Crystal plasticity simulation of in-grain microstructure and microtexture evolution during large deformation
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High-resolution 3D crystal plasticity simulations are employed to investigate deformation heterogeneity and in-grain microstructure evolution during large deformation of interstitial free (IF-) steel. The crystal plasticity simulations are conducted using a dislocation-density-based crystal plasticity model. The in-grain texture evolution and misorientation spread are consistent with experimental results obtained using electron backscatter diffraction (EBSD) experiments. Crystal plasticity simulation shows that two types of strain localization develop during the large deformation of IF-steel. The first type forms band-like areas with large strain accumulation that appear as river patterns extending across the specimen. In addition to these river-like patterns, a second type of strain localization with rather sharp and highly localized in-grain shear bands is identified. These localized features are dependent on the crystallographic orientation of the grain and extend within a single grain. In addition to the strain localization, the evolution of in-grain orientation gradients, dislocation density, kernel average misorientation, and stress in major texture components are discussed.
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