研究了基体预热对激光沉积修复GH4169合金试样的残余应力、组织和拉伸性能的影响。结果表明,基体预热至300℃的GH4169合金试样,残余应力x向分力σx的平均降幅为59.4 MPa,降低了11.7%。残余应力y向分力σy的平均降幅为189.7 MPa,降低了44.6%。沉积层枝晶间析出Laves相呈现颗粒状的碎化现象。抗拉强度和屈服强度与未预热的修复试样基本一致,断后伸长率为12.3%,提高了近一倍,达到锻件标准。试验表明基体预热可有效提高激光沉积修复GH4169合金的室温拉伸性能。 The effects of substrate preheating on the residual stress, microstructure and tensile properties of laser repaired GH4169 alloy were studied. The results show that for the GH4169 alloy preheated to 300 ℃, the average decrease of the residual stress component xx is 59.4 MPa, a decrease of 11.7%. The average residual stress y component σy decreased 189.7 MPa, a decrease of 44.6%. Deposition of dendritic precipitation of Laves phase showed grainy phenomenon. The tensile strength and yield strength are basically the same as that of the unheated repair sample. The elongation after break is 12.3%, nearly doubled to the forging standard. Experiments show that the matrix preheating can effectively improve the laser tensile properties at room temperature GH4169 alloy repair.