IMR OpenIR
Effect of long-term aging on the microstructure, stress rupture properties and deformation mechanisms of a new cast nickel base superalloy
Ou, Meiqiong1; Ma, Yingche1; Ge, Hualong2,3; Chen, Bo1; Zheng, Shijian2; Liu, Kui1
Corresponding AuthorMa, Yingche(ycma@imr.ac.cn) ; Liu, Kui(kliu@imr.ac.cn)
2018-10-24
Source PublicationMATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN0921-5093
Volume736Pages:76-86
AbstractThe microstructure, stress rupture properties and deformation mechanisms of a new alloy during long-term aging were investigated. The microstructure evolution mainly included the coarsening of gamma' phase and the precipitation of eta phase. During aging at 700 degrees C, 750 degrees C and 800 degrees C, the coarsening rate k of gamma' phase was about 7.818 nm(3)/h, 42.927 nm(3)/h and 178.226 nm(3)/h, respectively. The activation energy Q for gamma' coarsening was about 279.98 kJ/mol, which meant that element diffusion controlled the coarsening of gamma' phase. After aging at 750 degrees C for 3000 h and 800 degrees C for 2000 h, a new needle-like eta phase was precipitated near GBs and around MC carbides, then grew into the grain interiors. The quantity of eta phase increased with the increase of aging time. With the growth of eta phase, gamma' depleted zones were found around eta phase. This was principally because both gamma' phase and eta phase were enriched in Ni and Ti, and the growing up of I phase absorbed gamma' phase. After aging at 700 degrees C for 300-3000 h and 750 degrees C for 300-2000 h, the stress rupture life at 750 degrees C/430 MPa remained at a high level and most of them were higher than 100 h. That was because the slightly grown-up gamma' phase acted as strong obstacles to the dislocation motion, Orowan bypassing combing stacking fault shearing acted as the dominant mechanism during stress rupture deformation. After aging at 750 degrees C and 800 degrees C for 3000 h, the stress rupture life decreased to 45.7 h and 7.68 h, respectively. One reason was that the seriously grown-up gamma' phase was very hard to impede the dislocation motion, almost all gamma' phases were cut by dislocations with leaving stacking faults inside them during stress rupture deformation. The other reason was that needle-like eta phase promoted dislocation pile-up and contributed to the nucleation of micro-cracks, meanwhile the gamma' depleted zones could be conductive to the propagation of micro-cracks.
KeywordNickel based superalloy Long-term aging gamma ' phase eta phase Dislocation Stress rupture properties
DOI10.1016/j.msea.2018.08.096
Indexed BySCI
Language英语
WOS Research AreaScience & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectNanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000447573400008
PublisherELSEVIER SCIENCE SA
Citation statistics
Cited Times:12[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/129844
Collection中国科学院金属研究所
Corresponding AuthorMa, Yingche; Liu, Kui
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
2.Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
3.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Anhui, Peoples R China
Recommended Citation
GB/T 7714
Ou, Meiqiong,Ma, Yingche,Ge, Hualong,et al. Effect of long-term aging on the microstructure, stress rupture properties and deformation mechanisms of a new cast nickel base superalloy[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2018,736:76-86.
APA Ou, Meiqiong,Ma, Yingche,Ge, Hualong,Chen, Bo,Zheng, Shijian,&Liu, Kui.(2018).Effect of long-term aging on the microstructure, stress rupture properties and deformation mechanisms of a new cast nickel base superalloy.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,736,76-86.
MLA Ou, Meiqiong,et al."Effect of long-term aging on the microstructure, stress rupture properties and deformation mechanisms of a new cast nickel base superalloy".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 736(2018):76-86.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Ou, Meiqiong]'s Articles
[Ma, Yingche]'s Articles
[Ge, Hualong]'s Articles
Baidu academic
Similar articles in Baidu academic
[Ou, Meiqiong]'s Articles
[Ma, Yingche]'s Articles
[Ge, Hualong]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Ou, Meiqiong]'s Articles
[Ma, Yingche]'s Articles
[Ge, Hualong]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.