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Computational Analysis of Thermo-Fluid Dynamics with Metallic Powder in SLM

机译：SLM中金属粉末热流体动力学的计算分析

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摘要

Selective Laser Melting (SLM) is a powder bed additive manufacturing (AM) process. The metallic powder particles are subject to melting-solidifying along each line scanning which consequently results in intense thermo-capillary convection within the melt pool. Therefore, in order to accurately capture the fluid dynamics, discrete powder particles should be properly modelled. In this study, a 3D thermo-fluid model using the volume of fluid approach with powder particles incorporated was developed using ANSYS/FLUENT. A sequential powder adding algorithm was utilized to generate randomly dispersed particles of a given size distribution in a powder bed. As a result of continuous melting and solidification, the temperature distribution, the molten metal flow, and the free-surface formation can be numerically analyzed. The influence of sequential addition of powder particles to the transport phenomena can be studied and the mechanisms of different pore formation investigated. When the powder particles are melted, the formed melt pool would solidify to form the single track and its density depends on the process parameters. The high speed, 1600 mm/s, of laser would result in less dense tracks with numerous pores would further aggravate with increasing layers.
机译：选择性激光熔化（SLM）是粉末床增材制造（AM）工艺。金属粉末颗粒沿着每条线扫描进行熔融固化，因此导致熔池内强烈的热毛细管对流。因此，为了准确地捕获流体动力学，应该对离散的粉末颗粒进行正确建模。在这项研究中，使用ANSYS / FLUENT开发了一种使用体积流体法并入粉末颗粒的3D热流体模型。利用顺序粉末添加算法在粉末床上生成给定尺寸分布的随机分散颗粒。通过连续熔化和固化，可以对温度分布，熔融金属流动和自由表面形成进行数值分析。可以研究相继添加粉末颗粒对传输现象的影响，并研究不同孔形成的机理。当粉末颗粒熔化时，形成的熔池将凝固形成单轨，其密度取决于工艺参数。 1600毫米/秒的高速激光将导致具有许多孔的密度较小的轨道，并随着层数的增加而进一步加剧。

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