能量密度对选区激光熔化纯钨致密度及组织性能的影响

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Abstract Some refractory metals are widely used in the fields of weaponry, communication and medical fields due to their high melting point, low steam pressure and excellent high temperature strength. Using selective laser melting (SLM) technique to print pure tungsten can solve the problems of traditional powder metallurgy technology for some complicated shapes and ultra-fine grains. The effects of energy density of SLM on the density, hardness and microstructure of the pure tungsten were studied. The results show that the density and microhardness increase with the increase of volumetric energy density (VED). The maximum relative density can reach 75%, and the microhardness reaches 485 HV, far more than traditional powder metallurgy (260 HV). The microstructure after SLM is a fine equiaxed grain with the grain size less than 1μm.

Key words： energy density tungsten selective laser melting hardness microstructure

Received: 09 May 2018 Published: 12 July 2019

ZTFLH:

TG146.411

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	Articles by authors
	NIU Pengda
	LI Ruidi
	YUAN Tiechui
	WANG Minbo

Cite this article:

NIU Pengda,LI Ruidi,YUAN Tiechui, et al. Effects of selective laser melting energy density on density and microstructure and properties of pure tungsten[J]. Materials Science and Engineering of Powder Metallurgy, 2019, 24(1): 15-20.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2019/V24/I1/15

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