轧制复合法制备硅浓度梯度高硅钢薄带的织构演变

Texture evolution during the process of preparation of gradient high silicon steel sheets produced by rolling bonding method

采用"热轧复合+冷轧减薄+退火"方法成功制备了0.20mm厚的硅浓度梯度高硅钢薄带,并采用SEM和X射线衍射技术对制备过程中组织和织构演变进行了研究。热轧复合板微观组织呈明显层状分布,复合界面为紧密冶金结合且经过83%的大冷轧变形未开裂。热轧和冷轧复合板带中均形成强α和γ织构,再结晶退火后形成强γ织构。冷轧和退火织构沿板厚呈显著的梯度分布特征,其主要来自于复合界面两侧硅浓度和初始热轧织构的差异性以及冷变形的不均匀性。

Gradient high silicon steel thin sheets with thickness of 0.20 mm were successfully produced by the rolling and annealing method,including hot rolling bonding,cold rolling,and annealing.Microstructure and texture evolution was investigated by means of SEM and X-ray diffraction.Microstructure of hot-rolling-bond-ing shows obviously layered distribution,the composite interface was closely metallurgical bonding and no cracking appears even after 83% cold rolling.Strongαand γfibers develop in the hot and cold rolled state,andγ fiber dominates the recrystallization texture.Cold rolling and annealing texture was gradient distribution through the thickness,which can be attributed to the difference of chemical composition and initial hot-rolled texture on either side of the composite interface as well as the inhomogeneity of cold deformation.