Changes in the Heterogeneous Deformation Structure and Texture with Cold Rolling Reduction in {110}<110> Oriented Coarse Grained 3% Silicon Steel

Abstract

We systematically investigated changes in crystal orientation due to the cold rolling of a {110}<110> single crystal, which had not been researched to date, in a reduction range of 10–70%. The results allowed for a classification of the changes into the following three reduction cases. The first was a 10–20% reduction. For this reduction, there was almost no change in the matrix orientation, and a shear band slightly appeared near the surface layer. The second was a 30–50% reduction, at which many shear bands were introduced, and the crystal orientation inside the shear bands was rotated from the initial {110}<110> orientation to the {100}<001> orientation around the TD axis. There are cells in the shear band. And {100}<001> orientation cells are considered having lower strain than around cells to having lower GAM. Additionally, the {111}<211> orientation was also confirmed in a small area that was thought to be surrounded by shear bands. The third was a 60–70% reduction, at which the matrix rotated to {111}<110>, but there were some areas with a {111}<211> orientation. Furthermore, the shear bands increased with increasing reduction, and more inner orientations were observed for {111}<211> than for {100}<001>. {111}<211> bands and {100}<001> bands are considered different origins to change discontinuously.