Thermal fatigue behavior of cast nickel base superalloy K445

IMR OpenIR

	Thermal fatigue behavior of cast nickel base superalloy K445
	Li Youlin; Yuan Chao; Guo Jianting
通讯作者	Guo Jianting(jtguo@imr.ac.cn)
	2006-10-11
发表期刊	ACTA METALLURGICA SINICA
ISSN	0412-1961
卷号	42 期号:10 页码:1056-1060
摘要	Thermal fatigue (TF) behaviors of cast nickel base superalloy K445 was studied in the temperature ranges of 800, 850 and 900 degrees C to RT, using V-notch plate specimens. Optical microscopy (OM) and scanning electron microscopy (SEM) were used to examine the damage mechanisms of thermal fatigue. Almost all the primary fatigue cracks at elevated temperatures propagate intergranularly and the secondary crack is transgranular. At 800 degrees C cycling, the cracking of MC carbides either at grain boundaries or within the grain interior, as well as decohesion of MC/matrix interface, are the preferential sites of crack propagation. At 900 degrees C cycling, the crack propagation is an oxidation-dominant and carbide-assisted process. Stress assisted grain boundary oxygen (SAGBO) embrittlement is the principle mechanism of the environmental degradation to the tested alloy.
关键词	cast nickel base superalloy thermal fatigue carbide oxidation at high temperature
收录类别	SCI
语种	英语
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000241783700010
出版者	SCIENCE CHINA PRESS
引用统计	被引频次：17[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/321006/86272
专题	中国科学院金属研究所
通讯作者	Guo Jianting
作者单位	Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Li Youlin,Yuan Chao,Guo Jianting. Thermal fatigue behavior of cast nickel base superalloy K445[J]. ACTA METALLURGICA SINICA,2006,42(10):1056-1060.
APA	Li Youlin,Yuan Chao,&Guo Jianting.(2006).Thermal fatigue behavior of cast nickel base superalloy K445.ACTA METALLURGICA SINICA,42(10),1056-1060.
MLA	Li Youlin,et al."Thermal fatigue behavior of cast nickel base superalloy K445".ACTA METALLURGICA SINICA 42.10(2006):1056-1060.