激光熔覆制备GH4169材料的工艺及性能研究

Study on Material Properties of GH4169 by Laser Additive Manufacturing

采用激光熔覆制造GH4169合金材料,并测试材料熔覆后拉伸性能。选择GH4169合金锻件为基体材料,GH4169球形粉末为粉末材料,通过对比实验,获得了镍基高温合金GH4169材料最佳激光熔覆工艺参数。根据最佳工艺参数,通过激光熔覆制备GH4169合金拉伸试样,对试样进行双时效热处理,然后进行静载力学拉伸实验,分析热处理后材料机械物理力学性能。研究结果表明:在激光功率1400 W、扫描速度6 mm/s、送粉量9 g/min工艺参数下,熔覆层枝晶细密且分布均匀;热处理后成形层屈服强度变为1052 MPa,抗拉强度变为1314 MPa,断后延伸率为12.5%,静载力学性能大幅改善。

The GH4169 alloy material was fabricated by laser cladding and the tensile properties of the material were tested after cladding.The GH4169 alloy forging was selected as the matrix material and the GH4169 spherical powder as the powder material,and the best laser cladding process parameters of nickel-based super alloy GH4169 material were obtained through comparative experiments.According to the best process parameters,the tensile specimen of GH4169 alloy was prepared by laser cladding,and the specimen was subjected to double aging heat treatment,and then the static load mechanical tensile experiment was carried out to analyze the mechanical and physical properties of the material after heat treatment.The results show that under the process parameters of laser power of 1400 W,scanning speed of 6 mm/s and powder delivery capacity of 9 g/min,the dendrites of the cladding layer are fine and uniformly distributed,and the yield strength of the formed layer becomes 1052 MPa,the tensile strength becomes 1314 MPa,the elongation after breaking is 12.5%,and the static mechanical properties are greatly improved.