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Macro-micro modeling and simulation for the morphological evolution of the solidification structures in the entire weld
Han, Rihong; Li, Yiyi; Lu, Shanping; Lu, SP (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Peoples R China.
2017-03-01
Source PublicationINTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
ISSN0017-9310
Volume106Pages:1345-1355
AbstractThe heat and mass transfer and the morphological evolution of the various weld solidification structures for the entire weld were simulated through the macro-micro modeling which combined the welding process and the solidification structures in the weld pool. The weld profiles were calculated for different welding conditions, and the effects of the welding parameters on the solidification conditions were analyzed along the trailing pool boundary. The formation mechanism of the axial columnar structure and the equiaxed grains in the weld were studied by the developed model. The results indicate that the temperature gradient G, solidification rate R-w, and the ratio G/R-w, along the trailing pool boundary are related with the location in the weld and the welding parameters. If there does not exist heterogeneous nuclei in the weld pool, the axial columnar structure forms in the central region of the weld at low welding speeds owing to the anisotropic kinetics of the dendritic structure. When the heterogeneous nucleation occurs in the weld pool, the weld structure is directly determined by the competitive growth between the columnar and new nucleated grains. At low welding speeds, the preferential orientations of the survival grains get closer to the welding direction with the decrease of the distance to the weld centerline. With the increase of the welding speed and welding current, more grains form in the weld pool, and the new nucleated grains also become more competitive. The columnar grains from the fusion line are blocked by the equiaxed grains. The continuous equiaxed grain zone forms in the weld, and the columnar to equiaxed transition (CET) occurs. (C) 2016 Elsevier Ltd. All rights reserved.; The heat and mass transfer and the morphological evolution of the various weld solidification structures for the entire weld were simulated through the macro-micro modeling which combined the welding process and the solidification structures in the weld pool. The weld profiles were calculated for different welding conditions, and the effects of the welding parameters on the solidification conditions were analyzed along the trailing pool boundary. The formation mechanism of the axial columnar structure and the equiaxed grains in the weld were studied by the developed model. The results indicate that the temperature gradient G, solidification rate R-w, and the ratio G/R-w, along the trailing pool boundary are related with the location in the weld and the welding parameters. If there does not exist heterogeneous nuclei in the weld pool, the axial columnar structure forms in the central region of the weld at low welding speeds owing to the anisotropic kinetics of the dendritic structure. When the heterogeneous nucleation occurs in the weld pool, the weld structure is directly determined by the competitive growth between the columnar and new nucleated grains. At low welding speeds, the preferential orientations of the survival grains get closer to the welding direction with the decrease of the distance to the weld centerline. With the increase of the welding speed and welding current, more grains form in the weld pool, and the new nucleated grains also become more competitive. The columnar grains from the fusion line are blocked by the equiaxed grains. The continuous equiaxed grain zone forms in the weld, and the columnar to equiaxed transition (CET) occurs. (C) 2016 Elsevier Ltd. All rights reserved.
description.department[han, rihong ; lu, shanping] chinese acad sci, shenyang natl lab mat sci, inst met res, 72 wenhua rd, shenyang 110016, peoples r china ; [li, yiyi ; lu, shanping] chinese acad sci, inst met res, key lab nucl mat & safety assessment, 62 wencui rd, shenyang 110016, peoples r china ; [han, rihong] shijiazhuang tiedao univ, sch mat sci & engn, shijiazhuang 050043, peoples r china
KeywordWeld Pool Solidification Conditions Weld Grain Structure Cellular Automata
Subject AreaThermodynamics ; Engineering, Mechanical ; Mechanics
Funding OrganizationNational Science Foundation of China (NSFC) [51104142]; Shenyang National Laboratory for Materials Science [2015RP25]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/78273
Collection中国科学院金属研究所
Corresponding AuthorLu, SP (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Peoples R China.
Recommended Citation
GB/T 7714
Han, Rihong,Li, Yiyi,Lu, Shanping,et al. Macro-micro modeling and simulation for the morphological evolution of the solidification structures in the entire weld[J]. INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,2017,106:1345-1355.
APA Han, Rihong,Li, Yiyi,Lu, Shanping,&Lu, SP .(2017).Macro-micro modeling and simulation for the morphological evolution of the solidification structures in the entire weld.INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,106,1345-1355.
MLA Han, Rihong,et al."Macro-micro modeling and simulation for the morphological evolution of the solidification structures in the entire weld".INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 106(2017):1345-1355.
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