About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
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Symposium
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Ultrafine-grained and Heterostructured Materials (UFGH XI)
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Presentation Title |
Heterogeneous Lamella Phases Make 2205 Stainless Steel with Superior Strength and Ductility |
Author(s) |
Peiqing La, Yu Shi |
On-Site Speaker (Planned) |
Peiqing La |
Abstract Scope |
Grain refinement to nanoscale can make the conventional steels several times stronger, but invariably leads to poor ductility. Here we demonstrate a lamellar dual-phase heterogeneous nanostructure in 2205 stainless steel synthesized by aluminothermic reaction and followed hot rolling that produced a superior yield strength of 780MPa, ultimate tensile strength of 990 MPa and an elongation of 54.6% at room temperature. The elongation is the highest in the reported duplex stainless steels with that level of strength. The product of tensile strength and elongation exceeds 50 GPa% and is the highest value for all of the steels that was reported in the literatures. The steel consists of heterogeneous lamellar ferrite phase and austenitic phase. The high strength is attributed to strengthening of high back stress arising form hierarchical and laminated dual-phase heterogeneous structure and distribution. The unusual high ductility originates from back-stress hardening and dislocation hardening. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume |