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Tailoring hetero-grained austenite via a cyclic thermomechanical process for achieving ultrahigh strength-ductility in medium-Mn steel
Cited 14 time in
Web of Science
Cited 16 time in Scopus
- Authors
- Issue Date
- 2022-08
- Publisher
- Pergamon Press Ltd.
- Citation
- Scripta Materialia, Vol.217, p. 114767
- Abstract
- In this study, a bimodal-grained austenite, composed of approximately 30% coarse grains and about 70% refined grains in (alpha+gamma) medium Mn steel, was designed and developed based on a novel and simple cyclic thermomechanical process. The austenite stability was adjusted using these hetero-structures to regulate the strain induced martensite transformation kinetics to balance the strength, ductility, and fracture resistance could be balanced. By coupling the transformation induced plasticity (TRIP) effect, hetero-deformation induced (HDI) strengthening and twinning-induced plasticity (TWIP) effect, the hetero-structured steel achieved an ultra-high tensile strength of nearly 1260 MPa and an elongation of approximately 70%, i.e., the product of strength and elongation of over 88 GPa%. This study presents a novel insight into an austenite-stability-guided microstructural design to address the strength-ductility/toughness trade-off in medium Mn steel.
- ISSN
- 1359-6462
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