COMPETITIVE GROWTH IN BI-CRYSTAL OF Ni-BASED SUPERALLOYS DURING DIRECTIONAL SOLIDIFICATION

doi:10.3724/SP.J.1037.2010.00697

IMR OpenIR

	COMPETITIVE GROWTH IN BI-CRYSTAL OF Ni-BASED SUPERALLOYS DURING DIRECTIONAL SOLIDIFICATION
	Lu Qi; Li Jinguo; Jin Tao; Zhou Yizhou; Sun Xiaofeng; Hu Zhuangqi
通讯作者	Li Jinguo(jgli@imr.ac.cn)
	2011-06-11
发表期刊	ACTA METALLURGICA SINICA
ISSN	0412-1961
卷号	47 期号:6 页码:641-648
摘要	Single 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.
关键词	superalloy directional solidification competitive growth dendrite growth
资助者	National Basic Research Program of China ; National Natural Science Foundation of China
DOI	10.3724/SP.J.1037.2010.00697
收录类别	SCI
语种	英语
资助项目	National 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研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000292787700001
出版者	SCIENCE PRESS
引用统计	被引频次：12[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/321006/104902
专题	中国科学院金属研究所
通讯作者	Li Jinguo
作者单位	Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 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.