Surface Tension-Driven Flow and Its Correlation with Mass Transfer during L-DED of Co-Based Powders

doi:10.3390/met12050842

CORC > 力学研究所 > 中国科学院力学研究所 > 宽域飞行工程科学与应用中心

	Surface Tension-Driven Flow and Its Correlation with Mass Transfer during L-DED of Co-Based Powders
	Li, Zhiyong 2,3; Yu, Gang 1,2,3; He, Xiuli 2,3; Li, Shaoxia 2,3; Shu, Zhuang 2,3
刊名	METALS
	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.
资助项目	Beijing Municipal Commission of Science and Technology[Z181100003818015] ; National Natural Science Foundation of China[11672304]
WOS关键词	THERMAL-BEHAVIOR ; PHASE-CHANGE ; LASER ; DEPOSITION ; CONVECTION ; TRANSPORT ; MICROSTRUCTURE
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
内容类型	期刊论文
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.(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.