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A new model of competitive grain growth dominated by the solute field of the Nickel-based superalloys during directional solidification
Wang, Haiwei1,2; Zhang, Xiaoli3; Meng, Jie1; Yang, Jinxia1; Yang, Yanhong1; Zhou, Yizhou1; Sun, Xiaofeng1
Corresponding AuthorMeng, Jie(jmeng@imr.ac.cn) ; Zhou, Yizhou(yzzhou@imr.ac.cn)
2021-08-25
Source PublicationJOURNAL OF ALLOYS AND COMPOUNDS
ISSN0925-8388
Volume873Pages:13
AbstractTo accurately predict the microstructure evolution of competitive columnar grain growth, the influence of the potential dominant factors of competition growth such as thermal field, solute field and flow field on the overgrowth behavior of trinary-crystal samples during directional solidification was systematically investigated, with the preferred orientation of the experimental grains orienting parallel and at a limited misorientation angle with respect to the temperature gradient direction. It was found that the grain overgrowth rate was weakly dependent on the temperature gradient, which was inconsistent with the classical theoretical assumption that the grain overgrowth rate was determined by the difference of the tip undercooling between the competing grains. In contrast, the grain overgrowth rate was sensitive to the solute field around the dendrite tips. Additionally, with increasing the natural convection, the grain over-growth rate tended to be promoted at low withdraw speed. These phenomena were attributed to the mechanisms of solute interaction in the converging case and sidebranching events in the diverging case, while the solute field was the dominant factor to govern the overgrowth behavior of the competing grains. Moreover, a new model of competitive grain growth based on the solute field was proposed to predict the microstructure evolution of the Nickel-based superalloys during the directional solidification process. In this new model, the primary spacing of the well-oriented grain in the converging case was smaller than that in the diverging case due to the sidebranching events and dendrite lateral motion, which highlighted a new mechanism of primary spacing evolution in the directional columnar solidification structure. (c) 2021 Elsevier B.V. All rights reserved.
KeywordCompetitive growth Directional solidification Nickel-based superalloy Solute interaction Sidebranching event
Funding OrganizationNational Key R&D Program of China ; National Science and Technology Major Project ; National Natural Science Foundation of China
DOI10.1016/j.jallcom.2021.159794
Indexed BySCI
Language英语
Funding ProjectNational Key R&D Program of China[2019YFA0705300] ; National Science and Technology Major Project[2017-VI-0003-0073] ; National Natural Science Foundation of China[51701210]
WOS Research AreaChemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectChemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000651254900003
PublisherELSEVIER SCIENCE SA
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/161370
Collection中国科学院金属研究所
Corresponding AuthorMeng, Jie; Zhou, Yizhou
Affiliation1.Chinese Acad Sci, Inst Met Res, Shi Changxu Innovat Ctr Adv Mat, Shenyang 110016, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
3.North Minzu Univ, Sch Mat Sci & Engn, Yinchuan 750021, Ningxia, Peoples R China
Recommended Citation
GB/T 7714
Wang, Haiwei,Zhang, Xiaoli,Meng, Jie,et al. A new model of competitive grain growth dominated by the solute field of the Nickel-based superalloys during directional solidification[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2021,873:13.
APA Wang, Haiwei.,Zhang, Xiaoli.,Meng, Jie.,Yang, Jinxia.,Yang, Yanhong.,...&Sun, Xiaofeng.(2021).A new model of competitive grain growth dominated by the solute field of the Nickel-based superalloys during directional solidification.JOURNAL OF ALLOYS AND COMPOUNDS,873,13.
MLA Wang, Haiwei,et al."A new model of competitive grain growth dominated by the solute field of the Nickel-based superalloys during directional solidification".JOURNAL OF ALLOYS AND COMPOUNDS 873(2021):13.
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