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

Abstract

Abstract

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 \((111)[1\overline{2 }1]\) 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.