文章基本信息

标题：Computational investigation of thermal behavior and molten metal flow with moving laser heat source for selective laser melting process
本地全文：下载
作者：Patiparn Ninpetch ; Pruet Kowitwarangkul ; Sitthipong Mahathanabodee 等
期刊名称：Case Studies in Thermal Engineering
印刷版ISSN：2214-157X
电子版ISSN：2214-157X
出版年度：2021
卷号：24
页码：100860
DOI：10.1016/j.csite.2021.100860
出版社：Elsevier B.V.
摘要：Selective laser melting (SLM) process, which is one type of additive manufacturing (AM) processes, involves numerous complex physical phenomena such as heat transfer, molten metal flow, phase transformation, and Marangoni effect. These phenomena have significant effect on the final products quality. The aims of this research are to investigate the thermal behavior and molten metal flow characteristics, and to analyze the influence of the process parameters on scanning track formation. An integrated numerical modelling of discrete element method (DEM) and computational fluid dynamics (CFD) are applied. The results reveal that the molten metal backward flowed from the laser hot spot to the rear of the melt pool due to the surface tension gradient. The uniform tear-drop shape and high penetration scanning track occurred with laser power and scanning speed of 200 W and 1000 mm/s, 250 W and 1000 mm/s, and 250 W and 1200 mm/s. Moreover, the scanning track width and depth of all scanning speed levels, 1000 mm/s, 1200 mm/s, and 1500 mm/s, increased around 4–10 μm and 14–22 μm, respectively, with the increase in laser power of 50 W and reduced around 1–4 μm and 3–6 μm, respectively, per increasing in scanning speed of 100 mm/s.
关键词：Numerical modelling ; Additive manufacturing ; Selective laser melting ; Moving laser heat source ; Molten metal flow