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Materials Science and Engineering of Powder Metallurgy >

2022 , Vol. 27 >Issue 1: 66 - 76

DOI: https://doi.org/10.19976/j.cnki.43-1448/TF.2021052

Engineering and Technology

Optimization of process parameters for selective laser melting of Cu-Cr-Nb alloy

  • REN Yake ,
  • LIU Zuming ,
  • ZHANG Yazhou ,
  • AI Yongkang ,
  • YE Shupeng ,
  • LI Jian ,
  • PENG Weicai
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  • 1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
    2. Changsha Mitr Instrument Equipment Co., Ltd., Changsha 410219, China

Received date: 2021-06-02

  Revised date: 2021-09-26

  Online published: 2022-02-28

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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.

Key words： Cu-Cr-Nb alloy; selective laser melting; optimization of process parameters; microstructure; core-shell structure with bimodal grain size

Cite this article

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[J]. Materials Science and Engineering of Powder Metallurgy, 2022 , 27(1) : 66 -76 . DOI: 10.19976/j.cnki.43-1448/TF.2021052

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