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| Effect of selective laser melting parameters on microstructure and mechanical properties of CoCrWMo alloy |
| ZHAO Xiaohao1，ZHANG Peng1，PAN Feifei1，GUO Shaoshuai1，LIU Like2，
LIANG Shujin1，3 |
| （1. Sino-Euro Materials Technologies of Xi′an Co., Ltd, Xi′an 710018, China;2. Shaanxi Medical Device
Quality Institute, Xianyang 712046, China; 3. Northwest Institute for Non-ferrous Metal Research, Xi′an
710016, China） |
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Abstract Selective Laser Melting is widely applied to dental restoration. In this paper, different sets of laser
power and varying scanning velocity were investigated. Optical microscopy (OM), scanning electron microscopy
(SEM), energy dispersive spectrometer (EDS) and Image Pro Plus (IPP) were exploited to analyze microstructure
and constituent phases. Tensile testing was performed to evaluate corresponding performance. The prime set of
parameters have been selected from 15 parameter sets. The prime set possessed excellent combination of strength
and ductility while the elongation is up to 20% with dimples characterization. The ultimate tensile strength and
yield strength was (1 066±33) MPa and (849±30) MPa, respectively. The microstructure is composed of γ -fcc
phase, of which the percentage is over 95%. During printing, most of porosity surpassed 0.2% in relative low
energy density（19.5~26.0）J/mm3. On the contrary, high energy density（26.0~36.5）J/mm3 tends to obtain lower porosity which is below 0.1%. The experiment displays porosity is deeply corresponding to printing parameters,
like laser power and scanning velocity, rather than energy density.
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Received: 25 May 2022
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Corresponding Authors:
潘霏霏（1995—），女，学士，助理工程师，主要研究方向为钛合金、高温合金、钴铬合金的热等静压和激光增材制造工艺及研究。
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2023, Vol. 33 
