Abstract
The microstructures and mechanical properties of Fe-32Mn-0.6C steel after deformation, dynamic recovery and recrystallization were investigated. Dynamic recovery occurred during rolling at 800°C, and fined subgrains formed at deformation introduced lamellar boundaries. During tensile deformation, a large amount of deformation twins is activated, leading to a high work-hardening. Compared to the cold-rolled and coarse-grained recrystallized samples, the 800°C rolled sample shows an improved combination of strength and ductility at both room temperature (RT) and liquid nitrogen temperature (LNT). Specifically, the yield strength and uniform elongation are 702 MPa and 61%, respectively, at RT and are 1013 MPa and 48%, respectively, at LNT.
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