热轧无取向Fe-3.28%Si钢常化过程微观组织研究

Research on Microstructure of Hot-rolled Non-oriented Fe-3.28% Si Steel in Normalizing Process

利用OM、XRD研究了常化工艺参数对热轧无取向硅钢板组织及织构的影响。结果表明：热轧硅钢常化后晶粒变大,变形带对常化过程组织形貌具有重要影响,常化后TD-RD面主要是等轴晶,晶界受常化温度影响较小,厚度方向较大的变形量使RD-ND和TD-ND面的晶界沿变形带方向分布,晶粒多为不规则形状;常化温度低于950℃时,随温度升高,残留的动态再结晶晶粒长大导致组织趋于均匀;温度超过1000℃时,在畸变的晶界上产生少量静态再结晶且原始晶粒异常长大,组织不均匀性增加,较短的常化时间对组织均匀性影响不大;常化处理为950℃保温5 min时,（110）面组分减小,晶粒取向性减弱,因此经过950℃保温5 min的常化处理的钢可以获得理想的组织,有利于后续的冷轧变形和组织调控。

The influences of normalizing process parameters on microstructure and texture of hot-rolled non-orientedsilicon steel sheets were investigated by using optical microscope （OM） and XRD. The results show that the grains in hotrolled silicon steel become larger after normalizing, and the deformation band has important influence on the microstructureand morphology of the normalizing process. The grains on TD-ND plane are mainly equiaxed grains after normalizing, and thegrain boundary is less affected by normalizing temperature; the large deformation in the thickness direction makes the grainboundary of RD-ND and TD-ND planes distribute along the deformation bands direction, and most of grains are irregularshapes. When the normalizing temperature is lower than 950 ℃, the residual dynamic recrystallization grains grow up, and themicrostructure tends to be uniform with the increment of temperature; when the normalizing temperature is higher than 1000℃, a small amount of static recrystallization is produced on the distorted grain boundaries, and the original grains grow upabnormally, the uniformity of the microstructure increases, and the short normalization time has little influence on theuniformity of the microstructure; when the normalizing treatment is 950 ℃ for 5 rain, （1 I0） plane component decreases andthe grain orientation decreases. Therefore, the steel after normalizing treatment at 950℃ for 5min can get the idealmicrostructure, which is conducive to the subsequent cold rolling deformation and microstructure control.