Effects of Rhenium and Tantalum on Microstructural Stability of Hot-Corrosion Resistant Single Crystal Superalloys Aged at 900 degrees C

doi:10.11900/0412.1961.2019.00091

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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 Taiwen 1; Lu Jing 1; Xu Yao 1; Wang Dong 2; Zhang Jian 2; Zhang Jiachen 1; Zhang Jun 1; Liu Lin 1
刊名	ACTA METALLURGICA SINICA
	2019-11-11
卷号	55 期号:11 页码:1427-1436
关键词	hot-corrosion resistant single crystal superalloy long-term thermal exposure microstructural stability
ISSN号	0412-1961
DOI	10.11900/0412.1961.2019.00091
通讯作者	Liu Lin(linliu@nwpu.edu.cn)
英文摘要	The 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.
资助项目	National Key Research and Development Program[2016YFB0701400] ; National Natural Science Foundation of China[51331005] ; National Natural Science Foundation of China[51631008]
WOS研究方向	Metallurgy & Metallurgical Engineering
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000492725000008
资助机构	National Key Research and Development Program ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/136922]
专题	金属研究所_中国科学院金属研究所
通讯作者	Liu Lin
作者单位	1.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
推荐引用方式 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.