Research on the evolving yielding behaviour and micro-mechanism in biaxial deformation of DP1180 sheet based on crystal plasticity finite element model

Abstract Dual-phase steels (DP steels) consist of ferrite and hard martensitic phase. For the high strength good formability, they are widely used in automotive applications. Compared with DP lower strength, DP1180 is more special for volume fraction martensite higher than that ferrite. In this paper, evolving plastic yielding behaviours insight into their microscale mechanisms were studied by biaxial tension experiments crystal plasticity finite element method. The representative (RVE) model taking dual phase fraction, grain size texture consideration established relevant parameters reverse calibrated uniaxial tensile test stress strain curve. simulated tests conducted RVE to investigate micro-mechanisms steel, obtained yield loci matches well results. simulation results show has a significant effect on contours loci. soft grains weaken kinetic constraints polycrystalline matrix further free rotation deformation neighbouring grains. This study thus provides comprehensive understanding microstructure (crystal structure, fraction) behaviour steel as method virtual experiment get metallic materials.