Selective laser melting (SLM) of AISI 316L-impact of laser power, layer thickness, and hatch spacing on roughness, density, and microhardness at constant input energy density

被引:117
作者
Greco, Sebastian [1 ]
Gutzeit, Kevin [1 ]
Hotz, Hendrik [1 ]
Kirsch, Benjamin [1 ]
Aurich, Jan C. [1 ]
机构
[1] TU Kaiserslautern, Inst Mfg Technol & Prod Syst, Gottlieb Daimler Str, D-67663 Kaiserslautern, Germany
关键词
Additive manufacturing; Selective laser melting; Input energy density; Relative density; Microhardness; STAINLESS-STEEL PARTS; MECHANICAL-PROPERTIES; BEHAVIOR; POWDER; MICROSTRUCTURE; QUALITY;
D O I
10.1007/s00170-020-05510-8
中图分类号
TP [自动化技术、计算机技术];
学科分类号
0812 ;
摘要
In selective laser melting (SLM) the variation of process parameters significantly impacts the resulting workpiece characteristics. In this study, AISI 316L was manufactured by SLM with varying laser power, layer thickness, and hatch spacing. Contrary to most studies, the input energy density was kept constant for all variations by adjusting the scanning speed. The varied parameters were evaluated at two different input energy densities. The investigations reveal that a constant energy density with varying laser parameters results into considerable differences of the workpieces' roughness, density, and microhardness. The density and the microhardness of the manufactured components can be improved by selecting appropriate parameters of the laser power, the layer thickness, and the hatch spacing. For this reason, the input energy density alone is no indicator for the resulting workpiece characteristics, but rather the ratio of scanning speed, layer thickness, or hatch spacing to laser power. Furthermore, it was found that the microhardness of an additively manufactured material correlates with its relative density. In the parameter study presented in this paper, relative densities of the additively manufactured workpieces of up to 99.9% were achieved.
引用
收藏
页码:1551 / 1562
页数:12
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