)
Effect of nickel on hydrogen permeation in ferritic/
pearlitic low alloy steels.
International Journal of Hydrogen Energy
Vitenskapelig artikkel
-
Wold, Kristian;
Johnsen, Roy;
Iannuzzi, Mariano;
Årtun, Lars.
(2018)
Integrated cathodic protection (CP) sensor network development of the CP sensor.
International Corrosion Conference Series
Vitenskapelig artikkel
-
Haugan, Eirik;
Næss, Monika;
Torres Rodriguez, Cristian;
Johnsen, Roy;
Iannuzzi, Mariano.
(2017)
Effect of tungsten on the pitting and crevice corrosion resistance of Type 25Cr super duplex stainless steels.
Corrosion
Vitenskapelig artikkel
-
Farhat, Hanan;
Johnsen, Roy.
(2017)
Hydrogen sulfide tube failure in a seawater heat exchanger.
Materials performance
Vitenskapelig artikkel
-
Krogstad, Hedda Nordby;
Skilbred, Ellen Synnøve;
Johnsen, Roy.
(2017)
Corrosion of nickel aluminium bronze - Effect of alloying elements and pH.
International Corrosion Conference Series
Vitenskapelig artikkel
-
Johnsen, Roy;
Nese, Ove.
(2017)
AA5083 and AA6082 exposed to seawater - Effect of potential on corrosion behaviour.
International Corrosion Conference Series
Vitenskapelig artikkel
-
Bernås, Mia;
Westermann, Ida;
Johnsen, Roy;
Lauritsen, Christian;
Iannuzzi, Mariano.
(2017)
Effect of microstructure on the corrosion resistance of duplex stainless steels: Materials performance maps.
International Corrosion Conference Series
Vitenskapelig artikkel
-
Krogstad, Hedda Nordby;
Johnsen, Roy;
Coey, M.
(2017)
Corrosion of nickel aluminium bronze - Effect of a uniform magnetic field.
International Corrosion Conference Series
Vitenskapelig artikkel
-
Quale, Geir;
Iannuzzi, Mariano;
Johnsen, Roy.
(2017)
Cathodic protection by distributed sacrificial anodes - A new cost-effective solution to prevent corrosion of subsea structures.
International Corrosion Conference Series
Vitenskapelig artikkel
-
Krogstad, Hedda Nordby;
Johnsen, Roy.
(2017)
Corrosion properties of nickel-aluminium bronze in natural seawater?Effect of galvanic coupling to UNS S31603.
Corrosion Science
Vitenskapelig artikkel
-
Stenerud, Gaute;
Johnsen, Roy;
Olsen, Jim Stian;
He, Jianying;
Barnoush, Afrooz.
(2017)
Effect of hydrogen on dislocation nucleation in alloy 718.
International Journal of Hydrogen Energy
Vitenskapelig artikkel
-
Iannuzzi, Mariano;
Barnoush, Afrooz;
Johnsen, Roy.
(2017)
Materials and corrosion trends in offshore and subsea oil and gas production.
npj Materials Degradation
Vitenskapelig artikkel
-
Kheradmand, Nousha;
Johnsen, Roy;
Olsen, Jim Stian;
Barnoush, Afrooz.
(2016)
Effect of Hydrogen on the hardness of different phases in super duplex stainless steel.
International Journal of Hydrogen Energy
Vitenskapelig artikkel
-
Lange, Torstein;
Bengtsson Blucher, Daniel;
Venkataraman, Shankar;
Jakobi, Dietinde;
Asteman, Henrik;
Johnsen, Roy.
(2016)
A new cast Ni-base alloy suitable for severe sour service.
International Corrosion Conference Series
Vitenskapelig artikkel
-
Næss, Monika;
Johnsen, Roy;
Haugan, Eirik Bjørge;
Iannuzzi, Mariano.
(2016)
Effect of tungsten on pitting and crevice corrosion of type 25Cr super duplex stainless steel.
International Corrosion Conference Series
Vitenskapelig artikkel
-
Stenerud, Gaute;
Johnsen, Roy;
Olsen, Jim Stian.
(2015)
Susceptibility to Hydrogen Induced Stress Cracking of UNS N07718 and UNS N07725 under cathodic polarization.
International Corrosion Conference Series
Vitenskapelig artikkel
-
Næss, Monika E;
Iannuzzi, Mariano;
Johnsen, Roy.
(2015)
Use of electrochemical techniques to determine the effect of sigma (σ)-phase precipitation on a 25 wt% CR super duplex stainless steel.
International Corrosion Conference Series
Vitenskapelig artikkel
-
Castberg, Tore Støren;
Johnsen, Roy;
Berget, J.
(2015)
Corrosion and subsequent erosion of hardmetals: Dependence of WC grain size and distribution, and binder composition.
Materials and corrosion - Werkstoffe und Korrosion
Vitenskapelig artikkel
-
Holager, Cathrine Selina;
Johnsen, Roy;
Nisancioglu, Kemal.
(2015)
Corrosion of thermally sprayed aluminum in flowing seawater.
International Corrosion Conference Series
Vitenskapelig artikkel
-
Olden, Vigdis;
Saai, Afaf;
Jemblie, Lise;
Johnsen, Roy.
(2014)
FE simulation of hydrogen diffusion in duplex stainless steel.
International Journal of Hydrogen Energy
Vitenskapelig artikkel
-
Baltzersen, Øystein;
Johnsen, Roy;
Martinussen, H;
Nerbø, Ingar Stian.
(2013)
Using permanently installed ultrasound monitoring to maximize the lifetime of a pipeline.
International Corrosion Conference Series
Vitenskapelig artikkel
-
Espallargas, Nuria;
Johnsen, Roy;
Torres, Christian Rodriguez;
Igual Munoz, Anna.
(2013)
A new experimental technique for quantifying the galvanic coupling effects on stainless steel during tribocorrosion under equilibrium conditions.
Wear
Vitenskapelig artikkel
-
Barnoush, Afrooz;
Asgari, Masoud;
Johnsen, Roy;
Hoel, Rune.
(2013)
Hydrogen Effect on Nanomechanical Properties of the Nitrided Steel.
Metallurgical and Materials Transactions A
Vitenskapelig artikkel
-
Asgari, Masoud;
S. Azar, Amin;
Barnoush, Afrooz;
Johnsen, Roy.
(2013)
Orientation Relationships and Texture of the Iron-Nitride Phase Constituents in Pulsed Plasma Nitriding.
Metallurgical and Materials Transactions A
Vitenskapelig artikkel
-
Asgari, Masoud;
Barnoush, Afrooz;
Johnsen, Roy;
Hoel, Rune.
(2013)
Small-scale structural and mechanical characterization of the nitrided layer in martensitic steel.
Tribology International
Vitenskapelig artikkel
-
Asgari, Masoud;
Johnsen, Roy;
Barnoush, Afrooz.
(2013)
Nanomechanical characterization of the hydrogen effect on pulsed plasma nitrided super duplex stainless steel.
