Breaking the strength-ductility trade-off in austenitic stainless steel at cryogenic temperatures: Mechanistic insights
At cryogenic temperatures, 316L austenitic stainless steel (ASS) exhibits remarkable strength while retaining high ductility, defying the conventional stress-strain trade-off. Despite extensive studies documenting the cryo-tensile properties of ASSs, the underlying mechanisms behind this phenomenon...
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Elsevier
2024-11-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785424020799 |
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| author | Digvijay Singh Fumiyoshi Yoshinaka Susumu Takamori Satoshi Emura Takahiro Sawaguchi |
| author_facet | Digvijay Singh Fumiyoshi Yoshinaka Susumu Takamori Satoshi Emura Takahiro Sawaguchi |
| author_sort | Digvijay Singh |
| collection | DOAJ |
| description | At cryogenic temperatures, 316L austenitic stainless steel (ASS) exhibits remarkable strength while retaining high ductility, defying the 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 stainless 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 using results from electron backscatter diffraction (EBSD) microstructure characteristics. The results undoubtedly suggest that the transformation mechanisms, specifically the shift from deformation twinning to martensitic transformation (γ → ε → 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 approaches 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 the 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. |
| format | Article |
| id | doaj-art-2b624523f75c41338e0b8dce62e0f5b0 |
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| issn | 2238-7854 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Elsevier |
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| series | Journal of Materials Research and Technology |
| spelling | doaj-art-2b624523f75c41338e0b8dce62e0f5b02025-08-20T02:38:59ZengElsevierJournal of Materials Research and Technology2238-78542024-11-013360061110.1016/j.jmrt.2024.09.074Breaking the strength-ductility trade-off in austenitic stainless steel at cryogenic temperatures: Mechanistic insightsDigvijay Singh0Fumiyoshi Yoshinaka1Susumu Takamori2Satoshi Emura3Takahiro Sawaguchi4National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki, 305-0047, JapanNational Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki, 305-0047, JapanNational Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki, 305-0047, JapanNational Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki, 305-0047, JapanCorresponding author.; National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki, 305-0047, JapanAt cryogenic temperatures, 316L austenitic stainless steel (ASS) exhibits remarkable strength while retaining high ductility, defying the 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 stainless 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 using results from electron backscatter diffraction (EBSD) microstructure characteristics. The results undoubtedly suggest that the transformation mechanisms, specifically the shift from deformation twinning to martensitic transformation (γ → ε → 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 approaches 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 the 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.http://www.sciencedirect.com/science/article/pii/S2238785424020799Strength-ductility balanceAustenitic stainless steelMartensitic transformationDeformation twinningStrain-hardening rate |
| spellingShingle | 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 Strength-ductility balance Austenitic stainless steel Martensitic transformation Deformation twinning Strain-hardening rate |
| title | Breaking the strength-ductility trade-off in austenitic stainless steel at cryogenic temperatures: Mechanistic insights |
| title_full | Breaking the strength-ductility trade-off in austenitic stainless steel at cryogenic temperatures: Mechanistic insights |
| title_fullStr | Breaking the strength-ductility trade-off in austenitic stainless steel at cryogenic temperatures: Mechanistic insights |
| title_full_unstemmed | Breaking the strength-ductility trade-off in austenitic stainless steel at cryogenic temperatures: Mechanistic insights |
| title_short | Breaking the strength-ductility trade-off in austenitic stainless steel at cryogenic temperatures: Mechanistic insights |
| title_sort | breaking the strength ductility trade off in austenitic stainless steel at cryogenic temperatures mechanistic insights |
| topic | Strength-ductility balance Austenitic stainless steel Martensitic transformation Deformation twinning Strain-hardening rate |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424020799 |
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