选区激光熔化工艺参数对Co-25Cr-5Mo-5W合金结构与性能的影响

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Abstract The Co-25Cr-5Mo-5W alloys were fabricated by selective laser melting (SLM) technique using gas atomization Co-25Cr-5Mo-5W powders as raw materials. The effects of the laser power, scanning speed, scanning space and laser energy density on the phase composition, microstructure and mechanical properties of SLM-ed Co-25Cr- 5Mo-5W alloys were investigated systematically by combining XRD, SEM, TEM and tensile testing. The results show that the laser power is positively associated with the sintering density of SLM Co-25Cr-5Mo-5W alloys. In contrast, it is negatively associated with the scanning speed (excluding 300 mm/s) and scanning space. The γ(fcc) and ε(hcp) phases are observed in the SLM Co-25Cr-5Mo-5W alloys. They present SN (Shoji-Nishiyama) orientation relationship The fine and uniform columnar crystals, cellular crystal and nanosized carbide precipitates result in the improvement of the mechanical properties of SLM-ed alloy. Co-25Cr-5Mo-5W alloys by SLM with high strength and good ductility are achieved when the laser power, the scanning speed, the scanning space and the laser energy density are 160 W, 400 mm/s, 0.07 mm, and 190.4 J/mm³, respectively. The relative density, tensile strength, yield strength and elongation are 98.6%, 1 284 MPa, 934 MPa, and 16% respectively.

Key words： Co-25Cr-5Mo-5W alloy selective laser melting process parameters mechanical properties microstructure

Received: 16 March 2018 Published: 19 July 2019

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	HUANG Zonglian
	WANG Bo
	LIU Fei
	MA Qing
	LIU Shaojun

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HUANG Zonglian,WANG Bo,LIU Fei, et al. Effects of processing parameters on microstructure and mechanical properties of Co-25Cr-5Mo-5W alloys by selective laser melting[J]. Materials Science and Engineering of Powder Metallurgy, 2018, 23(6): 582-590.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2018/V23/I6/582

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