| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Ultrafine-grained and Heterostructured Materials (UFGH XIII)
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| Presentation Title |
Microstructure and Mechanical Properties of Heterogeneous-nanostructured Duplex Stainless Steels |
| Author(s) |
Hiromi Miura, Koji Koyama, Yojiro Oba, Masakazu Kobayashi, Chihiro Watanabe |
| On-Site Speaker (Planned) |
Hiromi Miura |
| Abstract Scope |
Duplex stainless steels (DSSs) with different α/γ phase ratios were heavily cold rolled to develop heterogeneous nanostructure, in which {001}<011> or {111}<011> α and {011}<112> γ were alternatively stacked. Especially, γ exhibited specific feature that “eye”-shaped twin domains surrounded by shear bans were embedded in low-angle lamellae, while α was simply composed of substructure. The heavily cold-rolled DSSs exhibited large mechanical anisotropy that tensile strength along transverse direction (TD) was larger than that along rolling direction. Tensile tests along TD showed quite high tensile strength (TS) over 1.5 GPa and was further increased with decreasing α/γ ratio. By aging at 748 K, in contrast, TS of the DSSs with higher α/γ ratio was more notably raised, up to 2.3 GPa. TEM and EDS analyses suggested that strengthening by aging should be induced by dense precipitation in α and enrichment of elements at α/α, γ/γ and α/γ boundaries. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Iron and Steel, Mechanical Properties |