电子束选区熔化制备纯钼块体的组织与性能

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摘要采用电子束选区熔化技术制备纯钼块体,采用化学分析法、金相显微镜、分析天平及显微硬度计对纯钼块体的杂质元素含量、显微组织、密度和显微硬度进行测试。结果表明：采用电子束选区熔化成形技术制备的纯钼块体中C、O、N和H等杂质元素增量小于0.001%。一次熔化成形的纯钼块体显微组织中,沿沉积方向呈粗大柱状晶,并且沿晶界存在少量微裂纹。而通过二次熔化工艺,可以细化晶粒,抑制微裂纹生长。较优的电子束二次选区熔化成形工艺为：一次熔化电流12 mA、熔化速度0.6 m/s;二次熔化电流12 mA,熔化速度0.89 m/s。该工艺下成形的纯钼块体致密度达99%以上(密度(10.15±0.13) g/cm³),硬度(HV_0.2)在185~200之间,无明显各向异性。

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	李会霞
	朱纪磊
	谭彦妮
	刘彬
	陈睿
	赵培
	弋阳

关键词 ：钼, 电子束选区熔化, 二次熔化, 显微组织, 致密度, 显微硬度

Abstract：The block of pure molybdenum was fabricated for the first time by selective electron beam melting. Its impurities, microstructure, density and micro-hardness were tested using chemical analysis, metallurgical microscopy, chemical balance and microhardness tester. The results show that the impurity increments of the as-build pure molybdenum such as C, N, O and H are not more than 0.001%. Using a single-melting process, the microstructure of pure molybdenum along the deposition direction present scoarse columnar crystal characteristics, and there are a few microcracks along the columnar grain boundary. Using a double-melting process, the grain size is refined and the microcrack phenomenon is suppressed. The better selective electron beam double-melting process is as follows: the primary melting current is 12 mA, and the velocity is 0.6 m/s; the secondary melting current is 12 mA, and the velocity is 0.89 m/s. Under the better process, the relative density of the as-build pure molybdenumblock is higher than 99% with a density of (10.15±0.13) g/cm³. The microhardness (HV_0.2) is 185-200 and shows no anisotropy.

Key words： molybdenum selective electron beam melting double-melting microstructure relative density microhardness

收稿日期: 2020-08-06 出版日期: 2021-01-18

ZTFLH:

TG146.4

基金资助:中南大学粉末冶金国家重点实验室资助项目; 广东省重点领域研发计划项目(2019B09090400)

通讯作者: 李会霞,助理工程师,硕士。电话：19991977545;E-mail: 781295125@qq.com

引用本文:

李会霞, 朱纪磊, 谭彦妮, 刘彬, 陈睿, 赵培, 弋阳. 电子束选区熔化制备纯钼块体的组织与性能[J]. 粉末冶金材料科学与工程, 2020, 25(6): 497-504.
LI Huixia, ZHU Jilei, TAN Yannni, LIU Bin, CHEN Rui, ZHAO Pei, YI Yang. Microstructure and properties of pure molybdenum block prepared by selective electron beam melting. Materials Science and Engineering of Powder Metallurgy, 2020, 25(6): 497-504.

链接本文:

http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2020/V25/I6/497

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