International Journal of Hydrogen Energy
Vitenskapelig artikkel
-
Castberg, Tore Støren;
Johnsen, Roy;
Berget, John.
(2013)
Erosion of hardmetals: Dependence of WC grain size and distribution, and binder composition.
Wear
Vitenskapelig artikkel
-
Barnoush, Afrooz;
Asgari, Masoud;
Johnsen, Roy.
(2012)
Resolving the hydrogen effect on dislocation nucleation and mobility by electrochemical nanoindentation.
Scripta Materialia
Vitenskapelig artikkel
-
De Ridder, Karin;
Pape, Kristine;
Johnsen, Roy;
Westin, Steinar;
Holmen, Turid Lingaas;
Bjørngaard, Johan Håkon.
(2012)
Adolescent health is associated with high school dropout, independent of parental socioeconomic status: a prospective population study, The Young-HUNT 1 study (Norway).
European Journal of Public Health
Sammendrag/abstract
-
Asgari, Masoud;
Barnoush, Afrooz;
Johnsen, Roy;
Hoel, Rune.
(2012)
Nanomechanical evaluation of the protectiveness of nitrided layers against hydrogen embrittlement.
Corrosion Science
Vitenskapelig artikkel
-
Von der Ohe, Christian Bertil;
Johnsen, Roy;
Espallargas, Nuria.
(2012)
Multi-degradation behavior of austenitic and super duplex stainless steel - The effect of 4-point static and cyclic bending applied to a simulated seawater tribocorrosion system.
Wear
Vitenskapelig artikkel
-
Von der Ohe, Christian Bertil;
Johnsen, Roy;
Espallargas, Nuria.
(2011)
A multi-degradation test rig for studying the synergy effects of tribocorrosion interacting with 4-point static and cyclic bending.
Wear
Vitenskapelig artikkel
-
Asgari, Masoud;
Barnoush, Afrooz;
Johnsen, Roy;
Hoel, Rune.
(2011)
Microstructural characterization of pulsed plasma nitrided 316L stainless steel.
Materials Science & Engineering: A
Vitenskapelig artikkel
-
Rommetveit, Tarjei;
Johansen, Tonni Franke;
Johnsen, Roy.
(2011)
Using a multi-layered transducer model to estimate the properties of paraffin wax deposited on steel.
Ultrasonics
Vitenskapelig artikkel
-
von der Ohe, Christian B.;
Johnsen, Roy;
Espallargas, Nuria.
(2010)
Modeling the multi-degradation mechanisms of combined tribocorrosion interacting with static and cyclic loaded surfaces of passive metals exposed to seawater.
Wear
Vitenskapelig artikkel
-
Axelsen, Sten Bjarne;
Johnsen, Roy;
Knudsen, Ole Øystein.
(2010)
Mechanical Properties of Polysiloxane Topcoats.
Corrosion
Vitenskapelig artikkel
-
Rommetveit, Tarjei;
Johansen, Tonni Franke;
Johnsen, Roy.
(2010)
A Combined Approach for High-Resolution Corrosion Monitoring and Temperature Compensation Using Ultrasound.
IEEE Transactions on Instrumentation and Measurement
Vitenskapelig artikkel
-
Axelsen, Sten Bjarne;
Johnsen, Roy;
Knudsen, Ole Øystein.
(2010)
Internal Stress in Polysiloxane Topcoats.
Corrosion
Vitenskapelig artikkel
-
Axelsen, Sten Bjarne;
Sjaastad, A;
Knudsen, Ole Øystein;
Johnsen, Roy.
(2010)
Protective Coatings Offshore: Introducing a Risk-Based Maintenance Management System-Part 3: A Case Study.
Corrosion
Vitenskapelig artikkel
-
Axelsen, Sten Bjarne;
Knudsen, Ole Øystein;
Johnsen, Roy.
(2010)
Protective Coatings Offshore: Introducing a Risk-Based Maintenance Management System-Part 2: Framework Establishment.
Corrosion
Vitenskapelig artikkel
-
Laustad, Gro;
Johnsen, Roy;
Asbjørnsen, Ingvild;
Bjurstrøm, Martin;
Hjorth, C.G.
(2010)
Resistance Toward Hydrogen-Induced Stress Cracking of Hot Isostatically Pressed Duplex Stainles Steel under Cathodic Protection.
Corrosion
Vitenskapelig artikkel
-
Axelsen, Sten Bjarne;
Johnsen, Roy;
Knudsen, Ole Øystein.
(2010)
Adhesion Properties of Polysiloxane Topcoats.
Corrosion
Vitenskapelig artikkel
-
Axelsen, Sten Bjarne;
Knudsen, Ole Øystein;
Johnsen, Roy.
(2009)
Protective Coatings Offshore: Introducing a Risk-Based Maintenance Management System - Part 1: Risk Analysis Methodology.
Corrosion
Vitenskapelig artikkel
-
Olden, Vigdis;
Thaulow, Christian;
Johnsen, Roy;
Østby, Erling;
Berstad, Torodd.
(2009)
Influence of hydrogen from cathodic protection on the fracture susceptibility of 25%Cr duplex stainless steel - Constant load SENT testing and FE-modelling using hydrogen influenced cohesive zone elements.
Engineering Fracture Mechanics
Vitenskapelig artikkel
-
Olden, Vigdis;
Thaulow, Christian;
Johnsen, Roy;
Østby, Erling;
Berstad, Torodd.
(2008)
Application of hydrogen influenced cohesive laws in the prediction of hydrogen induced stress cracking in 25%Cr duplex stainless steel.
Engineering Fracture Mechanics
Vitenskapelig artikkel
-
Olden, Vigdis;
Thaulow, Christian;
Johnsen, Roy.
(2008)
Modelling of hydrogen diffusion and hydrogen induced cracking in supermartensitic and duplex stainless steels.
Materials & design
Vitenskapelig oversiktsartikkel/review
-
Okstad, Trine;
Rannestad, Øyvind;
Johnsen, Roy;
Nisancioglu, Kemal.
(2007)
Significance of hydrogen evolution during cathodic protection of carbon steel in Seawater.
Corrosion
Vitenskapelig artikkel
-
Olden, Vigdis;
Thaulow, Christian;
Johnsen, Roy;
Østby, Erling.
(2007)
Cohesive Zone Modeling of hydrogen-induced stress cracking in 25% Cr duplex stainless steel.
Scripta Materialia
Vitenskapelig artikkel
-
Johnsen, Roy;
Gjerding-Smith, Knut;
Lange, Hans Iver;
Leinum, Bente;
Gundersen, Gunnar;
Isaksen, Bjørn.
(2006)
Wire fracture in locked coil cables.
Bridge Structures - Assessment, Design and Construction
Vitenskapelig artikkel
Del av bok/rapport
-
Parow, Hanna;
Johnsen, Roy;
Skovhus, Torben Lund.
(2021)
MIC in the Fire Water Sprinkler System at St. Olavs Hospital, Trondheim, Norway.
