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Solute hydrogen (H) is recently identified to improve the strength and ductility of some Fe-Cr-Ni austenitic steels due to a combination of solid-solution hardening and accelerated deformation twinning. In the present study, the impact of deformation temperature (173∼373 K) on this ductilization effect was studied primarily under a slow strain rate in Fe-24Cr-19Ni steel pre-charged with 7570 at ppm H. Ambient temperature was found to be an optimized condition where H-induced ductilization was the most pronounced. With the lowering temperature below 200 K, ductilization was mitigated entirely in spite of still substantial H-induced twinning enhancement. The result was ascribed to an overly prompted twinning activity and its premature density saturation, encompassing a consummation of work-hardenability at an earlier deformation stage.

Rights:

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

Keyword: Austenitic steels, Hydrogen, Twinning, Temperature, Ductility

Date published: 2023-09-12

Publisher: Elsevier BV

Journal:

• Scripta Materialia (ISSN: 13596462) vol. 238 115760

Funding:

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4647

First published URL: https://doi.org/10.1016/j.scriptamat.2023.115760

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Updated at: 2025-09-12 08:30:17 +0900

Published on MDR: 2025-09-12 08:18:17 +0900