Crystal plasticity finite element study on the formation of Goss-oriented deformation inhomogeneous regions in electrical steels

For electrical steels, the volume fraction and distribution of the residual Goss-oriented regions after cold rolling is critical in controlling the Goss texture during subsequent annealing treatment. The heterogeneous distribution of Goss-oriented regions and its evolution is not quantitatively understood and many simulation methods are lack of microstructure information. A full field crystal plasticity finite element method was employed to estimate the microstructure evolution during rolling for a Goss-oriented grain and two setups of bicrystals composing of ((111)[overline{1 }overline{1 }2]) and (110)[001] orientations respectively. The simulation results indicate that the possibility of Goss-oriented grains remaining within microbands depended on the intensity of the two symmetrical ((111)[overline{1 }overline{1 }2]) and ((111)[1overline{2 }1]) orientations, and the higher the ((111)[overline{1 }overline{1 }2])-oriented intensity was, the more residual Goss-oriented regions as microbands were. The ((111)[overline{1 }overline{1 }2]) component intensity was lower and its volume fraction was less under the additional displacement gradient component L13, so that the Goss orientation remained only on the upper and lower surfaces of the rolled sheet in the Goss-oriented quasi-single crystal model. There are the residual Goss-oriented regions as microbands in both groups of bicrystals. When the Goss-oriented grain in the upper part, the intensity of the ((111)[overline{1 }overline{1 }2]) component is higher, and the microbands distribution characteristics of residual Goss-oriented regions are more obvious.