CRC Press
Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
-
Perez Ramirez, Pedro Agustin;
Johnsen, Roy;
Utne, Ingrid Bouwer.
(2012)
Probabilistic condition assessment of aging equipment considering the effect of operating conditions and maintenance.
The American Society of Mechanical Engineers (ASME)
Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
-
Hörnlund, Erik;
Ersdal, Gerhard;
Hinderaker, Rolf H.;
Johnsen, Roy;
Sharp, John M..
(2011)
Material Issues in Ageing and Life Extension (OMAE2011-49363).
The American Society of Mechanical Engineers (ASME)
Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
-
Johnsen, Roy.
(2011)
Tribocorrosion in Marine Environments.
Woodhead Publishing Limited
Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
-
von der Ohe, Christian B.;
Johnsen, Roy;
Espallargas, Nuria.
(2009)
Hydraulic Cylinders for Offshore Splash Zone Operation: A Review of Piston Rod Failure Cases and Alternative Concepts.
Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
-
Johnsen, Roy;
Nyhus, Bård;
Wästberg, Stig.
(2009)
Hydrogen Embrittlement of Stainless Steels Under Cathodic Protection in Seawater - Presentation of a New Test Method.
Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
-
Johnsen, Roy.
(2007)
Experience with the use of copper alloys in seawater systems on the Norwegian Continental Shelf.
Woodhead Publishing Limited
Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
Rapport
-
Lu, Xu;
Kattuputhur Soundararajan, Chandrahaasan;
Wang, Dong;
Johnsen, Roy.
(2023)
Failure investigation of Alloy 725 drive screw.
Technical report
Rapport
-
Brataas, Arne;
Mathiesen, Ragnvald;
Grande, Tor;
Roven, Hans Jørgen;
Grepstad, Jostein;
Echtermeyer, Andreas.
(2013)
Enabling technologies at NTNU; materials science and engineering.
NTNU
Rapport
PRODUKT
-
Olden, Vigdis;
Johnsen, Roy;
Jemblie, Lise;
Hagen, Anette Brocks;
Hagen, Catalina Hoem Musinoi;
Zhang, Zhiliang.
(2023)
International Hydrogen and Materials Integrity Workshop 2023.
Annet produkt
Undervisning
Emner
- MM8455 - Eksperimentelle og modellerende tilnærminger innen overflateteknikk, korrosjon og tribologi
- MM8484 - Seminarserie for anvendte materialer
- TMM4560 - Produktutvikling og materialer, fordypningsprosjekt
- TMM4170 - Korrosjon
- TMM4205 - Tribologi og overflateteknikk
- TMT4255 - Korrosjon og korrosjonsbeskyttelse
- TMM4940 - Nanoteknologi, masteroppgave
- TMM4960 - Produktutvikling og materialer, masteroppgave
- TMM4550 - Nanoteknologi, fordypningsprosjekt
- TMM4540 - Industriell IKT produktutvikling og materialer, fordypningsprosjekt
- TMM4100 - Materialteknikk
- MAST2100 - Materialteknologi
- TMM4935 - Industriell IKT, masteroppgave
- MM8405 - Videregående tribologi og overflateteknikk
Formidling
2023
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Vitenskapelig foredragOlden, Vigdis; Alvaro, Antonio; Nyhus, Bård; Hagen, Anette Brocks; Johnsen, Roy; Di, Wan. (2023) Hydrogen embrittlement in subsea pipelines - From natural gas to hydrogen gas transport. Engineering Conferences International International Hydrogen Conference 2023 , Park City, Utah, USA 2023-09-17 - 2023-09-21
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Vitenskapelig foredragKoren, Erik Aas; Hagen, Catalina Hoem Musinoi; Wang, Dong; Lu, Xu; Johnsen, Roy; Yamabe, Junichiro. (2023) Hydrogen diffusion in X65 pipeline steels. SINTEF/NTNU/Kyushu University SNEAC - Environmental assisted cracking workshop , Trondheim 2023-06-06 - 2023-06-08
2022
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Vitenskapelig foredragJohnsen, Roy. (2022) Hydrogen uptake and embrittlement of X65 pipeline steel. Qatar Environment and Energy Research Institute (QEERI) Material Science day at Qatar Environment and Energy Research Institute (QEERI) , Doha, Qatar 2022-09-15 - 2022-09-15
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Faglig foredragJohnsen, Roy; Torres, Cristian; Skar, Jan-Ivar; Duparc, Marion; Hesjevik, Sven Morten. (2022) Determination of oxygen limits for corrosion resistant alloys (CRAs) in oil & gas produced water based on electrochemical test methods Part 1: Crevice corrosion and repassivation potentials without oxygen. Association for Materials Protection and Performance (AMPP) AMPP Corrosion , San Antonio, Texas 2022-03-06 - 2022-03-10
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Faglig foredragJohnsen, Roy; Salasi, Mobin; Iannizzi, Mariano; Andersen, Kjetil; Krosness, Ola. (2022) Calcareous deposition on thermally sprayed aluminum surfaces. Association for Materials Protection and Performance (AMPP) AMPP Corrosion , San Antonio, Texas 2022-03-05 - 2022-03-10
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Faglig foredragJohnsen, Roy; Duparc, Marion; Skar, Jan-Ivar; Saxegård, Tov Eivind. (2022) Determination of Oxygen Limits for Corrosion Resistant Alloys (CRAs) in Oil & Gas Produced Water Based on Electrochemical Test Methods – Part 2. Association for Materials Protection and Performance (AMPP) AMPP Corrosion , San Antonio, Texas 2022-03-05 - 2022-03-10
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Vitenskapelig foredragJohnsen, Roy; Djupvik, Veronika; Hartung, Cathrine; Qvale, Atle Helge; Westermann, Ida. (2022) The Susceptibility of Spheroidal Graphite Cast Iron to Hydrogen Induced Stress Cracking. Association for Materials Protection and Performance (AMPP) AMPP Corrosion , San Antonio, Texas 2022-03-06 - 2022-03-10
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Vitenskapelig foredragKoren, Erik Aas; Hagen, Catalina Hoem Musinoi; Wang, Dong; Lu, Xu; Johnsen, Roy; Yamabe, Junichiro. (2022) Experimental comparison of gaseous and electrochemical hydrogen charging in a X65 pipeline steel using the permeation technique. European Federation of Corrosion EUROCORR2022 , Berlin, Tyskland 2022-08-28 - 2022-09-01
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Vitenskapelig foredragKoren, Erik Aas; Hagen, Catalina Hoem Musinoi; Wang, Dong; Lu, Xu; Johnsen, Roy; Yamabe, Junichiro. (2022) Correlating electrochemical and gaseous hydrogen charging of a X65 pipeline steel by the permeation technique. European Structural Integrity Society ECF23, European Conference on Fracture 2022 , Madeira, Portugal 2022-06-27 - 2022-07-01
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Vitenskapelig foredragLu, Xu; Johnsen, Roy. (2022) Hydrogen diffusion and uptake in nickel Alloy 625 . Eurocorr Conference , Berlin 2022-08-28 - 2022-09-01
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Vitenskapelig foredragNyhus, Bård; Alvaro, Antonio; Myhre, Aleksander Omholt; Hagen, Anette Brocks; Wang, Dong; Koren, Erik Aas. (2022) Hydrogen-materials research on the influence of pressurized H2 gas on pipeline steel - Recent results from the HyLINE project. Norsk Petroleumsforening Subsea Pipelines & Cables , Trondheim 2022-10-11 - 2022-10-12
