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Dissolution of atomic hydrogen (H) into Fe-Cr-Ni austenitic steels causes a significant increase in flow stress (i.e., solid solution-hardening, SSH) during their plastic deformation. In this study, the characteristics and kinetics of H-induced SSH in AISI Type 310S steel with 7600 at. ppm H were studied through the measurements of strain rate sensitivity, m, by stress relaxation and strain rate jump experiments at 296 K. Two factors were found to contribute to the SSH: (i) the role of H as thermally activatable obstacles that increase the effective stress; (ii) the resistance acting on moving dislocations due to their dragging of the H atmosphere (solute drag). These factors operated cooperatively or competitively in determining the m value and its dependencies on stress, strain, and strain rate. The peak SSH can be achieved where the sum of dislocation glide resistances from (i) and (ii) is maximized. The anticipated strain rate range for establishing such a situation coincided accurately with the author’s previous experiments.

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

Keyword: Austenitic steel, Hydrogen, Solid solution-hardening, Plasticity, Thermal activation

Date published: 2024-07-14

Publisher: Elsevier BV

Journal:

• Materials Science and Engineering: A (ISSN: 09215093) vol. 911 146941

Funding:

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4646

First published URL: https://doi.org/10.1016/j.msea.2024.146941

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Updated at: 2024-08-08 16:24:07 +0900

Published on MDR: 2026-07-14 08:23:13 +0900