About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Ultrafine-Grained and Heterostructured Materials (UFGH) XIV
|
| Presentation Title |
Microstructure and deformation behavior of heterogeneous nano-structured austenitic stainless steel pre-deformed at cryogenic temperature |
| Author(s) |
Chihiro Watanabe, Norimitsu Koga, Hiromi Miura |
| On-Site Speaker (Planned) |
Chihiro Watanabe |
| Abstract Scope |
Heterogeneous nano- (HN-) structured SUS316LN stainless steel, produced by heavy cold rolling, exhibits an excellent strength–ductility balance at 77K due to deformation-induced martensitic transformation accompanied by the transformation-induced plasticity (TRIP) effect. Although the TRIP effect is typically inactive at room temperature (RT) in 316-type steels because of high austenite stability, recent studies have suggested that α’-martensite nucleated during cryogenic deformation can grow during subsequent room-temperature deformation. In the present study, the effects of cryogenic pre-deformation on the mechanical behavior of HN-structured SUS316L steel at RT were investigated. The total elongation without pre-deformation was 6%, which increased significantly to 13%, while the tensile strength remained almost constant at ~1350MPa. Microstructural observations and magnetic measurements confirmed α’-martensite nucleation at 77K and their growth during subsequent room-temperature deformation. These findings indicate that pre-existed α’ nuclei can be active to cause TRIP effect to HN-structured stable austenitic stainless steel even at RT. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Mechanical Properties, Phase Transformations |