Ultrasonic impact treatment (UIT) was carried out on three specimens with different strengths and, to measure the subsurface stress distribution of the specimens, the layer-by-layer removal x-ray diffraction method was applied. The stress redistribution due to material removal was corrected by finite element analysis. The effect of material strength on the after-UIT subsurface stress was investigated. The results show that the UIT can cause a compressive stress layer with a depth of over 2.5 mm for specimens with different strengths, while the material strength has no significant effect on the depth of UIT-induced stress. The UIT-induced peak compressive stresses in the three specimens exceed the material yield strength, appearing at the depth of 0.2 mm beneath the surface and increasing with the increase of material yield strength. The ratio of UIT-induced peak compressive stress magnitude to material yield strength decreases with the increase of material yield strength.

对三个强度不同的试样进行了超声波冲击处理（UIT），并采用逐层去除x射线衍射法测量试样的表面应力分布。由于材料去除而产生的应力重新分布已通过有限元分析进行了校正。研究了材料强度对UIT后次表面应力的影响。结果表明，对于不同强度的试样，UIT会引起深度超过2.5 mm的压应力层，而材料强度对UIT诱导的应力深度没有显着影响。三个样品中由UIT引起的峰值压缩应力超过材料屈服强度，出现在表面下方0.2 mm的深度处，并随材料屈服强度的增加而增加。