About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Heterostructured and Gradient Materials (HGM V): New Mechanistic Discoveries Enabling Superior Properties
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Presentation Title |
Strengthening Mechanisms in a Heterostructured and Antimicrobial Stainless Steel |
Author(s) |
Liliana Romero Resendiz, Yuntian Zhu |
On-Site Speaker (Planned) |
Liliana Romero Resendiz |
Abstract Scope |
A heterostructured and antimicrobial stainless steel (HS&A SS) consisting of a 316L SS with Cu nanoparticles (NPs) was developed by combining conventional thermo-mechanical techniques. Three different HS microstructures were studied; 1) austenitic ultrafine-grained matrix with homogeneously dispersed Cu NPs (UFG-NP), 2) lamella-like recrystallized austenitic grains surrounded by ultrafine matrix and dispersed Cu NPs (HLS-NP), and 3) lamella-like recrystallized austenitic grains surrounded by ultrafine matrix and ultrafine Cu regions (HLS). An effective contribution of hetero-deformation induced (HDI) strengthening was obtained for all the HS conditions. However, the long-range stress generated by geometrically necessary dislocation pile-ups at the interfaces was higher for the HLS and HLS-NP. The HDI strengthening mechanism had a synergistic effect with the strain-induced phase transformation of austenite to martensite, twinning, high density of grain boundaries, and second phase dispersion. A reduced strength to ductility trade-off of the HS&A SS compared to conventional nanometric and micrometric SS was obtained. |
Proceedings Inclusion? |
Planned: |
Keywords |
Iron and Steel, Mechanical Properties, Biomaterials |