Influence of Annealing before First Cold Rolling on Secondary Recrystallization of Fe-3%Si Alloy

Abstract

Secondary recrystallization of a Fe-3%Si alloy containing AIN and MnS precipitates, which is usually given a heavy reduction at the final cold-rolling stage, was investigated with special reference to the influence of annealing of the hot-rolled band before first cold rolling. In the annealing process of hot-rolled band, fine carbides or nitrides with 10 υ 20 nm in diameter precipitated, resulting in increasing the dislocation density with tangling dislocations around those precipitates. Accordingly, on the annealing stage after the first cold-rolling, the recrystallized microstructure was finer and more homogeneous. In addition, a decrease in {211}〈011〉υ{100}〈011〉 (RD⫽〈011〉) oriented grains and an increase in {111 }〈112〉 ones occurred. Annealing of hot-rolled band is probable to have an important effect on the enhancement of (llOKOOl) secondary recrystallized grain growth, because of more {111}〈112〉 primary recrystallized grains, which have Σ9 coincidence orientation relationship to the {110}〈001〉 orientation. © 1994, The Japan Institute of Metals. All rights reserved.