SIMULATION AND EXPERIMENTAL STUDIES ON GRAIN SELECTION BEHAVIOR OF SINGLE CRYSTAL SUPERALLOY II. Spiral Part

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	SIMULATION AND EXPERIMENTAL STUDIES ON GRAIN SELECTION BEHAVIOR OF SINGLE CRYSTAL SUPERALLOY II. Spiral Part
其他题名	SIMULATION AND EXPERIMENTAL STUDIES ON GRAIN SELECTION BEHAVIOR OF SINGLE CRYSTAL SUPERALLOY II. Spiral Part
	Zhang Hang 1; Xu Qingyan 1; Sun Changbo 2; Qi Xiang 1; Tang Ning 1; Liu Baicheng 1
	2013
发表期刊	ACTA METALLURGICA SINICA
ISSN	0412-1961
卷号	49 期号:12 页码:1521-1531
摘要	The spiral selector is the key part for producing single crystal (SX) blades and ensures the integrity of crystal, which mainly includes starter block and spiral part. In this work, the influence of spiral part on the grain selection process was studied. Both of the metallography results and EBSD results proved that the prior location and the special orientation of the second dendrite arms were important for the grains competitive growth during the directional solidification process. Based on the experimental results, two geometrical restrict mechanisms of grain selection were proposed. They were the competitive stimulating effect on the second dendrite arms in horizontal direction, which was resulted from the spiral arc shape, and the growing blocking effect on the primary dendrites in vertical direction, which was resulted from the take-off angle of the spiral part. These models could successfully explain the grain selecting effects of the spiral part. The modified cellular automaton (MCA) technology was used to simulate the grains' competitive growth in spiral part. The changes of grains structure and orientation as the grain growing on were studied. The simulated and experimental results were compared and agreed well. Based on the simulated and experimental results, Influences of structural parameters on the grain selection behavior were proposed. The criteria for designing spiral part were also presented.
关键词	DIRECTIONAL SOLIDIFICATION MICROSTRUCTURE EVOLUTION NUMERICAL-SIMULATION PREDICTION MODEL GROWTH numerical simulation grain selection behavior grain orientation EBSD
收录类别	CSCD
语种	英语
资助项目	[National Basic Research Program of China] ; [National Natural Science Foundation of China] ; [National Science and Technology Major Project]
CSCD记录号	CSCD:5025723
引用统计	被引频次：5[CSCD] [CSCD记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/149207
专题	中国科学院金属研究所
作者单位	1.清华大学 2.中国科学院金属研究所
推荐引用方式 GB/T 7714	Zhang Hang,Xu Qingyan,Sun Changbo,et al. SIMULATION AND EXPERIMENTAL STUDIES ON GRAIN SELECTION BEHAVIOR OF SINGLE CRYSTAL SUPERALLOY II. Spiral Part[J]. ACTA METALLURGICA SINICA,2013,49(12):1521-1531.
APA	Zhang Hang,Xu Qingyan,Sun Changbo,Qi Xiang,Tang Ning,&Liu Baicheng.(2013).SIMULATION AND EXPERIMENTAL STUDIES ON GRAIN SELECTION BEHAVIOR OF SINGLE CRYSTAL SUPERALLOY II. Spiral Part.ACTA METALLURGICA SINICA,49(12),1521-1531.
MLA	Zhang Hang,et al."SIMULATION AND EXPERIMENTAL STUDIES ON GRAIN SELECTION BEHAVIOR OF SINGLE CRYSTAL SUPERALLOY II. Spiral Part".ACTA METALLURGICA SINICA 49.12(2013):1521-1531.