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A novel medium manganese steel named Novalloy with compositionFe-8.3Mn-3.8Al-1.8Si-0.5C-0.06V-0.05Sn was developed and thermomechanicallyprocessed through hot rolling and intercritical annealing. The steel possesseda yield strength of 1 GPa, tensile strength of 1.13 GPa and ductility of 41\%.In order to study the effect of cold rolling after intercritical annealing onsubsequent tensile properties, the steel was further cold rolled up to 20\%reduction. After cold rolling, it was observed that the strain hardening rateincreased continuously with increasing cold rolling reduction but without asignificant drop in ductility during subsequent tensile tests. Themicrostructural evolution with cold rolling reduction was analysed tounderstand the mechanisms behind this enhanced TRIP effect. It was found thatcold rolling activated additional twinning systems which provided a largenumber of potent nucleation sites for strain induced martensite to form duringsubsequent tensile tests.

Microstructure evolution and tensile behaviour of a cold rolled 8 wt\% Mn medium manganese steel