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

doi:10.1016/j.jallcom.2021.159794

IMR OpenIR

	A new model of competitive grain growth dominated by the solute field of the Nickel-based superalloys during directional solidification
	Wang, Haiwei 1,2; Zhang, Xiaoli 3; Meng, Jie 1; Yang, Jinxia 1; Yang, Yanhong 1; Zhou, Yizhou 1; Sun, Xiaofeng 1
通讯作者	Meng, Jie(jmeng@imr.ac.cn) ; Zhou, Yizhou(yzzhou@imr.ac.cn)
	2021-08-25
发表期刊	JOURNAL OF ALLOYS AND COMPOUNDS
ISSN	0925-8388
卷号	873 页码:13
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.
关键词	Competitive growth Directional solidification Nickel-based superalloy Solute interaction Sidebranching event
资助者	National Key R&D Program of China ; National Science and Technology Major Project ; National Natural Science Foundation of China
DOI	10.1016/j.jallcom.2021.159794
收录类别	SCI
语种	英语
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
WOS类目	Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000651254900003
出版者	ELSEVIER SCIENCE SA
引用统计	被引频次：10[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/161370
专题	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.