THERMO-MECHANICAL FATIGUE BEHAVIOR OF Ni-BASED SUPERALLOY COATED WITH Ni-Cr-Al-Y

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	THERMO-MECHANICAL FATIGUE BEHAVIOR OF Ni-BASED SUPERALLOY COATED WITH Ni-Cr-Al-Y
	Chen Zhubing 2; Huang Zhiwei 2; Wang Zhongguang 2; Zhu Shijie 1
刊名	ACTA METALLURGICA SINICA
	2009-07-01
卷号	45 期号:7 页码:820-825
关键词	Ni-based superalloy Ni-Cr-Al-Y coating thermo-mechanical fatigue crack initiation and propagation
ISSN号	0412-1961
通讯作者	Wang Zhongguang(zhawang@imr.ac.cn)
英文摘要	Gas turbine engine is widely used in industry, marine and aerospace. Its efficiency can be enhanced by increasing inlet gas temperature and reducing heat transfer. To achieve this goal it is important to develop materials with higher melting points. Ni-based superalloy is suitable for vane and blade materials. The properties of superalloy have been improved by directionally solidified and single crystal in last 50 years. But it is limited to develop superalloy with much higher temperature, because the operating temperature approaches the melting point of superalloy. In this rigorous environment, high temperature oxidation and hot corrosion impair the alloy property. MCrAlY coating is commonly used as oxidation- and corrosion-resistant material. Hitherto., it is clearly validated that the oxidation- and corrosion-resistance of hot parts at high temperature can be greatly improved by MCrAlY coating. The difference of materials properties between MCrAlY coating and superalloy may cause interactions which influence the mechanical properties and life of MCrAlY-coated component. A few of studies have conducted on mechanical properties of MCrAlY-coated superalloy. The results revealed that the present of coating affected the performance of superalloy. In service, thermo-mechanical fatigue provides a closer simulation of the actual strain-temperature in an engine environment. Only a few studies were published though their results were not consistency; because the experiment is hard to perform and many factors influence the experiment results such as temperature-strain cycle shape, strain range magnitude, the ductility and the strength of the bond between the coating and the substrate. In this paper, thermo-mechanical fatigue (TMF) behaviors of a Ni-based superalloy M963 coated with Ni-Cr-Al-Y have been investigated at 450-900 degrees C in air under mechanical strain control with a strain ratio of -1 and a period of 200 s. The coating was produced either by air plasma spraying (APS) or by high velocity oxyfuel fuel (HVOF). It was shown that under the same mechanical strain, the out of phase (OP) TMF life is shorter than the in phase (IP) TMF one in both APS and HVOF coated specimens. The TMF life depends on the coating spraying technology under the same testing conditions. Observations of fracture surfaces and longitudinal sections revealed that crack initiation has great impact on the TMF life.
WOS研究方向	Metallurgy & Metallurgical Engineering
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000269377300007
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/98591]
专题	金属研究所_中国科学院金属研究所
通讯作者	Wang Zhongguang
作者单位	1.Fukuoka Inst Technol, Dept Intelligent Mech Engn, Fukuoka, Japan 2.Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Chen Zhubing,Huang Zhiwei,Wang Zhongguang,et al. THERMO-MECHANICAL FATIGUE BEHAVIOR OF Ni-BASED SUPERALLOY COATED WITH Ni-Cr-Al-Y[J]. ACTA METALLURGICA SINICA,2009,45(7):820-825.
APA	Chen Zhubing,Huang Zhiwei,Wang Zhongguang,&Zhu Shijie.(2009).THERMO-MECHANICAL FATIGUE BEHAVIOR OF Ni-BASED SUPERALLOY COATED WITH Ni-Cr-Al-Y.ACTA METALLURGICA SINICA,45(7),820-825.
MLA	Chen Zhubing,et al."THERMO-MECHANICAL FATIGUE BEHAVIOR OF Ni-BASED SUPERALLOY COATED WITH Ni-Cr-Al-Y".ACTA METALLURGICA SINICA 45.7(2009):820-825.