A Dislocation Density-Based Model for Analyzing Mechanical Behavior of Dual-Phase Steels

The aim of this work is to develop a microstructural analysis of the mechanical behavior of dual-phase steels. Finite element simulations were conducted, and the results were validated by experimental observations. A dislocation density constitutive formulation was used for the ferrite phase, while the Gurson-Tvergaard-Needleman damage model and an elastic-plastic model with isotropic hardening were used for the grain boundaries and martensite, respectively. The deformation and failure behavior of the material predicted by the model developed here showed good agreement with experimental observations. Moreover, the investigation on the effect of grain size and martensite volume fraction revealed that the microstructural inhomogeneity plays an important role in material behavior. © 2014 Springer Science+Business Media New York and ASM International.