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Faglig foredragOlden, Vigdis; Vinogradov, Alexei; Johnsen, Roy; Zhang, Zhiliang; Alvaro, Antonio; Hagen, Catalina Hoem Musinoi. (2022) Hydrogen embrittlement resistance of X65 pipeline steel – recent results from the HyLINE project. Norsk Forening for vedlikehold Robust materialvalg i energisektoren , Quality Hotel Olavsgaard, Skjetten 2022-04-04 - 2022-04-05
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Vitenskapelig foredragOlden, Vigdis; Vinogradov, Alexei; Johnsen, Roy; Zhang, Zhiliang; Alvaro, Antonio; Hagen, Catalina Hoem Musinoi. (2022) Hydrogen embrittlement resistance of X65 pipeline steels - Results from the HyLINE project. HYDROGENIUS, I2CNER, HYDROMATE AND SINTEF HYDROGEN-MATERIALS INTERACTIONS - HYDROGENIUS, I2CNER, HYDROMATE AND SINTEF JOINT RESEARCH SYMPOSIUM 2022 , Fukuoka, Kyushu Universitet 2022-01-27 - 2022-01-28
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Vitenskapelig foredragLu, Xu; Johnsen, Roy. (2022) H-assisted failure in nickel alloys and possible mitigation approach. Swerim 4th Sweden hydrogen seminar 2022-10-27 - 2022-10-27
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Vitenskapelig foredragLu, Xu; Johnsen, Roy. (2022) Hydrogen diffusion and trapping in nickel Alloys 625 and 725. NTNU HEiNS symposium , Trondheim 2022-12-05 - 2022-12-06
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Vitenskapelig foredragLu, Xu; Johnsen, Roy. (2022) Hydrogen diffusion and uptake in nickel alloy 625. Nasjonal konferanse for materialteknologi , Oslo 2022-06-01 - 2022-06-02
2021
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Vitenskapelig foredragLu, Xu; Johnsen, Roy. (2021) Effect of temperature on hydrogen uptake in nickel alloy 625. Academic Seminar on the M-HEAT project 2021-10-12 - 2021-10-12
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Vitenskapelig foredragLu, Xu; Johnsen, Roy. (2021) Study on hydrogen trapping and diffusion in nickel alloys. NTNU Academic Seminar on the M-HEAT project , NTNU 2021-06-15 - 2021-06-15
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Vitenskapelig foredragLu, Xu; Johnsen, Roy. (2021) Evaluation of hydrogen diffusion behavior in nickel alloy 625. NTNU Academic Seminar on the M-HEAT project , NTNU 2021-03-23 - 2021-03-23
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Vitenskapelig foredragHagen, Catalina Hoem Musinoi; Knudsen, Ole Øystein; Johnsen, Roy; Pfleging, Wilhelm. (2021) Oxidation of coated steel during exposure to humid air and effects on cathodic disbonding. EUROCORR 2021 2021-09-20 - 2021-09-24
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Faglig foredragJohnsen, Roy; Eriksen, Kristian; Hauger, Stian. (2021) Welding of CRA with insufficient purging gas Impact on mechanical properties and corrosion resistance. NACE International/AMMP NACE Corrosion 2021 , Salt Lake City, USA 2021-04-19 - 2022-01-30
2017
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Vitenskapelig foredragJohnsen, Roy. (2017) Hydrogen Induced Stress Cracking of Stainless Steel in Seawater – what do we know and what is still unknown?. European Federation of Corrosion EUROCORR 2017 , Praha 2017-07-03 - 2017-07-07
2016
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Vitenskapelig foredragJohnsen, Roy. (2016) Hydrogen Induced Stress Cracking of Duplex Stainless Steel under Cathodic Protection in Seawater – Historical overview and Lessons Learned. ACerS, AIST, ASM International, TMS, NACE International Material Science & TEchnology 2016 , Salt Lake City 2016-10-23 - 2016-10-27
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Vitenskapelig foredragBengtsson Blucher, Daniel; Lange, Torstein; Venkataraman, Shankar; Asteman, Henrik; Jakobi, Dietlinde; Johnsen, Roy. (2016) A new centrifugally cast austenitic Ni-base alloy suitable for severe sour service heavy wall thickness piping application. EUROCORR 2016 2016-09-11 - 2016-09-15
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Vitenskapelig foredragVenkataraman, Shankar; Bengtsson Blucher, Daniel; Jakobi, Dietinde; Asteman, Dr. Henrik; Johnsen, Roy; Lange, Torstein. (2016) A New Cast Ni-Base Alloy Suitable for Severe Sour Service. Nace International NACE International Corrosion 2016 Conference & Expo , Vancouver 2016-03-06 - 2016-03-10
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Vitenskapelig foredragKrogstad, Hedda Nordby; Johnsen, Roy. (2016) The effect of a Magnetic Field on the Galvanic corrosion of NiAlBronze in Natural Seawater. NACE International NACE International Corrosion 2016 Conference & Expo , Vancouver 2016-03-06 - 2016-06-10
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Vitenskapelig foredragJohnsen, Roy; Iannuzzi, Mariano; Haugan, Eirik; Næss, Monika E. (2016) Effect of Tungsten on Pitting and Crevice Corrosion of type 25Cr Super Duplex Stainless Steel. NACE International NACE International Corrosion 2016 Conference & Expo , Vancouver 2016-03-06 - 2016-03-10
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Faglig foredragJohnsen, Roy; Iannuzzi, Mariano. (2016) Distributed Sacrificial Anode (DSA) – a new cost effective solution for corrosion protection of structures in seawater . Norsk Korrosjonsteknisk Forening, Stavanger avdeling Materialdagen , Stavanger 2016-06-02 - 2016-06-03
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Vitenskapelig foredragBernås, Mia; Westermann, Ida; Johnsen, Roy; Iannuzzi, Mariano. (2016) Microstructural evolution during isothermal heat treatment of a W-rich super duplex stainless steel. Norsk Materialteknisk Selskap/Norsk Metallografisk Forening Nasjonal Konferanse for Materialteknologi , Trondheim 2016-08-24 - 2016-08-25
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Vitenskapelig foredragJohnsen, Roy; Stenerud, Gaute; Barnoush, Afrooz; Olsen, Jim Stian. (2016) In Situ Electrochemical Nanoindentation of Alloy 718. European Federation of Corrosion EUROCORR 2016 , Montpellier 2016-09-11 - 2016-09-15
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Vitenskapelig foredragJohnsen, Roy; husby, hans; Barnoush, Afrooz; Iannuzzi, Mariano. (2016) Effect of nickel in solid solution on hydrogen transport kinetics in low alloy steels. European Federation of Corrosion EUROCORR/16 , Montpellier 2016-09-11 - 2016-09-15
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Vitenskapelig foredragOlden, Vigdis; Johnsen, Roy; Zhang, Zhiliang. (2016) Hydrogen induced stress cracking (HISC) . SINTEF og NTNU SINTEF and NTNU's Environmental Assisted Cracking workshop - SNEAC , Trondheim 2016-06-08 - 2016-06-10
