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

doi:10.1016/j.mtcomm.2021.102350

CORC > 金属研究所 > 中国科学院金属研究所

	Investigating the evolution of freckles into sliver defects in Ni-based single-crystal superalloy castings
	Han, Dongyu 2,3; Jiang, Weiguo 4; Xiao, Jiuhan 2,3; Li, Kaiwen 1,2; Lu, Yuzhang 2; Lou, Langhong 2
刊名	MATERIALS TODAY COMMUNICATIONS
	2021-06-01
卷号	27 页码:14
关键词	Ni-based superalloys Directional solidification Freckle evolution Slivers
DOI	10.1016/j.mtcomm.2021.102350
通讯作者	Jiang, Weiguo(jwg@wfust.edu.cn)
英文摘要	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.
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
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000683031100001
资助机构	National Natural Science Foundation of China ; National Science and Technology Major Project of China ; National Key Research and Development Program of China
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/159509]
专题	金属研究所_中国科学院金属研究所
通讯作者	Jiang, Weiguo
作者单位	1.Shenyang Univ Technol, Sch Mat Sci & Engn, Shenyang 110870, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shichangxu Innovat Ctr Adv Mat, Shenyang 110016, Peoples R China 3.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 4.Weifang Univ Sci & Technol, Shouguang 262700, Shandong, 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.