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The influence of the chemical composition and the grain size of retained austenite in an ultra-fine grained medium manganese steel on the martensite transformation kinetics was investigated by means of dilatometry. A modified Koistinen–Marburger type exponential function was developed for the martensite transformation kinetics, which includes the influence of the size and the composition of the austenite. Whereas the ultra-fine grained retained austenite had a remarkably low  M  s  temperature, the kinetics of its transformation to martensite was accelerated.

Martensite transformation of sub-micron retained austenite in ultra-fine grained manganese transformation-induced plasticity steel