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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
Corresponding AuthorJiang, WH()
1999-06-15
Source PublicationJOURNAL OF MATERIALS SCIENCE
ISSN0022-2461
Volume34Issue:12Pages:2859-2864
AbstractThe 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.
Indexed BySCI
Language英语
WOS Research AreaMaterials Science
WOS SubjectMaterials Science, Multidisciplinary
WOS IDWOS:000081134400015
PublisherKLUWER ACADEMIC PUBL
Citation statistics
Cited Times:27[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/109094
Collection中国科学院金属研究所
Corresponding AuthorJiang, WH
Affiliation1.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
Recommended Citation
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.
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