以2.9%Si＋0.7%Al无取向硅钢热轧板为初始材料,利用金相显微术、EBSD、XRD对比研究了常化处理/不常化处理对后续组织、织构演变以及磁性能的影响,分析了常化处理对各厚度层织构演变的影响。结果表明,常化处理改善了冷轧前组织的均匀性并弱化了热轧变形织构。与不常化处理相比,常化处理使最终成品板的晶粒尺寸增大,使各厚度层的γ纤维织构减弱、λ纤维织构增强,从而使磁性能得到明显改善。通过适当提高常化处理温度来增大晶粒尺寸,有助于成品板获得更大的晶粒尺寸,并在各厚度层形成更弱的γ纤维织构以及更强的Goss织构、λ纤维织构,使磁性能得到大幅改善。另外,发现在热轧、常化、冷轧、退火板的厚度方向上均存在明显的织构梯度。
Effects of normalizing on microstructure, texture and magnetic properties of the hot rolled 2.9% Si-0. 7% A1 non-oriented silicon steel sheets were investigated by using optical microscopy, EBSD and XRD. Emphasis was put on the effects of normalizing on texture evolution in the sheet thickness. The results show that the microstructure homogeneity prior to cold rolling is improved and the hot rolling texture is weakened by normalizing. The final product sheet shows bigger grain size, weaker γ-fiber and stronger A-fiber texture through the sheet thickness in comparison with the sheets without normalizing. Furthermore, the grain size prior to cold rolling can be increased by properly increasing the normalizing temperature, thus the final sheets present bigger grain size, weaker γ-fiber, stronger Goss and A-fiber texture through the sheet thickness and much better magnetic properties. Obvious texture gradient is observed along the sheet thickness of the hot-rolled, normalized, cold-rolled and the finally annealed sheets.
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