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Vitenskapelig foredragJohnsen, Roy; Lange, Torstein; Olsen, Jim Stian. (2016) Susceptibility to hydrogen embrittlement for C72900 exposed to H2S environment and under cathodic polarization in simulated seawater. European Federation of Corrosion EUROCORR 2016 , Montpellier 2016-09-11 - 2016-09-15
2015
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Vitenskapelig foredragIannuzzi, Mariano; Johnsen, Roy; Næss, Monika E. (2015) Use of electrochemical techniques to determine the degree of σ-phase precipitation in Type 25Cr SDSS. NACE International CORROSION/15 , Dallas 2015-03-16 - 2015-03-19
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Vitenskapelig foredragIannuzzi, Mariano; Johnsen, Roy; Næss, Monika E. (2015) Use of electrochemical techniques to determine localized corrosion resistance of 25-wt% Cr Super Duplex Stainless Steels. Norwegian Corrosion Society 16th Nordic Corrosion Congress , Stavanger 2015-05-20 - 2015-05-22
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Vitenskapelig foredragHolager, Cathrine Selina; Johnsen, Roy; Nisancioglu, Kemal. (2015) Corrosion of Thermally Sprayed Aluminum in Flowing Seawater. NACE International NACE Corrosion 2015 , Dallas, Texas 2015-03-15 - 2015-03-19
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Faglig foredragKheradmand, Nousha; Hajilou, Tarlan; Deng, Yun; Johnsen, Roy; Barnoush, Afrooz. (2015) In situ electrochemical-micro-compression test: An investigation of dislocation-grain boundary interaction in presence of hydrogen. TMS 2015, 144th Annual Meeting and Exhibition 2015-03-15 - 2015-03-19
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Faglig foredragKheradmand, Nousha; Johnsen, Roy; Barnoush, Afrooz. (2015) Hydrogen Embrittlement in Advanced Materials for Oil and Gas Industry: A Nanomechanical Approach. TMS 2015, 144th Annual Meeting and Exhibition 2015-03-15 - 2015-03-19
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Vitenskapelig foredragJohnsen, Roy. (2015) Corrosion Challenges for the oil and gas industry in the State of Qatar. TMS TMS Middle East – Mediterranean Materials Congress and Energy and Infrastructure Systems (MEMA 2015). , Doha 2015-01-11 - 2015-01-14
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Vitenskapelig foredragJohnsen, Roy. (2015) Corrosion and hydrogen embrittlement in production systems – effect on process safety. College of North Atlantic Qatar Qatar Process Safety Symposium “Successfully Managing Changes for a safer future , Doha 2015-03-30 - 2015-03-31
2014
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Vitenskapelig foredragAndersen, Kjetil; Johnsen, Roy; Olsen, Jim Stian. (2014) Effect of grain size on HISC resistance in 25% Cr super duplex stainless steels. ESIS EFC20 , TRONDHEIM 2014-06-30 - 2014-07-04
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Vitenskapelig foredragOlden, Vigdis; Saai, Afaf; Jemblie, Lise; Johnsen, Roy. (2014) A finite element study of hydrogen diffusion in duplex stainless steel. Lode Duprez, Department Manager Metallurgy at OCAS, Zelzate Steel & Hydrogen Conference 2014 , Gent 2014-05-05 - 2014-05-07
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Vitenskapelig foredragJohnsen, Roy. (2014) Hydrogen embrittlement of corrosion resistant alloys in oil/gas environment. Texas A&M Qatar Oryx GTL Excellence Series in Chemical Engineering , Doha 2014-02-18 - 2014-02-18
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Vitenskapelig foredragHolager, Cathrine Selina; Johnsen, Roy; Nisancioglu, Kemal. (2014) Corrosion of Thermally Sprayed Aluminium in Flowing Seawater. European Federation of Chemical Engineering 10th European Symposium on Electrochemical Engineering , Cagliari 2014-09-28 - 2014-10-02
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Vitenskapelig foredragWesmann, Johan Andre; Johnsen, Roy; Espallargas, Nuria; Herland, j; Twist, Dag; Araki, H. (2014) Investigation of oxide formation on sliding interfaces of WC-CoCr in relation to friction and wear. Foredrag - proceedings 2014-05-21 - 2014-05-23
2013
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Vitenskapelig foredragLange, Hans Iver; Johnsen, Roy; Gundersen, Gunnar. (2013) Sensitivity for fracture from defects in wires of bridge suspension cables. The 8th International cable supported bridge operators' conference, Edinburgh, Scotland 2013-06-03 - 2013-06-05
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Vitenskapelig foredragWesmann, Johan Andre; Twist, Dag; Johnsen, Roy; Espallargas, Nuria. (2013) Friction and wear of coatings for subsea valves. International Thermal Spray Conference 2013 2013-05-13 - 2013-05-15
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Vitenskapelig foredragWesmann, Johan Andre; Herland, j; Twist, Dag; Johnsen, Roy; Espallargas, Nuria. (2013) Influence of environmental conditions on friction of WC-CoCr coatings. World Tribology Conference 2013 2013-09-08 - 2013-09-13
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Vitenskapelig foredragWesmann, Johan Andre; Herland, j; Twist, Dag; Johnsen, Roy; Espallargas, Nuria. (2013) FRICTION EVOLUTION OF WC-CoCr THERMALLY SPRAYED COATINGS DURING DRY SLIDING IN DIFFERENT ENVIRONMENTS. International Tribology Symposium of IFToMM 2013-03-19 - 2013-03-21
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Vitenskapelig foredragBarnoush, Afrooz; Zamanzade, Mohammad; Asgari, Masoud; Johnsen, Roy; Vehoff, Horst. (2013) Hydrogen embrittlement revisited by novel nanomechanical approach. German physic society (DPG) DPG Spring Meeting of the Condensed Matter Section , Regensburg 2013-03-10 - 2013-03-15
2012
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Vitenskapelig foredragEspallargas, Nuria; von der Ohe, Christian B.; Johnsen, Roy. (2012) Effect of fatigue on tribocorrosion of passive materials used in offshore drilling applications – new test rig combining cyclic/static bending and tribocorrosion. foredrag 2012-04-19 - 2012-04-20
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Vitenskapelig foredragPerez Ramirez, Pedro Agustin; Johnsen, Roy; Utne, Ingrid Bouwer. (2012) Probabilistic condition assessment of aging equipment considering the effect of operating conditions and maintenance. 31st International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2012) , Rio de Janeiro 2012-07-01 - 2012-07-06
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Vitenskapelig foredragJohnsen, Roy. (2012) Hydrogen embrittlement of carbon steel and stainless steel. Qatar University and Texas A&M Materials and Science Engineering Symposium 2012 , Doha 2012-02-28 - 2012-02-28
