无取向硅钢在全工艺流程中的组织和织构变化

Microstructure and Texture Changes of Non-oriented Silicon Steel in the Whole Process

选用硅含量2.5%~3.5%(质量分数)的无取向硅钢作为分析对象,研究了其在全工艺流程(热轧、常化、冷轧、退火)中的组织和织构变化。结果表明:由于形变和温度场的分布特征,该无取向硅钢热轧板形成组织分层,表层为再结晶组织,中心层为带状回复组织,过渡区域混杂分布再结晶和回复组织。同时厚度方向表现出很大的织构梯度,并会一直遗传至成品板,但织构梯度随着形变和再结晶会不断弱化。常化后热轧带状组织消失,再结晶晶粒发生了充分长大。冷轧后,无取向硅钢的组织主要表现为沿轧制方向伸长的带状组织。该无取向硅钢的形变和再结晶行为一般规律为形变形成α线织构,再结晶后转变为γ线织构和α*织构。

The non-oriented silicon steel with silicon contentof2.5%-3.5%(mass fraction)was selected as the analysis object,and the microstructure and texture changes during the whole process(hot rolling,normalizing,cold rolling,annealing)were studied.The results show that due to the distribution characteristics of deformation and temperature field,the non-oriented silicon steel hot rolled plate formed hierarchical structure,the surface layer was recrystallization structure,the central layer was banded recovery structure,and the transition region was mixed with recrystallization and recovery structure.At the same time,there was a large texture gradient in the thickness direction,which will be inherited to the finished plate,but the texture gradient will be weakened with the deformation and recrystallization.After normalizing,the hot rolled banded structure disappeared and the recrystallized grains grown sufficiently.After cold rolling,the microstructure of non-oriented silicon steel was mainly strip structure extending along the rolling direction.The general rule of deformation and recrystallization behavior of the non-oriented silicon steel is that α line texture was formed during deformation,and then transformed intoγline texture andα*texture after recrystallization.