Optimization of process parameters for selective laser melting of Cu-Cr-Nb alloy
REN Yake1, LIU Zuming1, ZHANG Yazhou1, AI Yongkang1, YE Shupeng1, LI Jian1, PENG Weicai2
1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China; 2. Changsha Mitr Instrument Equipment Co., Ltd., Changsha 410219, China
Abstract：Cu-1.93Cr-0.74Nb (mole fraction, %) alloy was prepared by selective laser melting (SLM) using Ar-gas atomized powders. The effects of laser power, scanning speed and scanning spacing on the relative density, molten pool morphology, and microstructure of as-built samples were investigated. The results show that the effects of SLM process parameters on the relative density, metallurgical defects and microstructure of as-built Cu-1.93Cr-0.74Nb alloy are nonlinear. The relative density of as-built sample increases first and then decreases with increasing the laser power from 300 W to 400 W, or the scanning speed from 500 mm/s to 1 100 mm/s. The number and size of pore also shows a similar change rule. The relative density is closely related to the continuity of melting pool, the number and size of pore. The relative density of as-built Cu-1.93Cr-0.74Nb alloy prepared by optimum parameters of the laser power of 330 W, the scanning speed of 800 mm/s and the scanning space of 0.1 mm, reaches 99.3%. It has a bimodal core-shell structure and a strong {110} texture with a large-sized grain as the center and fine grains distributed on the shell. The texture index and texture strength are 9.319 and 7.812, respectively.
任亚科, 刘祖铭, 张亚洲, 艾永康, 叶书鹏, 李建, 彭伟才. Cu-Cr-Nb合金选区激光熔融工艺参数优化[J]. 粉末冶金材料科学与工程, 2022, 27(1): 66-76.
REN Yake, LIU Zuming, ZHANG Yazhou, AI Yongkang, YE Shupeng, LI Jian, PENG Weicai. Optimization of process parameters for selective laser melting of Cu-Cr-Nb alloy. Materials Science and Engineering of Powder Metallurgy, 2022, 27(1): 66-76.
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2022, Vol. 27 
