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Plastic flow behavior and strain rate sensitivity, S, of Fe-15Cr-15Ni (mass%) austenitic steel, alloyed with either hydrogen or carbon, were evaluated by tensile and stress relaxation tests at ambient temperature. The effects of these two interstitial elements on solid solution-hardening and thermally activated dislocation motion were compared in terms of Haasen plot—S versus flow stress. Both hydrogen and carbon exhibited solid solution-hardening of the same order of magnitude, increasing S proportionally with their concentrations. However, their ability to increase S was distinct. Hydrogen caused a much steeper increase in S, acting as extremely localized obstacles resisting dislocation motion. In contrast, despite exhibiting comparable solid solution-hardening, carbon led to an order of magnitude smaller increase in S than hydrogen. This result demonstrates a relatively long-range and less rate-sensitive nature of carbon, which is totally different from hydrogen in its obstacle character.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Thermally activated processes, Strain rate sensitivity, Hydrogen, Carbon, Austenitic steels

Date published: 2025-11-22

Publisher: Elsevier BV

Journal:

• Scripta Materialia (ISSN: 13596462) vol. 273 117111

Funding:

• Japan Society for the Promotion of Science 24K17180
• Iketani Science and Technology Foundation 0371199-A

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1016/j.scriptamat.2025.117111

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Updated at: 2025-11-28 12:30:04 +0900

Published on MDR: 2025-11-28 12:24:16 +0900