IMR OpenIR
DEGENERATION PROCESS AND MECHANISM OF PRIMARY MC CARBIDES IN A CAST Ni-BASED SUPERALLOY
Sun Wen; Qin Xuezhi; Guo Jianting; Lou Langhong; Zhou Lanzhang
Corresponding AuthorQin Xuezhi(xzqin@imr.ac.cn)
2016-04-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume52Issue:4Pages:455-462
AbstractPrimary MC carbide is one of the most important phases in cast Ni-based superalloys. During long-term thermal exposure, the primary MC carbide is not stable and tends to degenerate, exhibiting various degeneration reactions, such as MC+gamma -> M6C+gamma', MC+gamma -> M6C + M23C6+gamma' and MC+gamma -> M6C + M23C6+eta. It is widely known that the degeneration of primary MC carbide has obvious influence on the microstructural evolutions of superalloys, including coarsening of gamma' phase, coarsening of grain boundaries and precipitation of topologically close packed (TCP) phase, and consequently the mechanical properties of alloys. Much research work has focused on the degeneration mechanism of primary MC carbide during long-term thermal exposure, however, it is not very clear so far. In this work, a cast Ni-based superalloy is fabricated and thermally exposed at 850 degrees C for 500 similar to 10000 h in order to study the degeneration mechanism of primary MC carbide. The degeneration of primary MC carbide is observed by OM, SEM and TEM. High-angle annular dark field (HAADF) mode of TEM is used to clearly observe the degeneration of primary MC carbide and the element distribution in the degeneration areas. The results show that the primary MC degeneration is an inter-diffusion process which occurs between the primary carbide and the gamma matrix. During the degeneration, C is released from the primary carbide, Ni, Al and Cr are provided by the gamma matrix, while Ti, W and Mo come from both primary MC and gamma matrix. The precipitation of 77 phase is determined by the atomic fraction of Ti+Nb+Ta+Hf and atomic ratio of (Ti+Nb+Ta+Hf)/Al and its amount is affected by the degeneration degree of primary MC carbide. The higher the degeneration degree, the larger the tendency for the precipitation of the eta phase.
Keywordcast Ni-based superalloy long-term thermal exposure primary MC carbide degeneration mechanism
Funding OrganizationNational Natural Science Foundation of China ; National Energy Administration Program of China
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51001101] ; National Energy Administration Program of China[NY20150102]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000374809600009
PublisherSCIENCE PRESS
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/122053
Collection中国科学院金属研究所
Corresponding AuthorQin Xuezhi
AffiliationChinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Sun Wen,Qin Xuezhi,Guo Jianting,et al. DEGENERATION PROCESS AND MECHANISM OF PRIMARY MC CARBIDES IN A CAST Ni-BASED SUPERALLOY[J]. ACTA METALLURGICA SINICA,2016,52(4):455-462.
APA Sun Wen,Qin Xuezhi,Guo Jianting,Lou Langhong,&Zhou Lanzhang.(2016).DEGENERATION PROCESS AND MECHANISM OF PRIMARY MC CARBIDES IN A CAST Ni-BASED SUPERALLOY.ACTA METALLURGICA SINICA,52(4),455-462.
MLA Sun Wen,et al."DEGENERATION PROCESS AND MECHANISM OF PRIMARY MC CARBIDES IN A CAST Ni-BASED SUPERALLOY".ACTA METALLURGICA SINICA 52.4(2016):455-462.
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
[Sun Wen]'s Articles
[Qin Xuezhi]'s Articles
[Guo Jianting]'s Articles
Baidu academic
Similar articles in Baidu academic
[Sun Wen]'s Articles
[Qin Xuezhi]'s Articles
[Guo Jianting]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Sun Wen]'s Articles
[Qin Xuezhi]'s Articles
[Guo Jianting]'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.