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COMPETITIVE GROWTH IN BI-CRYSTAL OF Ni-BASED SUPERALLOYS DURING DIRECTIONAL SOLIDIFICATION
Lu Qi; Li Jinguo; Jin Tao; Zhou Yizhou; Sun Xiaofeng; Hu Zhuangqi
Corresponding AuthorLi Jinguo(jgli@imr.ac.cn)
2011-06-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume47Issue:6Pages:641-648
AbstractSingle crystal nickel-based superalloys, which offer improved creep-rupture, fatigue, oxidation and coating properties, have been widely applied in turbine blades and vanes. In general, the single crystal structure is produced through competitive grain growth by directional solidification technology. However, in actual directional solidification process, the orientations of the primary and secondary dendrites are random due to the randomness of the grain nucleation. Therefore, the actual competitive grain growth during directional solidification is a three-dimensional process. However the related literatures are fewer. In the present study, an experimental study had been conducted to investigate the three-dimensional competitive grain growth behavior under different withdrawal velocities by the bi-crystal samples with special orientation relationships. The results showed that the whole sample with bi-crystal microstructure could be obtained when the two seeds were with the same primary dendrites orientation paralleled to the heat flow direction but different orientations of the secondary dendrites. And the withdrawal velocity had little influence on the competitive grain growth in this disposition relationship. However, only the favorably oriented grain could be obtained when the two seeds were with the non-coplanar primary dendrites and a group of secondary dendrites with the same orientation. The favorably oriented grain overgrew the misaligned grain in a heliciform way. And the overgrowth velocity was in direct proportion to the withdrawal velocity.
Keywordsuperalloy directional solidification competitive growth dendrite growth
Funding OrganizationNational Basic Research Program of China ; National Natural Science Foundation of China
DOI10.3724/SP.J.1037.2010.00697
Indexed BySCI
Language英语
Funding ProjectNational Basic Research Program of China[2010CB631206] ; National Natural Science Foundation of China[50931004] ; National Natural Science Foundation of China[U1037601] ; National Natural Science Foundation of China[50971124]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000292787700001
PublisherSCIENCE PRESS
Citation statistics
Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/104902
Collection中国科学院金属研究所
Corresponding AuthorLi Jinguo
AffiliationChinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Lu Qi,Li Jinguo,Jin Tao,et al. COMPETITIVE GROWTH IN BI-CRYSTAL OF Ni-BASED SUPERALLOYS DURING DIRECTIONAL SOLIDIFICATION[J]. ACTA METALLURGICA SINICA,2011,47(6):641-648.
APA Lu Qi,Li Jinguo,Jin Tao,Zhou Yizhou,Sun Xiaofeng,&Hu Zhuangqi.(2011).COMPETITIVE GROWTH IN BI-CRYSTAL OF Ni-BASED SUPERALLOYS DURING DIRECTIONAL SOLIDIFICATION.ACTA METALLURGICA SINICA,47(6),641-648.
MLA Lu Qi,et al."COMPETITIVE GROWTH IN BI-CRYSTAL OF Ni-BASED SUPERALLOYS DURING DIRECTIONAL SOLIDIFICATION".ACTA METALLURGICA SINICA 47.6(2011):641-648.
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