Temper-rolling and Annealing Texture in Columnar Grains of Silicon Steel Sheets

Abstract

Texture evolution by strain annealing process was studied using 0.5% silicon steel sheets of which structure was mostly composed of columnar grains and showed 65~75% of (100)<0wv>texture. The specimen of columnar grains were prepared by annealing Fe-Si sheets at 1000？C for 10min in the vacuum level of 3.5x10-1 and the hydrogen flow rate of 100ml/min. Development of (100)<0vw>texture composed with columnar grains by α→γ→α transformation has been investigated. These specimens were temper-rolled and annealed for the study of strain induced boundary migration (SIBM). The method of evolution by columnar grains is one of the most effective ways to research SIBM because each grain is equally strained by temper-rolling without the restriction of grain boundaries. It was clearly shown that (310)//ND, (611)//ND, and (321)//ND grains tend to rotate toward (100)//ND. The rotation by temper-rolling depends on the initial orientation. It was found that Taylor factor is proportional to the stored energy measured by Vickers hardness.