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- Title
Transformation and Twinning-Induced Plasticity Effect in a Novel Heterogeneous Microstructural Medium-Mn Steel Processed by ART Annealing.
- Authors
Chen, Hao; Xu, Haifeng; Zhou, Tianpeng; Chen, Zejun
- Abstract
A novel medium-Mn steel with 9.7 wt.% Mn content was developed through warm-rolling, cold-rolling and austenite-reverted transformation (ART) annealing processes, which presented an excellent combination of mechanical properties (the product of strength and ductility being ≥ 60 GPa⋅%). The tensile behavior and microstructure evolution of the novel medium-Mn steel with different ART processes were studied in detail. The steel inherited the banded microstructure produced by warm rolling when annealed at 600 °C. Heterogeneous microstructures composed of fine recrystallized equiaxed dual-phase grains and coarse non-recrystallization austenite grains were obtained after ART annealing at 700 °C and 750 °C. Moreover, the heterogeneous microstructure resulted in a higher strain-hardening rate than the banded microstructure. In addition, the different morphology distributions of austenite grains gave rise to austenite mechanical stability, thus triggering the multistage transformation and twinning-induced plasticity (TRIP and TWIP) effects during tensile deformation. Multiple strengthening and ductility-enhancing mechanisms including the TRIP effect, TWIP effect and dislocation strengthening contribute to the combination of ultrahigh strength and uncompromised ductility.
- Subjects
ARTISTIC creation; STEEL; COLD rolling; AUSTENITE; MICROSTRUCTURE
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2022, Vol 74, Issue 7, p2826
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-022-05337-6