Journal
INTERNATIONAL JOURNAL OF PLASTICITY
Volume 16, Issue 10-11, Pages 1215-1241Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0749-6419(00)00008-5
Keywords
martensitic transformation; TRIP steels; thermomechanical processes; micromechanics; plasticity
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Several couplings between plasticity and martensitic phase transformation are at the origin of remarkable proper tics of ductility and toughness in the case of TRIP steels, A micromechanical model is developed to predict the conditions of nucleation and growth of a martensitic microdomain inside an inhomogeneous plastic strain field. More explicit relations are developed in the case of a simple shear test where a heterogeneous plastic strain held leads to a significant decrease of the critical stress for martensitic transformation. The obtained results are combined with a kinetics and kinematics studies to derive the constitutive equation of an austenitic single crystal from which the overall behavior of a polycrystalline steel is deduced using the self-consistent scale transition method. Comparison with experimental data shows a good agreemcnt. (C) 2000 Published by Elsevier Science Ltd.
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