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Investigation of thermal-fluid dynamics in directed energy deposition of 316 L stainless steel with laser beam oscillation

文献类型：期刊论文

作者Chen, Bo2,4; Dong BX(董斌鑫)2,4; Bian YH(边艳华)1,2,4; Li SX(李少霞)1,2,4; Tian CX(田崇鑫)1,2,4; He XL(何秀丽)1,2,3,4; Yu G(虞钢)1,2,3,4
刊名INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
出版日期2025-10-01
卷号249页码:18
关键词Directed energy deposition Laser beam oscillation Thermal behavior Fluid flow Dimensionless number
ISSN号0017-9310
DOI10.1016/j.ijheatmasstransfer.2025.127267
通讯作者He, Xiuli(xlhe@imech.ac.cn)
英文摘要The introduction of laser beam oscillation in directed energy deposition (DED-LBO) significantly influences the thermal-fluid behavior and molten pool formation during the process. This study presents a high-fidelity CFD model, integrated with a ray-tracing algorithm, to investigate the laser-material interaction and molten pool behaviors under linear and circular oscillation mode during the DED-LBO process of 316 L stainless steel. The results show that both the average interaction angle between the laser rays and the molten pool surface, as well as the laser absorptivity, vary periodically over time due to the periodic movement of the oscillating laser. This periodic heat input condition induces fluctuations in both temperature and fluid velocity within the molten pool. A higher oscillation frequency leads to the reduced temperature and fluid velocity. Compared to the circular oscillation mode, the fluid velocity is larger under the linear oscillation mode, primarily due to the larger temperature gradient. However, the surface area of the molten pool is larger under the circular oscillation mode, resulting in the capture of more powder particles. Moreover, the calculated Peclet number and Marangoni number are both larger than unit, indicating that thermal convection is the dominant heat transfer mechanism and Marangoni force is the primary driving force during the DED-LBO process. A good agreement is achieved between the simulated and experimental dimensions of the deposited tracks, with a relative error of <11.2 %. This study could enhance the understanding of thermal-fluid transport behavior of the molten pool during the DED-LBO process and provide insights for optimizing process parameters.
分类号一类
WOS关键词SIMULATION ; EVOLUTION ; ALLOY
资助项目National Key R & D Program of China[2023YFB4603701] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB0910203] ; National Natural Science Foun-dation of China[12472123] ; Research Project of Guangdong Aero-space Research Academy[GARA2022001000]
WOS研究方向Thermodynamics ; Engineering ; Mechanics
语种英语
WOS记录号WOS:001502066600004
资助机构National Key R & D Program of China ; Strategic Priority Research Program of Chinese Academy of Sciences ; National Natural Science Foun-dation of China ; Research Project of Guangdong Aero-space Research Academy
其他责任者何秀丽
源URL[http://dspace.imech.ac.cn/handle/311007/101784]  
专题宽域飞行工程科学与应用中心
作者单位1.Guangdong Aerosp Res Acad, Guangzhou, Peoples R China
2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing, Peoples R China;
3.Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing, Peoples R China;
4.Chinese Acad Sci, Inst Mech, Beijing, Peoples R China;
推荐引用方式
GB/T 7714		 Chen, Bo,Dong BX,Bian YH,et al. Investigation of thermal-fluid dynamics in directed energy deposition of 316 L stainless steel with laser beam oscillation[J]. INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,2025,249:18.
APA Chen, Bo.,董斌鑫.,边艳华.,李少霞.,田崇鑫.,...&虞钢.(2025).Investigation of thermal-fluid dynamics in directed energy deposition of 316 L stainless steel with laser beam oscillation.INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,249,18.
MLA Chen, Bo,et al."Investigation of thermal-fluid dynamics in directed energy deposition of 316 L stainless steel with laser beam oscillation".INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 249(2025):18.

入库方式： OAI收割

来源：力学研究所

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