Modeling Bainite Dual-Phase Steels: A High-Resolution Crystal Plasticity Simulation Study

A bainite dual-phase (FB) steel containing polygonal ferrite and granular is thermo-mechanically rolled, followed by an accelerated cooling. Two different cooling rates are applied to obtain two materials. The aim of the study explore reasons for differences in mechanical response experimentally observed these materials which modeled means high-resolution crystal plasticity simulations with a phenomenological constitutive description. First, CP parameters individual constituents determined. Second, three-dimensional (3D) representative volume elements (RVEs)—one includes substructure bainite—are used properties both FB microstructures. It shown that, contrast macroscopic response, microscopic differs among RVEs. Third, comparison performed analyzing their stress–strain response. onset found be addition strain partitioning, although they obeyed iso-work assumption. Finally, parameter carried out order investigate correlation between microstructures damage initiation that can seen this steel. difference ultimate elongation may depend on whether first voids appear within or at phase boundary.