About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
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Symposium
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Advances in Multi-Principal Element Alloys IV: Mechanical Behavior
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Presentation Title |
A Novel Low-Cost Medium-Entropy Stainless Steel with Exceptional Mechanical Behavior Over a Wide Temperature Range |
Author(s) |
Tongde Shen |
On-Site Speaker (Planned) |
Tongde Shen |
Abstract Scope |
Stainless steels exhibit strength-ductility trade-off and insufficient elevated-temperature strength. We have developed a novel low-cost cobalt-free Fe47Cr16Ni26Ti6Al5 (at%) medium-entropy stainless steel (MESS) - strengthened by high-density coherent L12 nanoprecipitates - with high ultimate tensile strength of 1.35 GPa and a total elongation of 36% at room temperature. The ductile L12 nanoprecipitates working together with the dynamic refinement of the deformation substructures cause an excellent work-hardening ability. Furthermore, the MESS maintains high yield strength of ~ 0.8 GPa at 700 oC, which is not only better than many iron-based superalloys and stainless steels but also comparable to some nickel-based superalloys. The steady-state creep rates at 750 oC are at least two orders of magnitude lower than those of some nickel-based superalloys and heat-resistant steels. The excellent creep resistance is achieved via the strong interactions between sliding dislocations and stable L12 nanoprecipitates, which effectively impede the movement of dislocations. |
Proceedings Inclusion? |
Planned: |
Keywords |
Iron and Steel, High-Entropy Alloys, Mechanical Properties |