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Populærvitenskapelig foredragJohnsen, Roy. (2012) Corrosion and corrosion fatigue properties of aluminium components – Focus on oil & gas. Qatar University Aluminium Workshop , Doha 2012-05-12 - 2012-05-12
2011
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Vitenskapelig foredragJohnsen, Roy. (2011) Replacement of "Hard Chrome" with HVOF on piston rods for offshore hydraulic sylinders. Svetskommissionen Nordic Conference on Thermal Spraying , Trollhättan 2011-04-13 - 2011-04-14
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PosterAsgari, Masoud; Barnoush, Afrooz; Johnsen, Roy; Hoel, Rune. (2011) Effect of In-situ Hydrogen Charging on the Pulsed Plasma Nitriding Layer in Stainless steel. Engineering Conferences International (ECI 2011) Nanomechanical Testing in Materials Research and Development , Lanzarote, Canary Islands 2011-10-09 - 2011-10-14
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Vitenskapelig foredragBjørnsdotter, Marte; Holme, Caroline; Johnsen, Roy; Nisancioglu, Kemal. (2011) A simple approach for measuring slow rates of hydrogen entrainment and diffusion in metals. The Electrochemical Society 220th ECS Meeting , Boston 2011-10-09 - 2011-10-14
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Vitenskapelig foredragBjørnsdotter, Marte; Holme, Caroline; Johnsen, Roy; Nisancioglu, Kemal. (2011) A simple electrochemical engineering approach for measuring very slow rates of hydrogen entrainment and diffusion in metals. The european federation of chemical engineering 9th ESEE (European Symposium on Electrochemical Engineering) 2011 , Chania, Kreta 2011-06-19 - 2011-06-23
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Vitenskapelig foredragBjørnsdotter, Marte; Johnsen, Roy; Nisancioglu, Kemal. (2011) A simple method for measuring hydrogen entrainment and diffusion in stainless steel. European Federation of Corrosion Eurocorr (The European Corrosion Congress) 2011 , Stockholm 2011-09-04 - 2011-09-08
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Vitenskapelig foredragMubarok, Fahmi; Puranen, Jouni; Vuoristo, Petri; Johnsen, Roy; Espallargas, Nuria. (2011) Effect of suspension characteristics on microstructure of suspension plasma sprayed SiC submicron coatings. DVS – German Welding Society, ASM International International Thermal Spray Conference 2011 , Hamburg 2011-09-27 - 2011-09-29
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Vitenskapelig foredragJohnsen, Roy; Espallargas, Nuria; von der Ohe, Christian B.. (2011) The effect of cyclic and static tensile stresses on the tribocorrosion behavior of austenitic and duplex stainless steels in marine environment. NACE Corrosion 2011 , Houston 2011-03-13 - 2011-03-17
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Vitenskapelig foredragJohnsen, Roy; Nyhus, B.; Kongsten, O.E.. (2011) Susceptibility of hydrogen induced stress cracking of duplex stainless steel at elevated temperature. NACE Corrosion 2011 , Houston 2011-03-13 - 2011-03-17
2010
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Vitenskapelig foredragSkjellerudsveen, Magnus; Akselsen, Odd Magne; Olden, Vigdis; Johnsen, Roy. (2010) Effect of microstructure and temperature on hydrogen diffusion and trapping in X70 pipeline steel and its weldments. Dechema EuroCorr 2010 , Moskva 2010-09-13 - 2010-09-17
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Populærvitenskapelig foredragJohnsen, Roy. (2010) Thirty Years Experience with the use of stainless steels on the Norwegian Continental Shelf. Swerea/KIMAB 21st Seminar on Stainless Steel May 19th 2010 , Stockholm 2010-05-19 - 2010-05-19
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Populærvitenskapelig foredragJohnsen, Roy. (2010) Kan termisk sprøyting erstatte ”forkromming” på komponenter offshore?. Korrosjonsteknisk Forening, Bergen / Overflateteknikk Overflate 2010 , Bergen 2010-11-10 - 2010-11-11
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Populærvitenskapelig foredragJohnsen, Roy. (2010) Corrosion related problems on the Norwegian Continental Shelf - Topside and subsea. Petronas, Pertrad and Intsok Workshop on Corrosion Management , Kuala Lumpur 2010-01-26 - 2010-01-27
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Vitenskapelig foredragJohnsen, Roy; Nisancioglu, Kemal. (2010) INFLUENCE OF TEMPERATURE AND HYDROSTATIC PRESSURE ON HYDROGEN DIFFUSIVITY AND PERMEABILITY IN 13%Cr SUPER MARTENSITIC STAINLESS STEEL UNDER CATHODIC PROTECTION. NACE NACE Corrosion 2010 , San Antonio, Texas 2010-03-13 - 2010-03-17
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Vitenskapelig foredragSmirnova, Anna; Johnsen, Roy; Nisancioglu, Kemal. (2010) Effect of tensile stress on hydrogen permeation in 13% Cr super martensitic stainless steel. Dechema EuroCorr 2010 , Moskva 2010-09-13 - 2010-09-17
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Populærvitenskapelig foredragJohnsen, Roy. (2010) Improved corrosion protection of topside structures by thermal spraying. Petronas, Pertrad and Intsok Workshop on Corrosion Management , Kuala Lumpur 2010-01-26 - 2010-01-27
2009
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Vitenskapelig foredragJohnsen, Roy; Stangeland, Helga Wiig. (2009) Cathodic Protection in Cold Seawater - current density requirements. NACE International Corrosion 2009 , Atlanta, Georgia 2009-03-22 - 2009-03-26
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Vitenskapelig foredragJohnsen, Roy; Nyhus, Bård; Kongstein, Ole Edvard. (2009) Effect of temperature on Hydrogen Induced Stress Cracking (HISC) of UNS S32750 under cathodic protection in seawater. European Federation of Corrosion EUROCORR 2009 , NICE 2009-09-07 - 2009-09-10
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Vitenskapelig foredragBjørgum, Astrid Jørgine; Knudsen, Ole Øystein; Johnsen, Roy. (2009) Zinc rich primers - Effect of zinc loading. European Ferderation of Corrosion EUROCORR 2009 , Nice 2009-09-07 - 2009-09-10
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Vitenskapelig foredragSmirnova, Anna; Johnsen, Roy; Nisancioglu, Kemal. (2009) The influence of calcareous deposit on hydrogen uptake in 13% Cr super martensittic stainles steel under cathodic protection. European Federation of Corrosion EUROCORR 2009 , Nice 2009-09-07 - 2009-09-10
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Vitenskapelig foredragJohnsen, Roy. (2009) Hydraulic piston rods for hash environment - Can 25% Cr super duplex stainless steel be the preffered material?. ATI Wah Chang Corrosion Solution 2009 7th International Conference , Park City - Utah 2009-09-20 - 2010-09-24
