择优蚀坑表征立方晶系冷轧电工硅钢取向性

为确定电工硅钢的晶粒取向性,应用蚀坑技术研究了冷轧无取向硅钢、取向硅钢因择优腐蚀所形成的蚀坑与晶粒取向的关系,分析了{100}面系蚀坑形貌的演变过程,从晶体学角度建立了蚀坑形貌与晶面指数的对应关系.结果发现:无取向硅钢形成不同形貌的蚀坑,其晶面指数为(001)、(011)和(111),或是由它们演变形成的其他晶面指数;取向硅钢形成的蚀坑为同一类型,晶面指数为(011)或由其演变形成的其他晶面指数;晶界也会形成蚀坑,其形貌与相邻晶粒间的取向差有关,取向差大,形成{100}、{110}和{111}面系的蚀坑,取向差小,形成{110}面系的蚀坑.取向硅钢的蚀坑分布具有连续性,晶界的存在并不改变蚀坑的基本特征;取向硅钢蚀坑的底棱相互平行,相差不超过5°,底棱延伸方向与硅钢的轧制方向即001]方向一致,偏离角度不超过5°.

Grain orientation characterization of cold-rolled electrical steel sheets in the cubic crystal system by etch figures

In order to determine the value of import, the tax collecting and perform different ways of supervision regulations according to the grain orientation characterization of the electrical steel sheets, the etch figures of cold-rolled electrical steel sheets based on the preferential etch behavior were investigated by means of etch figure method. The relationships between the etch figures and grain orientation were analyzed from the viewpoint of crystallography. The results show that the geometric morphology of the etch figures on the rolling surface is disordered orientation for the non-oriented electrical steel sheets, and their corresponding miller indexes are (001), (011) and (111), respectively, and other miller indexes by their evolution formation. On the rolling surface of the grain-oriented electrical steel sheets, the etch figures are regular geometric morphology, miller index is (011), or other miller indexes by the evolution formation. The morphology of etch figures on the grain boundary related to the orientation difference between the adjacent grain, big orientation difference, will form {100}, {110} and {111} crystal system of etch figures, whereas if small, will form {110} crystal system of etch figures. For grain-oriented steel sheets, the geometric morphology of etch figures is not affected by the grain boundary. The basal edges of the etch figures are parallel each other, and the deviation angle is less than 5 degrees. Their basal edges, extending direction are same as the rolling direction of the steel sheets, and the deviation angle shall not exceed 5 degrees also.