Unique Effect of Carbon Addition on Development of Deformation and Recrystallization Textures in Heavily Cold-Rolled Fe-3%Si Alloys

Abstract

This study investigated the effects of carbon addition on the development of deformation and recrystallization textures in 3 mass% Si steels cold-rolled by 95% reduction in thickness. A 3% Si steel with 0.016 mass% carbon developed RD // <110> (α-fiber) cold-rolling texture to a much greater extent than a 3% Si steel containing carbon less than 0.0005 mass%, whereas it is well known that the development of α-fiber rolling texture is suppressed by the addition of carbon in steels without silicon. This unique effect of carbon addition in the 3% Si steel appeared to be originated from a change in active slip systems. Straight slip bands were observed in the specimen without carbon, and the active slip plane was identified as {110}. On the other hand, wavy slip bands were observed in the steel containing carbon resulted from the activation of {112} and {123} slip planes in addition to {110}. It was also observed that {411}<148> recrystallization texture developed in the carbon-bearing 3% Si steel. Since the recrystallized grains with {411}<148> orientation preferentially nucleated in the vicinity of highly-strained deformation bands formed in deformed grains having α-fiber orientations, it is concluded that the development of {411}<148> recrystallization texture was resulted from the formation of the α-fiber texture after heavy cold-rolling in the carbon-bearing 3% Si steel.