2026-06-30T01:11:26Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/83512024-04-12T11:43:11Zcom_10259_4201com_10259_5086com_10259_2604col_10259_4505

Lu, Xu Díaz Portugal, Andrés Ma, Jun Wang, Dong He, Jianying Zhang, Zhiliang Johnsen, Roy 2024-01-16T09:04:45Z 2024-01-16T09:04:45Z 2023-03 1359-6462 http://hdl.handle.net/10259/8351 10.1016/j.scriptamat.2022.115210 Recently, several hydrogen-assisted failures have been reported on different nickel alloys used in the subsea oil and gas industries. It is thus essential to correlate hydrogen uptake and diffusion behavior with stress conditions for an in-depth understanding of the failures. This study reports the first-hand finding on hydrogen diffusion behavior in a nickel Alloy 625 under different pre-strain levels by combining the electrochemical permeation test and diffusion model, with a particular focus on the effect of grain boundary carbide. As the multiplication of dislocations was claimed to trap hydrogen atoms and reduce the diffusivity by increasing the strain levels from 0.05 to 0.2, an acceleration in hydrogen diffusivity was however observed when the strain was higher than 0.1. This phenomenon was deduced to be caused by the diffusion highways by the hydrogen-enhanced strain-induced vacancy formation at the grain boundaries and reduced hydrogen trapping by the fractured carbides. The authors acknowledge the financial support from the Research Council of Norway through the project M-HEAT (294689) and the industry companies in the project. The Research Council of Norway is acknowledged for the support to the Norwegian Micro- and Nano-Fabrication Facility, NorFab, project number 295864. A. Díaz gratefully acknowledges the financial support from the Junta of Castile and Leon through grant BU-002-P20, co-financed by FEDER funds, and wishes to thank the Nanomechanical Lab of NTNU for providing hospitality during his research stay. application/pdf eng Elsevier Scripta Materialia. 2023, V. 226, 115210 https://doi.org/10.1016/j.scriptamat.2022.115210 Atribución 4.0 Internacional http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess Nickel alloy 625 Hydrogen Diffusion Plastic deformation Permeation Ingeniería civil Resistencia de materiales Civil engineering Strength of materials The effect of plastic deformation on hydrogen diffusion in nickel Alloy 625 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Scripta Materialia 226