固溶时效处理对SLM成形CoCrWMo合金组织与性能的影响

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Abstract The selective laser melted (SLM) CoCrWMo alloys were solution treated at 1 200 ℃ for 1 h, and then aged at 600, 700, 750, 800 and 900 ℃ for 10 h respectively. The effects of solution-aging treatment on the microstructure and properties of the alloy were studied. The results show that the SLM CoCrWMo alloy is composed of FCC γ phase and HCP ε phase martensite. The transformation from γ phase (FCC phase) to ε phase (HCP phase) occurs during solution- aging treatment. The content of ε phase martensite increases with increasing the aging temperature, M₂₃C₆(M=Cr,Mo,W) precipitated at the same time. In the alloy aged at 750 ℃, the proportion of ε phase is 77%, indicating that aging treatment can promote the transformation of FCC→HCP martensite. The microhardness of all aged alloys is significantly higher than that of solid solution alloys. The strength of the alloy aged at 750 ℃ is improved while the elongation is taken into account, the tensile strength and yield strength are 1 076 MPa and 820.8 MPa respectively, and the elongation reaches 10.5%.

Key words： CoCrWMo alloys solution-aging treatment selective laser melting microstructure mechanical properties

Received: 22 October 2019 Published: 19 June 2020

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	BAN Le
	HUANG Jiahao
	MAO Weidong
	WU Yuanbiao
	XIAO Zhiyu

Cite this article:

BAN Le,HUANG Jiahao,MAO Weidong, et al. Effect of solution-aging treatment on the microstructure and properties of selective laser melted CoCrWMo alloys[J]. Materials Science and Engineering of Powder Metallurgy, 2020, 25(1): 27-34.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2020/V25/I1/27

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