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Effects of Rhenium and Tantalum on Microstructural Stability of Hot-Corrosion Resistant Single Crystal Superalloys Aged at 900 degrees C
Huang Taiwen1; Lu Jing1; Xu Yao1; Wang Dong2; Zhang Jian2; Zhang Jiachen1; Zhang Jun1; Liu Lin1
Corresponding AuthorLiu Lin(linliu@nwpu.edu.cn)
2019-11-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume55Issue:11Pages:1427-1436
AbstractThe development of gas turbines urgently requires the development of new single crystal superalloys with capacity to service for long time at higher temperature and under hot corrosion environment. In order to take into account both the strength and structural stability of the alloy, it is an effective way to increase the content of key strengthening elements Re and Ta reasonably, and control the mismatch of gamma/gamma' to delay the growth kinetics of gamma'. In this work, the long-term thermal exposure (LTTE) experiments of single crystal superalloys with different Re and Ta contents at 900 degrees C were carried out. The evolution of morphology and size of gamma', and the precipitation of topological close-packed (TCP) phase during 0 similar to 7500 h ageing process were quantitatively analyzed. The results show that the size and the coarsening rate of gamma' phase decreases with the increase of Ta and Re content in 2Ta2Re, 5Ta0Re, 5Ta2Re, 8Ta0Re and 8Ta2Re alloys. The coarsening rates are 1.445 x 10(-5), 1.569x 10(-5), 1.390x10(-5), 1.465x10(-5) and 1.384x 10(-5) mu m(3)/h respectively. With the increase of Ta and Re content, the effective diffusion coefficient decreases and the diffusion activation energy increases, thus of the coarsening rate of precipitated phase decreases. After ageing for 2000 h, TCP phase was precipitated in turn in alloys containing Re, and the precipitation of TCP phase was more serious in alloys containing higher content of Ta. The interaction between Ta and Re affects the atomic distribution behavior of elements in gamma and gamma', in which 8Ta2Re alloy Ta enters the gamma' phase to increase its lattice constant, and at the same time promotes the distribution of elements such as Re, W and Cr in the gamma matrix, which results in more negative gamma/gamma' mismatch and promotes the precipitation of TCP phase.
Keywordhot-corrosion resistant single crystal superalloy long-term thermal exposure microstructural stability
Funding OrganizationNational Key Research and Development Program ; National Natural Science Foundation of China
DOI10.11900/0412.1961.2019.00091
Indexed BySCI
Language英语
Funding ProjectNational Key Research and Development Program[2016YFB0701400] ; National Natural Science Foundation of China[51331005] ; National Natural Science Foundation of China[51631008]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000492725000008
PublisherSCIENCE PRESS
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/136920
Collection中国科学院金属研究所
Corresponding AuthorLiu Lin
Affiliation1.Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China
2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
Recommended Citation
GB/T 7714
Huang Taiwen,Lu Jing,Xu Yao,et al. Effects of Rhenium and Tantalum on Microstructural Stability of Hot-Corrosion Resistant Single Crystal Superalloys Aged at 900 degrees C[J]. ACTA METALLURGICA SINICA,2019,55(11):1427-1436.
APA Huang Taiwen.,Lu Jing.,Xu Yao.,Wang Dong.,Zhang Jian.,...&Liu Lin.(2019).Effects of Rhenium and Tantalum on Microstructural Stability of Hot-Corrosion Resistant Single Crystal Superalloys Aged at 900 degrees C.ACTA METALLURGICA SINICA,55(11),1427-1436.
MLA Huang Taiwen,et al."Effects of Rhenium and Tantalum on Microstructural Stability of Hot-Corrosion Resistant Single Crystal Superalloys Aged at 900 degrees C".ACTA METALLURGICA SINICA 55.11(2019):1427-1436.
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