Micro structure-based constitutive modeling of TRIP steel: Prediction of ductility and failure modes under different loading conditions

We Study the ultimate ductility and failure modes of a commercial transformation-induced plasticity (TRIP) 800 steel under different loading conditions with an advanced microstructure-based finite-element analysis. The representative Volume element (RVE) for the TRIP 800 under examination is developed based oil an actual microstructure obtained from scanning electron microscopy. The ductile failure of the TRIP 800 Under different loading conditions is predicted in (lie form of plastic strain localization without any prescribed failure criteria for the individual phases. This indicates that the microstructure-level inhomogeneity of the various constituent phases can be the key factor influencing the final ductility of the TRIP 800 Steel Under different loading, conditions. Comparisons of the computational results With experimental measurements suggest that the microstructure-based modeling approach accurately captures the overall macroscopic behavior of the TRIP 800 steel Under different loading and boundary conditions. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.