雾化压力对选区激光熔化用Inconel 625合金粉末粒度与形貌的影响

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Abstract Inconel 625 alloy powders for selective laser melting were prepared by vacuum induction furnace melting-high purity argon atomization with atomization pressure of 3.5-5.0 MPa. The particle size distribution and morphology of the powders were characterized by scanning electron microscopy. At the same time, the yield of 45-105 μm granular powder with different atomization pressure was calculated. The results show that the particle size distribution of Inconel 625 alloy powder prepared by vacuum atomization is lognormal distribution, and the curve of particle size distribution has obvious double peaks, which conforms to the secondary breaking mechanism of gas atomization powder. With increasing atomized gas pressure, the particle size becomes finer and the powder yield in the target section increases, but when the atomizing pressure exceeds 4.5 MPa, the particle size changes insignificantly. Furthermore, with the atomization pressure increasing, the more satellite will be produced, and the sphericity of the powder will decrease. And the optimum value of atomization pressure is 4.5 MPa. The average diameter d_m of the powder is 72.2 μm, and the yield of 45-105 μm granular powder is 78.1%. The sphericity of the powder is good, which fully meets the requirements of selective laser melting equipment for powder.

Key words： vacuum induction gas atomization Inconel 625 metal powder particle distribution morphology

Received: 29 November 2018 Published: 12 July 2019

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TG142.71

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	Articles by authors
	LI Xiang
	ZENG Keli
	HE Pengjiang
	LUO Hao
	ZONG Wei
	SONG Xinqiang
	ZHU Jie

Cite this article:

LI Xiang,ZENG Keli,HE Pengjiang, et al. Effect of atomization pressure on particle size and morphology of Inconel 625 alloy powder for selective laser melting[J]. Materials Science and Engineering of Powder Metallurgy, 2019, 24(4): 374-378.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2019/V24/I4/374

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