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Vitenskapelig foredragEspallargas, Nuria; Johnsen, Roy; von der Ohe, Christian B.. (2009) Tribocorrosion properties of super duplex stainless steel in 3.4% NaCl and H2SO4 0.5M solution. European Federation of Corrosion EUROCORR 2009 , Nice 2009-09-07 - 2009-09-10
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Vitenskapelig foredragJohnsen, Roy; Vingsand, Håvard. (2009) Corrosion properties of UNS S32750, UNS N06022 and UNS N10276 in seawater. NACE International Corrosion 2009 , Atlanta 2009-03-22 - 2009-03-26
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Vitenskapelig foredragRommetveit, Tarjei; Johnsen, Roy; Johansen, Tonni Franke; Baltzersen, Øystein. (2009) High resolution ultrasound thickness measurements through polyester coating and real-time process control. NACE International Corrosion 2009 , Atlanta 2009-03-22 - 2009-03-26
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Vitenskapelig foredragSmirnova, Anna; Johnsen, Roy; Nisancioglu, Kemal. (2009) Influence of calcareous deposits on hydrogen uptake in 13% Cr super martensitic stainless steel under cathodic protection. EuroCorr2009 2009-09-06 - 2009-09-10
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Vitenskapelig foredragvon der Ohe, Christian B.; Johnsen, Roy; Espallargas, Nuria. (2009) Premature failure of riser tensioner piston rods exposed to offshore splash zone operation – status and review of critical multi-degradation factors. NACE International Corrosion 2009 , Atlanta 2009-03-22 - 2009-03-26
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Vitenskapelig foredragAxelsen, Sten Bjarne; Johnsen, Roy; Knudsen, Ole Øystein. (2009) Protective Coatings Offshore: Introducing a risk based maintenance management system. NACE International Corrosion 2009 , Atlanta 2009-03-22 - 2009-03-26
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PosterSmirnova, Anna; Johnsen, Roy. (2009) New equipment for studying hydrogen diffusion in metals under varying temperature, stress/strain and hydrostatic pressure. EuroCorr2009 2009-09-06 - 2009-09-10
2008
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Vitenskapelig foredragRommetveit, Tarjei; Johnsen, Roy; Baltzersen, Øystein. (2008) Using ultrasound measurements for real-time process control of pipelines and process equipment subjected to corrosion and/or erosion. NACE International Corrosion 2008 , New Orleans 2008-03-16 - 2008-03-20
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Vitenskapelig foredragOkstad, Trine; Rannestad, Øyvind; Johnsen, Roy; Nisancioglu, Kemal. (2008) Significance of hydrogen evolution in cathodic protection of steel in seawater. Izmir University XI. International Corrosion Symposium (KORSEM08) , Izmir 2008-10-22 - 2008-10-25
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Vitenskapelig foredragOlden, Vigdis; Thaulow, Christian; Johnsen, Roy; Østby, Erling; Berstad, Torodd; Nyhus, Bård. (2008) Influence of hydrogen from CP on the fracture susceptibility of 25% Cr duplex stainless steel - FE modeling of constant load testing using hydrogen influenced cohesive zone elements. ISOPE 2008 , Vancouver 2008-07-06 - 2008-07-11
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Vitenskapelig foredragEspallargas, Nuria; Johnsen, Roy; Lunde, Lars; Berget, Jon. (2008) Coatings for use in Telescopic Joint used in Workover riser systems. Eurocorr 2008 , Edinburgh 2008-09-07 - 2008-09-11
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Vitenskapelig foredragAxelsen, Sten Bjarne; Røsseland, T.; Johnsen, Roy; Knudsen, Ole Øystein. (2008) Topcoat flaking - A mechanism study. NACE Corrosion 2008 , New Orleans 2008-03-16 - 2008-03-20
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Vitenskapelig foredragOlden, Vigdis; Thaulow, Christian; Johnsen, Roy. (2008) FE modeling of hydrogen induced stress cracking in 25% Cr duplex stainless steel. 2008 International Hydrogen Conference , Jackson Lake Lodge, Grand Teton National Park, Wyoming 2008-09-07 - 2008-09-10
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Vitenskapelig foredragJohnsen, Roy; Nyhus, Bård; Wästberg, Stig. (2008) HISC testing of stainless steels under cathodic protection in seawater. Aurocorr 2008 , Edinburgh 2008-09-07 - 2008-09-11
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Vitenskapelig foredragJohnsen, Roy; Vingsand, Håvard. (2008) Comparion of corrosion properties of UNS S32750, UNS N06022 and UNS N10276 in seawater. Eurocorr 2008 , Edinburgh 2008-09-07 - 2008-09-11
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Vitenskapelig foredragJohnsen, Roy. (2008) Hydrogensprøhet for materialer i sjøvann - hva vet vi?. Norsk Forening for Vedlikehold Oppshore Prosessanlegg og Rørledninger , Bergen 2008-10-21 - 2008-10-22
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Vitenskapelig foredragJohnsen, Roy. (2008) HISC testing of stainless components in seawater under cathodic protection. National Physical laboratory FESI-NPL Workshop "How best to qualify a material for resistance to hydrogen assisted cracking? , Teddington 2008-02-12 - 2008-02-12
2007
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Vitenskapelig foredragJohnsen, Roy; Okstad, Trine; Nicansioglu, Kemal; Rannestad, Øyvind. (2007) Significance of hydrogen evolution during cathodic protection. NACE International NACE Corrosion 2007 , Nashville, TN 2007-03-11 - 2007-03-15
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Vitenskapelig foredragLauvstad, Gro Ø.; Johnsen, Roy; Nyhus, Bård. (2007) Improved resistance towards hydrogen induced stress cracking (HISC) of hot isostatically pressed (HIP) duplex stainless steels under cathodic protection. NACE International NACE Corrosion 2007 , Nashville, TN 2007-03-11 - 2007-03-15
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Vitenskapelig foredragLauvstad, Gro Ø.; Johnsen, Roy; Borch, Øyvind; Da Silva, Erik Falck; Walmsley, John C. (2007) Breakdown in passivity of austenitic stainless steels in Cl- and H2S - modeling and characterization of the pit initiation process. NACE International NACE Corrosion 2007 , Nashville, TN 2007-03-11 - 2007-03-15
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Vitenskapelig foredragJohnsen, Roy; Baltzersen, Øystein; Waag, Tor Inge; Ahlén, Carl Henrik; Tveit, Edd. (2007) Wall thickness monitoring of new and existing subsea pipelines using ultrasound. NACE International NACE Corrosion 2007 , Nashville, TX 2007-03-11 - 2007-03-15
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Vitenskapelig foredragJohnsen, Roy. (2007) Cathodic protection in natural seawater - current practice and effect on probability of hydrogen induced stress cracking. European Federation of Corrosion Event No. 289 Konferanse , Freiburg im Breisgau 2007-09-09 - 2007-09-13
