The large ductility and high resistance of TRIP steels are due to martensitic (Ms) transformation corresponding to an additional deformation mechanism (Bain strain+ accommodation lattice invariant strain mechanism) and an improvement of mechanical strength due to enhanced properties of the martensite. Two classes of models have been developed: In the "multitrip" approach, the representative volume element (RVE) is considered as an evolving two phase material (A+M): the mean transformation strain (MTS) over the whole Ms and the volume fraction of Ms being described in a semi phenomenological manner. The transition from the two phases to the representative volume element results from a non linear self consistent model. This kind of models leads to an easy integration of the behaviour inside a FEM code like ABAQUS for simulation of forming processes.
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