The ratios of microhardness to proof stress are all about 3.37 in different depths of the affectedlayer.
喷丸影响层不同部位的显微硬度与条件屈服点之比约为3.37;
2
All these results show that severe plastic deformation occurred on the grinding surface, the strain strengthening is the basic reason for the increase of the yield strength in grinding affectedlayer.