When the strain is below 0.29, the average grain size decreases obviously with the increase of strain.
当应变小于0.29时，平均晶粒尺寸明显地随应变增大而减小；
Nevertheless, after the strain reaches 0.29, the average grain size decreases slowly with the increase of strain.
当应变达到0.29时，平均晶粒尺寸缓慢地随应变增大而减小。
The relationship between the average diameter of mill balls and the average grain size of grinding materials in ball mill is analyzed.
介绍研磨体级配的平均球径与研磨物料平均粒径的关系。
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