The Role of Recoil Pressure in Thermodynamic Behaviors of Molten Pool during Selective Laser Melting

被引：0
|
作者：
Yuan W. [1 ]
Chen H. [1 ,2 ]
Wei Q. [1 ]
机构：
[1] State Key Lab of Materials and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan
[2] Department of Mechanical Engineering, National University of Singapore, Singapore
来源：
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | 2020年 / 56卷 / 07期
关键词：
Depression; Molten pool; Recoil pressure; Selective laser melting; Surface morphology;
D O I：
10.3901/JME.2020.07.213
中图分类号：
学科分类号：
摘要：
During selective laser melting (SLM) process, the recoil pressure induced by metal evaporation affects the thermodynamic behaviors of molten pool, which may result in forming defects. Taking 316L stainless steel as an example, through computational and experimental methods, the effects of the recoil pressure on the thermodynamic behaviors of the molten pool are fully investigated. The established model is based on volume of fluid (VOF) multiphase theory with full consideration of recoil pressure combining ray-tracing heat source model. From the results, with a fixed laser linear energy density, the lager the laser scanning speed, the wider the molten pool range and larger the depression depth. With a fixed laser scanning speed (1.0 m/s), the larger the laser power, the larger depression depth, which further lead to elevated depth of molten pool, but the molten pool length along scanning direction, the width and surface morphology of solidified tracks change little. © 2020 Journal of Mechanical Engineering.
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页码：213 / 219
页数：6
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