随着循环处理次数的增加，试验钢晶粒基本呈细化趋势，当循环次数达到两次及以上时，所得组织晶粒尺寸均比常规处理的要细小，其中循环处理三次时，晶粒已细化到4μm左右，继续增加循环次数，晶粒又有所粗化。

With the increase of the number of cycles, the grain size of the test steel basically shows a refining trend. When the number of cycles reaches two or more, the grain size of the obtained microstructure is smaller than that of the conventional treatment. When the number of cycles is three, the grain size has been refined to 4 μ About m, continue to increase the number of cycles, and the grain coarsens again.