针对K24镍基铸造合金材料表面粗糙度大引起吸收保护层贴合不紧密的问题,提出采用无保护层激光冲击(LSPw C)方法对K24合金进行强化,利用高周疲劳实验验证其强化效果,并从残余应力、微观组织方面讨论疲劳性能改善机理。实验结果表明:相对于原始叶片,LSPw C后的模拟叶片的疲劳强度提高16%,保温后疲劳强度提高11%。LSPw C在试样表层诱导产生高幅值残余压应力和高密度位错,从而提高模拟叶片的疲劳性能;保温后,大部分残余压应力发生松弛,位错结构具有较好的热稳定性,这是保温后模拟叶片疲劳性能提高的主要原因。 Aiming at the problem that the surface roughness of K24 nickel-based cast alloy material causes the absorption coating to be not close together, the method of unprotected laser shock (LSPw C) is proposed to strengthen K24 alloy and the strengthening effect is verified by high cycle fatigue test. And from the residual stress and microstructure aspects to discuss fatigue performance improvement mechanism. The experimental results show that the fatigue strength of simulated leaves after LSPw C is increased by 16% compared with the original leaves, and the fatigue strength after insulation is increased by 11%. LSPw C induces high-amplitude residual compressive stress and high-density dislocation on the surface of the specimen, thus improving the fatigue performance of the simulated leaves. After the heat preservation, most of the residual compressive stress relaxes and the dislocation structure has good thermal stability, This is the main reason for the simulated leaf fatigue performance after heat preservation.