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Surface-active element transport and its effect on liquid metal flow in laser-assisted additive manufacturing
Gan ZT(甘正涛); Yu G(虞钢); He XL(何秀丽); Li SX(李少霞); Yu, G; He, XL (reprint author), Chinese Acad Sci, Inst Mech, Key Lab Mech Adv Mfg, Beijing 100049, Peoples R China.
2017-08-01
发表期刊INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
卷号86页码:206-214
ISSN0735-1933
摘要During laser-assisted additive manufacturing, the transport phenomena, solidification behavior, and melt pool geometry are affected by base-metal sulfur content and oxygen present in the atmosphere. The role of these surface-active elements during metal-based additive manufacturing is not well understood. In this study, the mass transport of sulfur and its effect on liquid metal convection (Marangoni flow) are examined by using an improved 3D transient heat transfer and fluid flow numerical model. An improved surface tension model is proposed to take into account the influence of sulfur content and temperature at the surface of melt pool. The sulfur mass transport equation is combined with the other conservation equations. The results show that the sulfur redistribution leads to transitional Marangoni flow. The powder addition into the melt pool results in the dilution of sulfur in the melt pool. Increase in mass flow rate and energy input results in decreased temperature coefficient of surface tension. When temperature coefficient of surface tension changes sign from positive to negative, the flow motion transition from inward flow to outward flow occurs. Two predominant types of flow pattern lead to two types of fusion boundaries of deposited track.
关键词Additive Manufacturing Mass Transfer Surface-active Element Fluid Flow
DOI10.1016/j.icheatmasstransfer.2017.06.007
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收录类别SCI ; EI
语种英语
WOS记录号WOS:000408183800024
关键词[WOS]HEAT-TRANSFER ; FLUID-FLOW ; WELD POOL ; NUMERICAL-SIMULATION ; DEPOSITION ; TEMPERATURE ; OXYGEN ; MODEL ; CONVECTION ; TENSION
WOS研究方向Thermodynamics ; Mechanics
WOS类目Thermodynamics ; Mechanics
项目资助者National Natural Science Foundation of China(11272316 ; 11272317 ; 11502269)
课题组名称MAM激光智能制造工艺力学
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文献类型期刊论文
条目标识符http://dspace.imech.ac.cn/handle/311007/70058
专题先进制造工艺力学重点实验室
通讯作者Yu, G; He, XL (reprint author), Chinese Acad Sci, Inst Mech, Key Lab Mech Adv Mfg, Beijing 100049, Peoples R China.
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GB/T 7714
Gan ZT,Yu G,He XL,et al. Surface-active element transport and its effect on liquid metal flow in laser-assisted additive manufacturing[J]. INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER,2017,86:206-214.
APA 甘正涛,虞钢,何秀丽,李少霞,Yu, G,&He, XL .(2017).Surface-active element transport and its effect on liquid metal flow in laser-assisted additive manufacturing.INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER,86,206-214.
MLA 甘正涛,et al."Surface-active element transport and its effect on liquid metal flow in laser-assisted additive manufacturing".INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER 86(2017):206-214.
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