无取向硅钢形变储能取向依赖性及其对再结晶织构的影响

采用晶体塑性有限元模拟与实验相结合的方式,研究无取向硅钢冷轧过程中不同初始织构组分的取向流动与形变储能累积。结果表明:冷轧后形成了较强的α,γ形变织构和较弱的λ形变织构。再结晶织构由γ,α,η和λ织构组成,其取向密度依赖于冷轧压下率。随冷轧压下率增大,λ再结晶织构逐渐增强,η织构先增强后减弱,γ织构先减弱后增强,α织构稍有弱化。冷轧过程中形变储能累积具有明显的初始取向依赖性,初始γ取向储能累积速率在低于50%压下率时与初始α取向接近,高于50%压下率时则明显大于后者,初始λ取向储能累积速率始终显著低于γ和α取向,转至同一形变取向的不同初始取向间的储能累积也会产生差异。冷轧过程中不同初始织构组分的取向流动与形变储能累积规律,决定了无取向硅钢再结晶织构组分的发展。

Orientation dependence of strain stored energy and its effect on recrystallization texture in non-oriented silicon steel

The crystal plasticity finite element simulation and experiment were used to study the orientation flow and strain stored energy accumulation of different initial texture components during cold rolling in non-oriented silicon steel. The results show that strong α and γ as well as weak λ deformation textures are formed after cold rolling. The recrystallization texture consists of γ,α,η and λ components, whose orientation densities are dependent on cold rolling reduction. With the increase of cold rolling reduction,λ recrystallization texture increases gradually,η recrystallization texture increases first and then decreases,γ recrystallization texture decreases first and then increases, while α recrystallization texture is weakened slightly. The strain stored energy during cold rolling has a significant dependence on initial grain orientation that the initial γ orientation has a similar or evidently higher strain stored energy accumulation rate below or above 50% reduction compared with initial α orientation, while λ keeps the lowest strain stored energy accumulation rate during cold rolling. Particularly, the different initial orientations rotating to an identical deformed orientation may cause an obvious difference in strain stored energy accumulation rate. The development of recrystallization texture in non-oriented silicon steel is determined by orientation flow and strain stored energy accumulation in various texture components during cold rolling.