电子束选区熔化制备纯钼块体的组织与性能

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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

Received: 06 August 2020 Published: 18 January 2021

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TG146.4

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	LI Huixia
	ZHU Jilei
	TAN Yannni
	LIU Bin
	CHEN Rui
	ZHAO Pei
	YI Yang

Cite this article:

LI Huixia,ZHU Jilei,TAN Yannni, et al. Microstructure and properties of pure molybdenum block prepared by selective electron beam melting[J]. Materials Science and Engineering of Powder Metallurgy, 2020, 25(6): 497-504.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2020/V25/I6/497

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