Surface Tension-Driven Flow and Its Correlation with Mass Transfer during L-DED of Co-Based Powders
文献类型：期刊论文
| 作者 | Li, Zhiyong2,3 ; Yu, Gang1,2,3; He, Xiuli2,3; Li, Shaoxia2,3; Shu, Zhuang2,3; He XL(何秀丽); Yu G(虞钢); Li SX(李少霞); He XL(何秀丽); Yu G(虞钢)
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| 刊名 | METALS
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| 出版日期 | 2022-05-01 |
| 卷号 | 12期号:5页码:18 |
| 关键词 | thermal behavior driving force fluid flow mass transfer additive manufacturing |
| DOI | 10.3390/met12050842 |
| 通讯作者 | He, Xiuli(xthe@imech.ac.cn) ; Li, Shaoxia(lisx@imech.ac.cn) |
| 英文摘要 | Laser direct energy deposition (L-DED) is one of the most promising additive manufacturing methods, which has been paid more and more attention in recent years. An improved heat and mass transfer model was developed here to analyze thermal behavior, driving force, surface tension-driven flow and its correlation with dilution during L-DED of Co-based powders to a 38MnVS substrate. Thermal behavior was firstly studied for its fundamental influence on fluid flow and mass transfer. Next, the roles of capillary force and thermal capillary force were characterized using both the dimensional analysis and simulation methods, and the mechanism of surface tension-driven flow was also qualitatively investigated. Finally, flow characteristics inside the melt pool were studied in detail and their correlation with the dilution phenomenon was analyzed based on the multi-component mass transfer model. The temperature gradient was found to be much larger at the front of the melt pool, and it took about 200 ms for the melt pool to reach a quasi-steady condition. Moreover, sharp changes in the curvature of the solid/liquid boundary were observed. Surface tension was demonstrated as the main driver for fluid flow and resulted in centrally outward Marangoni flow. Capillary force contributes to the reduction of the curvature of the free surface, and thermal capillary force (Marangoni force) dominated the Marangoni convection. Alloy elements from the powders, such as Co and Ni, were added to the front part of the melt pool and mainly diluted at the upper side of the rear region near the symmetric plane of the melt pool. Fundamental results in this work provide a valuable understanding of the surface tension-driven flow and its correlation with concentration dilution during the additive manufacturing process. |
| WOS关键词 | THERMAL-BEHAVIOR ; PHASE-CHANGE ; LASER ; DEPOSITION ; CONVECTION ; TRANSPORT ; MICROSTRUCTURE |
| 资助项目 | Beijing Municipal Commission of Science and Technology[Z181100003818015] ; National Natural Science Foundation of China[11672304] |
| WOS研究方向 | Materials Science ; Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:000803465200001 |
| 资助机构 | Beijing Municipal Commission of Science and Technology ; National Natural Science Foundation of China |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/89504]  |
| 专题 | 宽域飞行工程科学与应用中心 |
| 通讯作者 | He, Xiuli; Li, Shaoxia |
| 作者单位 | 1.Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Wide Range Flight Engn Sci & Applicat Ctr, Inst Mech, Beijing 100190, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Zhiyong,Yu, Gang,He, Xiuli,et al. Surface Tension-Driven Flow and Its Correlation with Mass Transfer during L-DED of Co-Based Powders[J]. METALS,2022,12(5):18. |
| APA | Li, Zhiyong.,Yu, Gang.,He, Xiuli.,Li, Shaoxia.,Shu, Zhuang.,...&Li SX.(2022).Surface Tension-Driven Flow and Its Correlation with Mass Transfer during L-DED of Co-Based Powders.METALS,12(5),18. |
| MLA | Li, Zhiyong,et al."Surface Tension-Driven Flow and Its Correlation with Mass Transfer during L-DED of Co-Based Powders".METALS 12.5(2022):18. |
入库方式： OAI收割
来源：力学研究所
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