用再结晶法制取晶粒直径从22至262μm的硅钢试片,拉伸过程用声发射监听。测得屈服阶段声发射振铃计数随晶粒直径的变化关系与晶界面积随晶粒直径的变化关系有相同的趋势,说明实验所用硅钢试样的屈服以晶界发射位错为主。高幅度声发射信号所占比重随晶粒直径增大而增大,认为这是位错滑移自由程增大的结果。 The recrystallization method was used to prepare silicon steel specimens with crystal grain diameter from 22 to 262μm. The stretching process was monitored by acoustic emission. It is found that the relationship between the ringing count of the acoustic emission and the grain diameter at the yielding stage is similar to the change of the grain boundary area with the grain diameter, indicating that the yield of the silicon steel sample used in the experiment is dominated by the grain boundary emission dislocation. The proportion of high-amplitude acoustic emission signals increases with the increase of grain diameter, which is considered as the result of the increasing free-path of dislocation slip.