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A new model of competitive grain growth dominated by the solute field of the Nickel-based superalloys during directional solidification

文献类型：期刊论文

作者Wang, Haiwei1,2; Zhang, Xiaoli3; Meng, Jie1; Yang, Jinxia1; Yang, Yanhong1; Zhou, Yizhou1; Sun, Xiaofeng1
刊名JOURNAL OF ALLOYS AND COMPOUNDS
出版日期2021-08-25
卷号873页码:13
ISSN号0925-8388
关键词Competitive growth Directional solidification Nickel-based superalloy Solute interaction Sidebranching event
DOI10.1016/j.jallcom.2021.159794
通讯作者Meng, Jie(jmeng@imr.ac.cn) ; Zhou, Yizhou(yzzhou@imr.ac.cn)
英文摘要To 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.
资助项目National 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研究方向Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
语种英语
出版者ELSEVIER SCIENCE SA
WOS记录号WOS:000651254900003
资助机构National Key R&D Program of China ; National Science and Technology Major Project ; National Natural Science Foundation of China
源URL[http://ir.imr.ac.cn/handle/321006/161369]  
专题金属研究所_中国科学院金属研究所
通讯作者Meng, Jie; Zhou, Yizhou
作者单位1.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
推荐引用方式
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.

入库方式： OAI收割

来源：金属研究所

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