Shear texture control in low carbon steel sheet by differential speed rolling

Large shear deformation was successfully introduced in a low carbon steel sheet by differential speed warm rolling without lubrication. The roll speed ratio was varied from 1.0 to 2.0. When roll speed ratio is smaller than 1.2, shear strain increases near the surface, however it decreases to zero at the midthickness. With the roll speed ratio larger than 1.4, shear strain is introduced even at the midthickness, and it increases near the surface. The amount of shear strain increases with roll speed ratio. After 2-pass differential speed rolling, a large shear strain is introduced throughout the thickness. The rolling direction of the second pass was so varied that the direction of shear deformation introduced in the second pass was similar (unidirectional shear rolling) or opposite (reverse shear rolling) to that in the first pass. The shear texture of which main components are {110}<001>, and {112}<111> prevails throughout the thickness, and conventional rolling texture such as {111}<112> or {001}<110> orientation cannot be detected in any part of thickness. The rolling direction of the second pass exerts a little effect on the deformation texture. After recrystallization annealing, shear texture components are retained. The intensity Goss orientation after recrystallization is higher than the deformation texture. The differential speed rolling, by which shear deformation can be introduced throughout the thickness, is proved to be promising process for improving physical and mechanical properties of the rolled and annealed steel sheets by texture controlling.