Article Breaking the strength-ductility trade-off in austenitic stainless steel at cryogenic temperatures: Mechanistic insights

Digvijay Singh ORCID (National Institute for Materials ScienceROR) ; Fumiyoshi Yoshinaka SAMURAI ORCID (National Institute for Materials ScienceROR) ; Susumu Takamori SAMURAI ORCID (National Institute for Materials ScienceROR) ; Satoshi Emura SAMURAI ORCID (National Institute for Materials ScienceROR) ; Takahiro Sawaguchi SAMURAI ORCID (National Institute for Materials ScienceROR)

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Digvijay Singh, Fumiyoshi Yoshinaka, Susumu Takamori, Satoshi Emura, Takahiro Sawaguchi. Breaking the strength-ductility trade-off in austenitic stainless steel at cryogenic temperatures: Mechanistic insights. Journal of Materials Research and Technology. 2024, 33 (), 600-611. https://doi.org/10.1016/j.jmrt.2024.09.074
SAMURAI

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(abstract)

At cryogenic temperatures, 316L austenitic stainless steels (ASSs) exhibit remarkable strength while retaining high ductility, defying conventional stress-strain trade-off. Despite extensive studies documenting the cryo-tensile properties of ASSs, the underlying mechanisms behind this phenomenon remain largely unexplored. This study systematically re-examines the tensile properties of 316L steel and the associated mechanisms across a range of low temperatures (293 K, 223 K, 123 K, and 77 K). The reasons for the superior stress-strain balance (~ 80% GPa) are discussed through electron backscatter diffraction (EBSD) microstructure characteristics. The results undoubtedly suggested that the transformation mechanisms, specifically the shift from deformation twinning to martensitic transformation (γ → ε → α; γ → α), play a crucial role in enhancing elongation at cryogenic temperatures. At these temperatures, the Gibbs free energy difference between ε-martensite and γ-austenite approaching zero, resulting in slow martensite growth. The stress-strain curves at low temperatures satisfy the Considère criterion, indicating delayed necking under these conditions. This behavior is ascribed to presence of various hierarchical microstructures, including ε, α, γ-twins, ε-twins and their intersections, which act as sources of work hardening. This study provides new insights into deformation behavior of ASSs under cryogenic conditions.

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Keyword: Strength-ductility balance, Austenitic stainless steel, Martensitic transformation, Deformation twinning, Strain-hardening rate

Date published: 2024-09-12

Publisher: Elsevier BV

Journal:

  • Journal of Materials Research and Technology (ISSN: 22387854) vol. 33 p. 600-611

Funding:

  • Japan Society for the Promotion of Science 21H01659
  • Japan Society for the Promotion of Science 23K13227

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

MDR DOI:

First published URL: https://doi.org/10.1016/j.jmrt.2024.09.074

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Updated at: 2024-09-19 16:30:19 +0900

Published on MDR: 2024-09-19 16:30:20 +0900

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