Carbide behaviour during high temperature low cycle fatigue in a cobalt-base superalloy

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	Carbide behaviour during high temperature low cycle fatigue in a cobalt-base superalloy
	Jiang, WH ; Yao, XD ; Guan, HR ; Hu, ZQ
刊名	JOURNAL OF MATERIALS SCIENCE
	1999-06-15
卷号	34 期号:12 页码:2859-2864
ISSN号	0022-2461
通讯作者	Jiang, WH()
英文摘要	The carbide behaviour of a directionally solidified cobalt-base superalloy has been investigated after low cycle fatigue at 900 degrees C. During fatigue, primary carbides, M7C3 and MC, decomposed sluggishly and a great amount of secondary carbide, chromium-rich M23C6 precipitated. The inhomogeneous distribution of M23C6 brought about a different dislocation substructure. In the vicinity of the primary carbides, densely-distributed fine M23C6 pinned up dislocations effectively, resulting in a uniform distribution of dislocations, while in the interior of grains, since precipitates were coarse and scarce, dislocations were arranged in a planar array and piled up in the front of the precipitates. M23C6 also acted as an obstacle deflecting fatigue crack. Primary carbides on the surface of specimens were oxidizied preferentially, causing a precipitate depletion around them. The oxidized primary carbides were crack initiation sites. The primary carbides hindered fatigue crack propagation, causing the formation of shear steps. (C) 1999 Kluwer Academic Publishers.
WOS研究方向	Materials Science
语种	英语
出版者	KLUWER ACADEMIC PUBL
WOS记录号	WOS:000081134400015
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/109091]
专题	金属研究所_中国科学院金属研究所
通讯作者	Jiang, WH
作者单位	1.Chinese Acad Sci, Dept 6, Met Res Inst, Shenyang 110015, Peoples R China 2.Shenyang Polytech Univ, Dept Met Mat Engn, Shenyang 110023, Peoples R China
推荐引用方式 GB/T 7714	Jiang, WH,Yao, XD,Guan, HR,et al. Carbide behaviour during high temperature low cycle fatigue in a cobalt-base superalloy[J]. JOURNAL OF MATERIALS SCIENCE,1999,34(12):2859-2864.
APA	Jiang, WH,Yao, XD,Guan, HR,&Hu, ZQ.(1999).Carbide behaviour during high temperature low cycle fatigue in a cobalt-base superalloy.JOURNAL OF MATERIALS SCIENCE,34(12),2859-2864.
MLA	Jiang, WH,et al."Carbide behaviour during high temperature low cycle fatigue in a cobalt-base superalloy".JOURNAL OF MATERIALS SCIENCE 34.12(1999):2859-2864.