Surface orientation dependent oxidation behavior of aluminized DS CM 247 LC nickel-base superalloy

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	Surface orientation dependent oxidation behavior of aluminized DS CM 247 LC nickel-base superalloy
	F. H. Yuan; Y. S. Yoo; C. Y. Jo; B. G. Choi; Z. Q. Hu
	2004
发表期刊	Surface & Coatings Technology
ISSN	0257-8972
卷号	183 期号:1 页码:106-110
摘要	A study has been carried out into the oxidation behavior of a directionally solidified superalloy. Three types of specimens were cut transversely (T), longitudinally (L) and at 45degrees angle (45degrees) in relation to the solidifying direction of the DS CM 247 LC rods. These specimens were aluminized by the pack cementation method and then were oxidized at 1000 degreesC for 200 h. The coating grows epitaxially on (0 0 1) surfaces of the directionally solidified superalloy. Epitaxy of the coating on the L specimens is also evident. All the coatings on the above specimens consist of a precipitation-rich layer, a precipitation-free layer and an interdiffusion layer. Lamellar alpha-Cr precipitates directly in the substrate underneath the interdiffusion layer during the aluminization process, and in the subsequent interdiffusion process during the oxidation tests. The formation of the theta-Al2O3 leads to a fast oxidation rate for the T, L and 45degrees specimens in the transient stage. The 45degrees specimens oxidized at the fastest rate, while the T specimens gave the smallest weight gain. After 20 h, further weight gains of all these specimens are very small, due to more stable alpha-Al2O3 growth and transformation from theta-Al2O3 to alpha-Al2O3. The slower oxidation rate in the case of the T specimens might be a result of epitaxial growth of theta-Al2O3 on the beta-NiAl coating. (C) 2003 Elsevier B.V. All rights reserved.
部门归属	chinese acad sci, inst met res, state key lab corros & protect, shenyang 110016, peoples r china. korea inst machinery & mat, high temp mat lab, kyungnam 641010, south korea.;yuan, fh (reprint author), chinese acad sci, inst met res, state key lab corros & protect, 72 wenhua rd, shenyang 110016, peoples r china;fhyuan@imr.ac.cn
关键词	Nickel Alloy Pack Diffusion Coating Oxidation Directional Solidification Aluminide Coating Oxidation Anisotropy Crystallographic Relationships Coatings Microstructures Mar-m247 Growth
URL	查看原文
WOS记录号	WOS:000221512200013
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/321006/35695
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	F. H. Yuan,Y. S. Yoo,C. Y. Jo,et al. Surface orientation dependent oxidation behavior of aluminized DS CM 247 LC nickel-base superalloy[J]. Surface & Coatings Technology,2004,183(1):106-110.
APA	F. H. Yuan,Y. S. Yoo,C. Y. Jo,B. G. Choi,&Z. Q. Hu.(2004).Surface orientation dependent oxidation behavior of aluminized DS CM 247 LC nickel-base superalloy.Surface & Coatings Technology,183(1),106-110.
MLA	F. H. Yuan,et al."Surface orientation dependent oxidation behavior of aluminized DS CM 247 LC nickel-base superalloy".Surface & Coatings Technology 183.1(2004):106-110.