| Numerical simulation of thermal behavior and multicomponent mass transfer in direct laser deposition of Co-base alloy on steel |
| Gan ZT; Yu G(虞钢) ; He XL(何秀丽); Li SX(李少霞); Yu, G (reprint author), Chinese Acad Sci, Inst Mech, Key Lab Mech Adv Mfg, Beijing 100190, Peoples R China.
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| 发表期刊 | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
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| 2017
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| 卷号 | 104页码:28-38 |
| ISSN | 0017-9310
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| 摘要 | During direct laser deposition process, rapid melting-solidification and addition of multicomponent powder lead to complex transport phenomena in the melt pool. The thermal behavior and mass transport significantly affect the solidified microstructure and properties of fabricated layer. In this paper, an improved 3D numerical model is proposed to simulate the heat transfer, fluid flow, solidification and multicomponent mass transport in direct laser deposition of Co-base alloy on steel. The solidification characteristics, including temperature gradient (G), solidification growth rate (R) and cooing rate (G x R), can be obtained by transient thermal distribution to predict the morphology and scale of the solidification microstructure. Multicomponent transport equation based on a mixture-averaged approach is combined with other conservation equations. The calculated melt pool geometry and the composition profiles of iron (Fe), carbon (C), cobalt (Co) and chromium (Cr) are compared with the experimental results. The results show that in the initial stage of direct laser deposition, the rapidly mixture of substrate material and added material occur in the melt pool and conduct plays an important role in heat transfer due to the low Peclet number. As the melt pool is developed, the heat and mass transfer in the melt pool are dominated by strong Marangoni convection. An unmixed zone is observed near the bottom of melt pool where the convection is frictionally dissipated due to the presence of solidified dendrites. Since the G/R decreases and G x R increases from the bottom to the top of the solidified track, the morphology of the microstructure changes from planar front to columnar dendrites to equiaxed dendrites and the grain size decreases. (C) 2016 Elsevier Ltd. All rights reserved. |
| 关键词 | Laser Cladding
Thermal Behavior
Solidification
Multicomponent Mass Transfer
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| DOI | 10.1016/j.ijheatmasstransfer.2016.08.049
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| URL | 查看原文
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| 收录类别 | SCI
; EI
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| 语种 | 英语
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| WOS记录号 | WOS:000387627400004
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| 关键词[WOS] | Laser cladding
; Thermal behavior
; Solidification
; Multicomponent mass transfer
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| WOS研究方向 | Thermodynamics
; Engineering
; Mechanics
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| WOS类目 | Thermodynamics
; Engineering, Mechanical
; Mechanics
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| 项目资助者 | National Natural Science Foundation of China [11272316, 11272317, 11502269]
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| 课题组名称 | MAM激光智能制造工艺力学
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| 论文分区 | 一类
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| 力学所作者排名 | 1
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| 引用统计 |
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| 文献类型 | 期刊论文
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| 条目标识符 | http://dspace.imech.ac.cn/handle/311007/59951
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| 专题 | 先进制造工艺力学实验室
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| 通讯作者 | Yu, G (reprint author), Chinese Acad Sci, Inst Mech, Key Lab Mech Adv Mfg, Beijing 100190, Peoples R China. |
推荐引用方式
GB/T 7714 |
Gan ZT,Yu G,He XL,et al. Numerical simulation of thermal behavior and multicomponent mass transfer in direct laser deposition of Co-base alloy on steel[J]. INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,2017,104:28-38.
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| APA |
Gan ZT,虞钢,何秀丽,李少霞,&Yu, G .(2017).Numerical simulation of thermal behavior and multicomponent mass transfer in direct laser deposition of Co-base alloy on steel.INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,104,28-38.
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| MLA |
Gan ZT,et al."Numerical simulation of thermal behavior and multicomponent mass transfer in direct laser deposition of Co-base alloy on steel".INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 104(2017):28-38.
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