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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摘要采用激光选区熔化成形工艺制备CoCrWMo合金,将合金在1 200 ℃固溶1 h后再分别在600,700,750,800和900 ℃下时效10 h,研究固溶-时效处理对合金组织与性能的影响。结果表明,SLM成形态CoCrWMo合金由FCC的γ相和HCP的ε相马氏体组成。在固溶时效过程中,发生γ相(FCC相)向ε相(HCP相)的转变,随时效温度升高,ε相马氏体含量增加,同时析出沉淀物M₂₃C₆(M=Cr,Mo,W)。在750 ℃时效的合金中,ε相比例为77%,表明时效处理可促进FCC→HCP马氏体的相变,所有时效态合金的显微硬度均明显高于固溶态合金的硬度。在750 ℃时效的合金,在兼顾伸长率的同时,强度提高,抗拉强度和屈服强度分别为1 076 MPa和820.8 MPa,伸长率达10.5%。

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	班乐
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	吴苑标
	肖志瑜

关键词 ： CoCrWMo合金, 固溶时效, 激光选区熔化, 显微组织, 力学性能

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

收稿日期: 2019-10-22 出版日期: 2020-06-19

ZTFLH:	TG166.7
	TF124

基金资助:国家自然科学基金重大仪器项目(51627805); 广东省自然科学基金团队项目(2015A030312003); 广东省科技项目(2014B010129003,2017B090901025)

通讯作者: 肖志瑜,教授,博士。电话：13922266121;E-mail: zhyxiao@scut.edu.cn

引用本文:

班乐, 黄嘉豪, 毛卫东, 吴苑标, 肖志瑜. 固溶时效处理对SLM成形CoCrWMo合金组织与性能的影响[J]. 粉末冶金材料科学与工程, 2020, 25(1): 27-34.
BAN Le, HUANG Jiahao, MAO Weidong, WU Yuanbiao, XIAO Zhiyu. Effect of solution-aging treatment on the microstructure and properties of selective laser melted CoCrWMo alloys. Materials Science and Engineering of Powder Metallurgy, 2020, 25(1): 27-34.

链接本文:

http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2020/V25/I1/27

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