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Melt pool dimensions (depth: D and width: W) are strongly correlated with defects generated in laser powder bed fusion. The melt pool dimensions have been evaluated by CFD simulation including solid-liquid-gas phase change and laser multiple reflection. Such a multi-physics simulation requires a large number of parameters. Preliminary simulations for parameter identification require a lot of time and effort. The parameter sensitivity to the melt pool dimensions is important; however, the systematic evaluations have hardly been found in the literature. In this study, we performed systematic parametric evaluation for three parameters related to recoil pressure, flow resistance in solid-liquid mushy zone and Fresnel laser reflection. As a result, the D values increased with increasing recoil pressure, but theW values did not. The flow resistance force influenced the velocities in the mushy zone but not the melt pool dimensions. The D increased with increasing reflectivity, but theW did not. The melt pool dimensions varying recoil pressure, flow resistance force and reflectivity were all inconsistent with the experimental melt pool dimensions. In order to agree with the experimental melt pool dimensions, the problems to be solved were discussed by comparing the previous studies.

権利情報:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

キーワード: Laser powder bed fusion, Multi-physics CFD simulation, Recoil pressure, Mushy zone flow resistance, Fresnel laser reflection model, Melt pool shape

刊行年月日: 2023-09-11

出版者: Elsevier BV

掲載誌:

• Case Studies in Thermal Engineering (ISSN: 2214157X) vol. 50 103477

研究助成金:

• the Acquisition, Technology, and Logistics Agency(ATLA) JPJ004596

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1016/j.csite.2023.103477

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更新時刻: 2024-01-05 22:12:21 +0900

MDRでの公開時刻: 2023-10-10 13:44:08 +0900