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| 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 |
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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.
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Received: 02 June 2021
Published: 28 February 2022
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2022, Vol. 27 
