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説明:

Understanding the role of diffusible solute hydrogen (H) as an obstacle to dislocation glide is essential for elucidating the solid solution-hardening mechanisms induced by H in Fe-Cr-Ni austenitic steels and other face-centered cubic (FCC) alloys. In the present study, we address this issue through an effective use of classical stress relaxation tests with a relatively long duration (∼1000 s) at 295 K. A Type310S (Fe–24Cr–19Ni) austenitic stainless steel was examined after uniformly pre-charging ∼8500 at ppm H under a pressurized high-temperature gaseous H₂ environment. The activation volume, V (i.e., a material volume involved in an elementary obstacle-dislocation interaction), as a function of externally applied stress, was analyzed to probe the impact of H on thermally activated dislocation motion through a field of multiple obstacle types. A unified stress–V relationship was identified for both non- and H-charged specimens, in addition to an H-induced retardation of deformation kinetics under an equivalent stress level. These findings demonstrate that the primary obstacles to dislocation motion are alloying elements (and forest dislocations) even under the presence of H, with H contributing an additional activation barrier to overcome these inherent obstacle types.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Austenitic steel, Hydrogen, Dislocations, Thamal activation

刊行年月日: 2026-01-03

出版者: Elsevier BV

掲載誌:

• Acta Materialia (ISSN: 13596454) vol. 306 121896

研究助成金:

• Japan Society for the Promotion of Science

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1016/j.actamat.2026.121896

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更新時刻: 2026-01-14 13:17:53 +0900

MDRでの公開時刻: 2026-01-14 16:22:12 +0900