Effect of Platform Dimension on the Dendrite Growth and Stray Grain Formation in a Ni-Base Single-Crystal Superalloy

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	Effect of Platform Dimension on the Dendrite Growth and Stray Grain Formation in a Ni-Base Single-Crystal Superalloy
	X. B. Meng; J. G. Li; Z. Q. Chen; Y. H. Wang; S. Z. Zhu; X. F. Bai; F. Wang; J. Zhang; T. Jin; X. F. Sun; Z. Q. Hu
	2013
发表期刊	Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science
ISSN	1073-5623
卷号	44A 期号:4 页码:1955-1965
摘要	A model of typical turbine blade shape with different platforms was designed to study the nucleation and growth of stray grains in the platforms by both experimental investigation and a ProCAST simulation based on a cellular automaton finite-element model. The results show that at the withdrawal rate of 5 mm/min, no stray grains nucleate in the small dimensional platform. However, the primary grain grows into the inner and outer sections of this platform in different manners due to different thermal conditions in these sections. Furthermore, with the increase of platform dimension, stray grains with random orientations gradually nucleate in the corners of the platforms. It is found that these stray grains tend to nucleate either in the inner corners or at a faster withdrawal rate, which is associated with the corresponding thermal condition. Based on these results, the rule of the critical platform dimension and withdrawal rate without stray grain formation has been proposed. Besides, the simulation results are in accordance with experimental findings.
部门归属	[meng, x. b. ; li, j. g. ; jin, t. ; sun, x. f. ; hu, z. q.] chinese acad sci, inst met res, shenyang 110016, peoples r china. [chen, z. q. ; wang, y. h. ; zhu, s. z. ; bai, x. f.] aviat ind corp china avic shenyang liming aeroeng, shenyang 110043, peoples r china. [wang, f.] aviat ind corp china avic guiyang liyang aeroengi, guiyang 550002, peoples r china. [zhang, j.] northwestern polytech univ, state key lab solidificat proc, xian 710072, peoples r china. ; meng, xb (reprint author), chinese acad sci, inst met res, shenyang 110016, peoples r china. ; xbmeng@imr.ac.cn
关键词	Low-angle Boundaries Directional Solidification Freckle Formation Spiral Selector Turbine-blades Simulation Castings Prediction Mechanism
URL	查看原文
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/71408
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. B. Meng,J. G. Li,Z. Q. Chen,et al. Effect of Platform Dimension on the Dendrite Growth and Stray Grain Formation in a Ni-Base Single-Crystal Superalloy[J]. Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science,2013,44A(4):1955-1965.
APA	X. B. Meng.,J. G. Li.,Z. Q. Chen.,Y. H. Wang.,S. Z. Zhu.,...&Z. Q. Hu.(2013).Effect of Platform Dimension on the Dendrite Growth and Stray Grain Formation in a Ni-Base Single-Crystal Superalloy.Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science,44A(4),1955-1965.
MLA	X. B. Meng,et al."Effect of Platform Dimension on the Dendrite Growth and Stray Grain Formation in a Ni-Base Single-Crystal Superalloy".Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science 44A.4(2013):1955-1965.