为研究激光冲击强化对K4030合金叶片疲劳性能的影响，对K4030合金片进行了激光冲击强化，并对强化后的试样进行了表面粗糙度、残余应力、微观组织和显微硬度测试，对叶片进行了复合疲劳试验。测试结果表明，冲击强化前后试样的表面粗糙度没有明显变化；试样在距离材料表面1 mm的深度内产生大于450 MPa的残余压应力；试样冲击强化区内晶界处的晶粒得到了细化；试样在距离表面0.8 mm深度内的显微硬度得到了提高，且表面的显微硬度提高了16%。疲劳试验结果表明，激光冲击强化可显著提高K4030合金叶片的复合疲劳安全寿命。

To discover how laser shock processing (LSP) affects the fatigue property of the blade made of K4030 alloy, the samples cut from blades and blades made of K4030 are laser shock processed , then the microstructure, micro-hardness, residual compressive stress and surface roughness of the samples are tested, and the fatigue life of the blades as well. The test results show that no obvious change of the surface roughness is found；a residual compressive stress more than 450MPa is developed in a depth of 1mm from the surface; some grains are observed refined in the grain boundary of shock region；the micro-hardness improves in a depth of 0.8mm from the surface， and the surface micro-hardness improves 16%. Fatigue test result shows the life of blade made of K4030 alloy is improved visibly after it is laser shock processed. So it is feasible to improve the fatigue life of K4030 blade using laser shock processing.