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Vitenskapelig foredragJohnsen, Roy; Bjørgum, Astrid Jørgine; Knudsen, Ole Øystein; Kvernbråten, Ann-Karin. (2007) Bare steel maintenance offshore - effect of different mechanical pre-treatment methods. European Federation of Corrosion Event No. 289 Eurocorr 2007 , Freiburg im Breisgau 2007-09-09 - 2007-09-13
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Vitenskapelig foredragBjørgum, Astrid Jørgine; Johnsen, Roy; Knudsen, Ole Øystein; Kvernbråten, Ann-Karin. (2007) Repair coating systems for bare steel: Effect of pre-treatment and conditions during application and curing. NACE International NACE Corrosion 2007 , Nashville, TN 2007-03-11 - 2007-03-15
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Vitenskapelig foredragKnudsen, Ole Øystein; Johnsen, Roy; Bjørgum, Astrid Jørgine; Polanco-Loria, Mario A.; Øyen, Anne. (2007) Internal stress and mechanical properties of pant films. NACE International NACE Corrosion 2007 , Nashville, TN 2007-03-11 - 2007-03-15
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Vitenskapelig foredragJohnsen, Roy; Berget, John; Nilsen, Tonelill. (2007) Influence of porosity on corrosion properties of thermally sprayed coatings. NACE International NACE Corrosion 2007 , Nashville, TN 2007-03-11 - 2007-03-15
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Vitenskapelig foredragJohnsen, Roy; Nyhus, Bård; Wästberg, Stig; Lauvstad, Gro Ø.. (2007) New improved method for HISC testing of stainless steels under cathodic protection. NACE International NACE Corrosion 2007 , Nashville, TN 2007-03-11 - 2007-03-15
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Vitenskapelig foredragSmirnova, Anna; Johnsen, Roy. (2007) Hydrogen Permeation in Super Martensitic and Duplex Stainless Steels under Cathodic Charging and Exposed to Artificial Seawater and 3.5% NaCl Solution. EuroCorr 2007 , Freiburg 2007-09-09 - 2007-09-13
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Vitenskapelig foredragJohnsen, Roy; Lauvstad, Gro Ø.; Asbjørnsen, Ingvild; Bjurstrøm, Martin; Hjort, Carl Gustav. (2007) The resistance towards hydrogen induced stress cracking (HISC) of hot isostatically pressed (HIP) duplex stainless steels under cathodic protection. European Federation of Corrosion Event No. 289 Eurocorr 2007 , Freiburg im Breisgau 2007-09-09 - 2009-09-13
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Vitenskapelig foredragBaltzersen, Øystein; Waag, Tor Inge; Johnsen, Roy; Ahlén, Carl Henrik; Tveit, Edd. (2007) Wall Thickness Monitoring of new and existing subsea pipelines using ultrasound. NACE NACE Corrosion 2007-01-01 - 2007-02-01
2006
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Vitenskapelig foredragJohnsen, Roy; Berget, John; Rogne, Trond. (2006) Improved Corrosion Resistance of HVOF sprayed ceramic-metallic coatings. International Association of Corrosion Engineers NACE CORROSION2006 , San Diego 2006-03-12 - 2006-03-16
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Vitenskapelig foredragJohnsen, Roy. (2006) Korrosjonstekniske utfordringer i oljeindustrien. Norsk Forening for Vedlikerhold Årsmøte i Norsk Forening for Vedlikehold , Molde 2006-05-10 - 2006-05-11
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Vitenskapelig foredragJohnsen, Roy; Nilsen, Anders Calder. (2006) Cathodic Protection of FPSO's - Current density requirements at potentials more negative than -1000 mV Ag/AgCl. Intenational Association of Corrosion Engineers NACE CORROSION 2006 , San Diego 2006-03-12 - 2006-03-16
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Vitenskapelig foredragJohnsen, Roy; Knudsen, Ole Øystein; Bjørgum, Astrid Jørgine; Frydenberg, Tone. (2006) Development of internal stress in organic coatings during curing and exposure. Intarnational Accosiation of Corrosion Engineers NACE CORROSION2006 , San Diego 2006-03-12 - 2006-03-16
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Vitenskapelig foredragJohnsen, Roy; Mikkelsen, Andre; Wästberg, Stig; Nyhus, Bård; Rogne, Trond. (2006) Influence of ambient pressure on Hydrogen Induced Stress Cracking (HISC) of Duplex Stainless Steels under Cathodic Protection. International Association of Corrosion Engineers NACE CORROSION 2006 , San Diego 2006-03-12 - 2006-03-16
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Populærvitenskapelig foredragJohnsen, Roy. (2006) Hva er korrosjon?. Tekniske Foreningers Servicekontor Strategisk Inspeksjonsstyring , Stavanger 2006-04-25 - 2006-04-26
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Populærvitenskapelig foredragJohnsen, Roy. (2006) Belegg for hydrauliske sylindere i marint miljø - Erfaringer og fremtidig behov. Norges Forskningsråd og Sveiseteknisk Forening Materialdagen , Stavanger 2006-10-25 - 2006-10-25
2005
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Vitenskapelig foredragJohnsen, Roy. (2005) HISC - Problemstillinger og utfordringer. Stålmat / Norsk Sveiseteknisk Forening Materialdagen 2005 , Stavanger 2005-10-26 - 2005-10-26
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Vitenskapelig foredragJohnsen, Roy. (2005) A New Multichannel Ultrasonic System for Subsea Corrosion amd Erosion Monitoring. NACE International CORROSION'2005 , Houston TX 2005-04-03 - 2005-04-07
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Vitenskapelig foredragJohnsen, Roy. (2005) Hydrogen Induced Stress Cracking of Stainless Steels. European Federation of Corrosion (EFC) EUROCORR'2005 , Lisboa 2005-09-05 - 2005-09-08
2004
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Vitenskapelig foredragJohnsen, Roy. (2004) Experience with the use of Copper Alloys in seawater systems in the Norwegian Sector of the North Sea. European Federation of Corrosion Eurocorr 2004 , NICE 2004-09-12 - 2004-09-16
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Populærvitenskapelig foredragJohnsen, Roy. (2004) Robuste beleggsystem for offshore konstruksjoner. Norsk Korrosjonsteknisk Forening - Avd. Stavanger Bransjeseminar Materialer og Belegg , Stavanger 2004-05-25 - 2004-05-26
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Populærvitenskapelig foredragJohnsen, Roy. (2004) Malingsvedlikehold - Verktøy for planlegging og utførelse. Teknologisk Institutt Overflatedagene 2004 , Oslo 2004-11-08 - 2004-11-10
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Populærvitenskapelig foredragJohnsen, Roy. (2004) Korrosjonsproblem i offshore industrien - Hva har vi lært?. Stålmat (NFR) Materialdagen 2004 , Stavanger 2004-10-27 - 2004-10-27