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Title:
Modeling of thermal behavior and mass transport in multi-layer laser additive manufacturing of Ni-based alloy on cast iron
Author: Gan ZT(甘正涛); Liu H(刘浩); Li SX(李少霞); He XL(何秀丽); Yu G(虞钢)
Source: INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Issued Date: 2017-08-01
Volume: 111, Pages:709-722
Abstract: During multi-layer additive manufacturing, multiple thermal cycles and addition of dissimilar-metal powder, even functionally graded materials (FGMs), lead to complicated transport phenomena and solidification behavior in the molten pool, which significantly impact the microstructure evolution and mechanical properties of deposited part. In this study, a predictive three-dimensional numerical model is developed to understand the multi-physical processes such as thermal behavior, Marangoni effect, composition transport, solidification behavior, and dendrite growth in multi-layer additive manufacturing of Ni-based alloy on cast iron. Dimensional analysis is performed to simplify the force balance equation on the liquid-gas interface, which determines the dynamic profile of molten pool. The conservation equations of mass, momentum, enthalpy and concentration are solved in parallel. Transient temperature distribution and thermal cycles at different locations are obtained. The solidification parameters at the liquid-solid interface are evaluated to interpret the solidification microstructure. The distribution of alloy elements and composition profile (Ni and Cr) are also present and compared with the relevant experimental results. The results show that the cooling rate declines progressively as the subsequent layers deposit, which results in the coarser solidified grains in the upper of part. Even though the powder and substrate can be efficiently mixed to be a homogeneous molten pool, a non-uniform concentration distribution is observed at the bottom of the deposited part, which agrees well with the experimental composition profile using Energy Dispersive Spectrometer (EDS). (C) 2017 Elsevier Ltd. All rights reserved.
Keyword: Additive manufacturing ; Thermal behavior ; Mass transfer ; Liquid-gas interface ; Solidification ; Functionally graded materials
Language: 英语
Indexed Type: SCI ; EI
DOI: 10.1016/j.ijheatmasstransfer.2017.04.055
DOC Type: Article
WOS Subject: Thermodynamics ; Engineering, Mechanical ; Mechanics
WOS Subject Extended: Thermodynamics ; Engineering ; Mechanics
WOS Keyword Plus: NUMERICAL-SIMULATION ; STEEL ; SOLIDIFICATION ; DEPOSITION ; EVOLUTION ; PROFILE ; FIELD ; HEAT
WOS ID: WOS:000404092900066
ISSN: 0017-9310
Funder: National Natural Science Foundation of China(11272316||Natural Science Foundation of Jiangsu Province(BK20160258)||11272317||11502269)
Department: MAM激光智能制造工艺力学
First Institution (Yes or Not): true
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Content Type: 期刊论文
URI: http://dspace.imech.ac.cn/handle/311007/60629
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,Liu H,Li SX,et al. Modeling of thermal behavior and mass transport in multi-layer laser additive manufacturing of Ni-based alloy on cast iron[J]. INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,2017-08-01,111:709-722.
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