激光沉积修复GH4169 合金强度与塑性仅达到铸件标准Q/5B 453-1995，热处理是改善其力学性能的重要手段。研究了不同热处理工艺对激光沉积修复GH4169合金显微组织和拉伸性能的影响规律，结果表明：激光沉积修复GH4169 合金试样经直接时效热处理后，与沉积态相比，枝晶间的Laves 相少量熔解，拉伸强度提高，与锻件标准Q/3B 548-1996(高强)相当，而塑性略有下降；且随着时效时间的延长，试样拉伸强度与塑性没有提高。修复试样经固溶处理后，Laves 相部分熔解，并在其周围析出大量针状δ相，拉伸强度达到锻件标准，断后伸长率比沉积态提高21%；修复试样经均匀化处理后，Laves相基本熔解，在晶界及晶内均析出了δ相，拉伸强度接近锻件标准，断后伸长率超过了锻件标准27.1%。试验表明合适的热处理能有效提高激光沉积修复GH4169合金的强度与塑性。

Strength and plasticity of laser deposition repair GH4169 alloy reach only the casting standard Q/5B 453- 1995. Heat treatment is an important method to improve the mechanical property. The effects of heat treatment on the microstructure and mechanical properties of laser deposition repair GH4169 alloy are investigated. As compared with as-deposited (AD) samples, after the direct aged (DA) heat treatment for laser deposition repair GH4169 alloy, the interdendritic Laves phase is slightly dissolved, the tensile strength of DA samples increase obviously, equaling to the wrought standard of Q/3B548-1996 at room temperature, however, the plasticity of DA samples decreases slightly. The strength and plasticity of DA samples is not improved when prolonging aged time. The solution heat treatment results in further dissolution of Laves phase and precipitation of a large number of needle d phase around it, the tensile strength of the solution samples reach the wrought standard, the elongation after fracture increase by 21% compared with as- deposited samples. The homogenization heat treatment results in almost entirely dissolution of Laves phase, and the d phase is precipitated in the grain and grain boundary, the tensile strength of the homogenization samples is roughly equivalent to the wrought standard, the elongation after fracture surpassed the wrought standard by 27.1%. The results show that the strength and plasticity of laser deposition repair GH4169 alloy can be effectively improved by the suitable heat treatment.