激光选区熔化成型316L不锈钢的工艺参数对硬度与微观组织的影响

doi:10.11896/cldb.20070232

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Abstract Complex integrated space components can be manufactured by selective laser melting (SLM) technology, which is a major method of metal additive manufacturing. However, SLM technology still has some problems, such as the complexity of influence law of process para-meters on performance etc., which greatly limits the promotion and application of SLM technology. Therefore, the four SLM process parameters of laser power, scanning speed, scanning pitch and rotation angle between adjacent layers were selected for analysis in this paper. Orthogonal experiments were designed to manufacture 316L stainless steel samples, and the dimensional accuracy, relative density and hardness of the SLM formed specimens were characterized. The macrostructure and microstructure were observed. The laser energy density was taken as the dependent variable to study the influence on the properties of 316L stainless steel material, and the dimensionality reduction from multiple input va-riables to single input variables was realized, simplifying the complex influence rules of SLM process parameters on the mechanical properties and microstructure of the molding material. The results show that the relative density of 316L stainless steel was higher than 99.6% when the input laser energy density was between 65 J/m³ and 90 J/m³. When the laser power was 180 W and the scanning speed was 870 mm/s, the grain shape of 316L stainless steel was uniform, approximately hexagonal in shape, and the grain size reached 0.4 μm. There was a certain correlation between the relative density and hardness of 316L stainless steel formed by SLM. When the relative density was higher than 99.0%, the hardness of the sample was about 250HV.

Key words： selective laser melting 316L stainless steel process parameters dimensional accuracy microstructure

Published: 25 November 2021 Online: 2021-12-13

CLC number:

TG142

Fund:National Key R & D Program of China(2019YFB1311100), the National Natural Science Foundation of China (52005154,61802108) and the Natural Science Foundation of Hebei Province (E2020202035, E2017202296).

About author: Wenbin Jireceived his Ph.D. degree from the School of Mechanical Engineering of Shandong University in 2017. He is now a lecturer at the School of Mechanical Engineering of Hebei University of Technology and participates in the research of additive/subtractive hybrid manufacturing technology and high efficiency precision machining technology.

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	JI Wenbin
	XU Likui
	DAI Shijie
	ZHANG Zhengyan

Cite this article:

JI Wenbin,XU Likui,DAI Shijie, et al. Effect of Process Parameters on Hardness and Microstructure of 316L Stainless Steel Manufactured by Selective Laser Melting[J]. Materials Reports, 2021, 35(22): 22125-22131.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.20070232 OR http://www.mater-rep.com/EN/Y2021/V35/I22/22125

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