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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。
Laser deposition repair GH4169 alloy strength and ductility only to cast the standard Q / 5B 453-1995, heat treatment is an important means to improve its mechanical properties. The effects of different heat treatment processes on the microstructure and tensile properties of GH4169 alloy by laser deposition were studied. The results show that laser heat treatment of GH4169 alloy after heat treatment by direct-acting heat treatment compared with the deposited state, the interdendritic Laves phase A small amount of melting, tensile strength increased, and the forging standard Q / 3B 548-1996 (high strength), while the plastic slightly decreased; and with the aging time, the tensile strength and plasticity of the sample did not increase. After the sample was treated by solution treatment, the Laves phase was partially melted and a large number of needle-like δ phases were precipitated around it. The tensile strength reached the forging standard, and the elongation at break was increased by 21% compared with the deposited state. The repaired sample was homogenized After that, the Laves phases are basically melted and the δ phases are precipitated both in the grain boundaries and in the grains. The tensile strength approaches the forging standard, and the elongation after fracture exceeds the forging standard of 27.1%. Experiments show that proper heat treatment can effectively improve the strength and ductility of GH4169 alloy by laser deposition.