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The evaluation of hydrogen's impact on key variables of dislocation structures—such as scale and boundary thickness/misorientation—in Fe-Ni-Cr austenitic steels offers deeper insight into the influence of hydrogen on deformation behavior. This understanding can aid in designing steels with enhanced resistance to hydrogen embrittlement. In this study, we examined the interplay among hydrogen, dislocation structure, strain hardening, and strain localization in a Fe-19Ni-24Cr (wt. %) austenitic steel through quantitative dislocation structure analysis. The evaluation of strain hardening by a dislocation-structure-based statistical model clarifies the individual roles of dislocation cells, cell blocks, and dense dislocation walls in the hardening process. We find that the impact of elastic shielding on key variables of dislocation structure and the hardening parameter associated with dislocation-forest hardening is limited, leading to only slight variations in hardening mechanisms. The hardening mechanism most dependent on hydrogen is solid-solution strengthening. Additionally, this study uncovers several hydrogen-related effects associated with the activation of secondary dislocation structures and strain localization at cell block boundaries, proposing a dislocation-based model that correlates the observed phenomena. These results provide a comprehensive understanding of the influence of hydrogen on dislocation-based processes controlling the deformation behavior and hardening in Fe-Ni-Cr austenitic steels.

権利情報:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

キーワード: Austenitic steel, Hydrogen, Dislocation structure, Strain hardening

刊行年月日: 2026-03-07

出版者: Elsevier BV

掲載誌:

• Acta Materialia (ISSN: 13596454) vol. 309 122078

研究助成金:

• Japan Society for the Promotion of Science 25K08261
• Japan Society for the Promotion of Science 24K17180

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1016/j.actamat.2026.122078

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更新時刻: 2026-03-27 10:55:01 +0900

MDRでの公開時刻: 2026-03-27 12:22:36 +0900