Formation Mechanism of Fusion Zone in Growth of Single Crystal Superalloy with Low-Segregated Heterogeneous Seed

doi:10.11900/0412.1961.2017.00144

IMR OpenIR

	Formation Mechanism of Fusion Zone in Growth of Single Crystal Superalloy with Low-Segregated Heterogeneous Seed
	Guo Jing 1,2; Li Jinguo 2; Liu Jide 2; Huang Ju 2,3; Meng Xiangbin 2; Sun Xiaofeng 2
通讯作者	Li Jinguo(jgli@imr.ac.cn)
	2018-03-11
发表期刊	ACTA METALLURGICA SINICA
ISSN	0412-1961
卷号	54 期号:3 页码:419-427
摘要	Seeding technique is a promising method for growing single crystal superalloy blade. However, sometimes stray grains nucleate in the transformation process of single crystal structure from a seed, which always cause failure of single crystal growth. In order to obtain single crystal with high perfection structure, Ni-based single crystal superalloy was prepared with low-segregated seeds by high rate solidification (HRS) method in the dual heating zone furnace. The melt-back zones of seeds were investigated systematically, and the results showed that a fusion zone without microsegregation exists in front of the melt-back equilibrium interface of seeds, in which solidification interface transited from planar to cellular. Further experiments showed that increasing the W content of seeds or the solidification rate can both accelerate the whole non-steady transition process and make fusion zone shrink. Compared with the traditional seeding method, the low segregated heterogeneous seeding technique can increase the casting yield by avoiding the nucleation of stray grains in the fusion zone, which caused by the pinched-off secondary dendrites and constitutional undercooling.
关键词	Ni-based single crystal superalloy seed solidification interface fusion zone
资助者	National Natural Science Foundation of China
DOI	10.11900/0412.1961.2017.00144
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[51331005] ; National Natural Science Foundation of China[U1508213]
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000427121400008
出版者	SCIENCE PRESS
引用统计	被引频次：3[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/321006/127519
专题	中国科学院金属研究所
通讯作者	Li Jinguo
作者单位	1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China 3.Northeastern Univ, Sch Mat Sci & Engn, Shenyang 110819, Liaoning, Peoples R China
推荐引用方式 GB/T 7714	Guo Jing,Li Jinguo,Liu Jide,et al. Formation Mechanism of Fusion Zone in Growth of Single Crystal Superalloy with Low-Segregated Heterogeneous Seed[J]. ACTA METALLURGICA SINICA,2018,54(3):419-427.
APA	Guo Jing,Li Jinguo,Liu Jide,Huang Ju,Meng Xiangbin,&Sun Xiaofeng.(2018).Formation Mechanism of Fusion Zone in Growth of Single Crystal Superalloy with Low-Segregated Heterogeneous Seed.ACTA METALLURGICA SINICA,54(3),419-427.
MLA	Guo Jing,et al."Formation Mechanism of Fusion Zone in Growth of Single Crystal Superalloy with Low-Segregated Heterogeneous Seed".ACTA METALLURGICA SINICA 54.3(2018):419-427.