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Formation Mechanism of Fusion Zone in Growth of Single Crystal Superalloy with Low-Segregated Heterogeneous Seed
Guo Jing1,2; Li Jinguo2; Liu Jide2; Huang Ju2,3; Meng Xiangbin2; Sun Xiaofeng2
Corresponding AuthorLi Jinguo(jgli@imr.ac.cn)
2018-03-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume54Issue:3Pages:419-427
AbstractSeeding 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.
KeywordNi-based single crystal superalloy seed solidification interface fusion zone
Funding OrganizationNational Natural Science Foundation of China
DOI10.11900/0412.1961.2017.00144
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51331005] ; National Natural Science Foundation of China[U1508213]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000427121400008
PublisherSCIENCE PRESS
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/127519
Collection中国科学院金属研究所
Corresponding AuthorLi Jinguo
Affiliation1.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
Recommended Citation
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.
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