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Title:
Numerical simulation of thermal behavior and multicomponent mass transfer in direct laser deposition of Co-base alloy on steel
Author: Gan ZT; Yu G(虞钢); He XL(何秀丽); Li SX(李少霞)
Source: INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Issued Date: 2017
Volume: 104, Pages:28-38
Abstract: 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.
Keyword: Laser cladding ; Thermal behavior ; Solidification ; Multicomponent mass transfer
Language: 英语
Indexed Type: SCI ; EI
Corresponding Author: Yu, G (reprint author), Chinese Acad Sci, Inst Mech, Key Lab Mech Adv Mfg, Beijing 100190, Peoples R China.
Correspondent Email: gyu@imech.ac.cn
DOI: 10.1016/j.ijheatmasstransfer.2016.08.049
Related URLs: 查看原文
DOC Type: 期刊论文
WOS Subject: Thermodynamics ; Engineering, Mechanical ; Mechanics
WOS Subject Extended: Thermodynamics ; Engineering ; Mechanics
WOS Keyword Plus: Laser cladding ; Thermal behavior ; Solidification ; Multicomponent mass transfer
WOS ID: WOS:000387627400004
ISSN: 0017-9310
Funder: National Natural Science Foundation of China [11272316, 11272317, 11502269]
Rank: [Gan, Zhengtao; Yu, Gang; He, Xiuli; Li, Shaoxia] Chinese Acad Sci, Inst Mech, Key Lab Mech Adv Mfg, Beijing 100190, Peoples R China
Department: MAM激光智能制造工艺力学
Classification: 一类
Citation statistics:
Content Type: 期刊论文
URI: http://dspace.imech.ac.cn/handle/311007/59951
Appears in Collections:先进制造工艺力学重点实验室_期刊论文

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Recommended Citation:
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,2017-01-01,104:28-38.
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