Effects of Grain Boundary Characteristics on Secondary Recrystallization Textures in Fe-Si Alloy

摘要

To understand the factors that determine the secondary recrystallization textures of Fe-Si alloy, the change in the secondary recrystallization textures of Fe-Si sheets was investigated by increasing the cold-rolled reduction rate (CR) from 70 up to 95%. The secondary recrystallization textures in the CRs=90-95% samples accumulated in specific orientations; the main components of the secondary recrystallization were {110} <001> in the CRs=90 and 93% samples, and {110} <001> with {110}<112> in the CR=95% sample. The experimental results were reproduced by calculations based on the idea that the secondary recrystallization texture is mainly determined by the frequency of the specific-orientation-grain-boundaries, for example, coincidence-site-lattice grain boundaries. In contrast, in the CR = 70% sample, the secondary recrystallization texture was not accumulated but dispersed from {110} <001> to {110} <225> and was inaccurately reproduced by the above calculations. The study concludes that the secondary recrystallization textures in the CRs = 90-95% samples are mainly determined by the grain boundary effect. It is also concluded that the secondary recrystallization textures of the CR = 70% sample are determined by both grain boundary effect and nucleus effect. The difference in the mechanisms originates from the changes in the frequency of the specific-orientation-grain-boundaries in the matrix and of the nuclei at the surface in the primary recrystallization textures of various CRs.