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A constitutive model for a high alloyed cast CrMnNi TRIP‐steel

The macroscopic material model, proposed by Papatriantafillou [1], is adopted to describe the rate dependent flow behaviour and the temperature and stress state dependent γ‐α′ phase transformation of a newly developed cast TRIP‐steel. Simple test of the implemented model revealed that the evolution of the martensite volume fraction is not predicted correctly in case of inelastic deformation and subsequent unloading. Therefore, we present an improved model for the γ‐α′ phase transformation and show that these predictions are due to the choice of the corresponding thermodynamical driving force. (© 2011 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)