Abstract
A heterogeneous multiphase medium Mn steel (Fe-10Mn-0.47C-2Al-0.7V, wt.%) consisting of prior austenite, martensite, reverted austenite, and ferrite is, for the first time, realized by both austenite reverted transformation and ferrite transformation. The phase fraction, kinetics, mechanisms, and microstructure evolution during the transformation sequence are systematically investigated. The heterogeneous multiphase medium Mn steel has great potential for high strain hardening by a continuous transformation-induced plasticity effect, grain-size gradient, and stress–strain partitioning. The present work provides a new pathway to design a heterogeneous multiphase microstructure in medium Mn steel.
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