Investigating the evolution of freckles into sliver defects in Ni-based single-crystal superalloy castings

doi:10.1016/j.mtcomm.2021.102350

IMR OpenIR

	Investigating the evolution of freckles into sliver defects in Ni-based single-crystal superalloy castings
	Han, Dongyu 1,2; Jiang, Weiguo 3; Xiao, Jiuhan 1,2; Li, Kaiwen 1,4; Lu, Yuzhang 1; Lou, Langhong 1
通讯作者	Jiang, Weiguo(jwg@wfust.edu.cn)
	2021-06-01
发表期刊	MATERIALS TODAY COMMUNICATIONS
卷号	27 页码:14
摘要	Freckles are detrimental solidification defects in Ni-based single-crystal superalloy castings that are formed during directional solidification. However, the evolution of freckles into sliver defects has rarely been reported, and the mechanism of this evolution is unclear. In this study, the evolution of freckles into slivers in the extended zone of casting was established to be the deformation of dendrites induced by the thermal contraction stress in the freckle channel. The morphology of the mushy zone was simulated using ProCAST, which indicated that freckles were formed at the highest position of the mushy zone. During the initiation of the slivers, deformation occurred at the freckle channel, indicating that the thermal contraction stress was a result of the solidification shrinkage of solute-rich liquid. The misorientation from the initial freckle grains to the slivers ranged from 15 degrees to 57 degrees. In addition, the orientation and ability of dendrite branching are crucial for the extension of the sliver dendrites.
关键词	Ni-based superalloys Directional solidification Freckle evolution Slivers
资助者	National Natural Science Foundation of China ; National Science and Technology Major Project of China ; National Key Research and Development Program of China
DOI	10.1016/j.mtcomm.2021.102350
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[51674235] ; National Science and Technology Major Project of China[2017VI-0001-0070] ; National Key Research and Development Program of China[2017YFB0702904]
WOS研究方向	Materials Science
WOS类目	Materials Science, Multidisciplinary
WOS记录号	WOS:000683031100001
出版者	ELSEVIER
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/321006/159510
专题	中国科学院金属研究所
通讯作者	Jiang, Weiguo
作者单位	1.Chinese Acad Sci, Inst Met Res, Shichangxu Innovat Ctr Adv Mat, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 3.Weifang Univ Sci & Technol, Shouguang 262700, Shandong, Peoples R China 4.Shenyang Univ Technol, Sch Mat Sci & Engn, Shenyang 110870, Peoples R China
推荐引用方式 GB/T 7714	Han, Dongyu,Jiang, Weiguo,Xiao, Jiuhan,et al. Investigating the evolution of freckles into sliver defects in Ni-based single-crystal superalloy castings[J]. MATERIALS TODAY COMMUNICATIONS,2021,27:14.
APA	Han, Dongyu,Jiang, Weiguo,Xiao, Jiuhan,Li, Kaiwen,Lu, Yuzhang,&Lou, Langhong.(2021).Investigating the evolution of freckles into sliver defects in Ni-based single-crystal superalloy castings.MATERIALS TODAY COMMUNICATIONS,27,14.
MLA	Han, Dongyu,et al."Investigating the evolution of freckles into sliver defects in Ni-based single-crystal superalloy castings".MATERIALS TODAY COMMUNICATIONS 27(2021):14.