Microstructural Instability of an Experimental Nickel-Based Single-Crystal Superalloy

doi:10.1007/s40195-020-01057-5

IMR OpenIR

	Microstructural Instability of an Experimental Nickel-Based Single-Crystal Superalloy
	Yin, Bin 1,2; Xie, Guang 1; Jiang, Xiangwei 1; Zhang, Shaohua 1; Zheng, Wei 1; Lou, Langhong 1
通讯作者	Xie, Guang(gxie@imr.ac.cn)
	2020-05-12
发表期刊	ACTA METALLURGICA SINICA-ENGLISH LETTERS
ISSN	1006-7191
卷号	33 期号:10 页码:9
摘要	Microstructural instability with the precipitation of topologically close-packed (TCP) phases of an experimental nickel-based single-crystal superalloy has been investigated. A significant amount of sigma phases are distinguished in the interdendritic region of the as-cast samples after thermal exposure at 900 degrees C for 1000 h. The sigma phases are preferentially precipitated at the periphery of coarse gamma/gamma ' eutectic, and their morphological evolution from needles to granules is observed. Microstructural analysis suggests that the local segregation of Cr and Ti at the periphery of coarse gamma/gamma ' eutectic accounts for the formation of sigma phases in the as-cast samples. After heat treatment with low solution temperature and short holding time, the dendritic segregation of alloying elements (i.e., W, Re, Ti and Ta) and the volume fraction of gamma ' phase in the interdendritic region are similar to that of the as-cast samples. However, no TCP phases are present in the interdendritic region of the heat-treated samples after thermal exposure, which is primarily ascribed to the elimination of local segregation of Cr and Ti near the coarse gamma/gamma ' eutectic. Moreover, small quantities of mu phases are precipitated in the secondary dendrite arm near the interdendritic region after thermal exposure, due to the increased volume fraction of gamma ' phase and the concomitant enrichment of W and Re in the gamma matrix.
关键词	Nickel-based single-crystal superalloy Topologically close-packed (TCP) phases Segregation Eutectic
资助者	National Natural Science Foundation of China ; National Science and Technology Major Project
DOI	10.1007/s40195-020-01057-5
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[51771204] ; National Natural Science Foundation of China[U1732131] ; National Natural Science Foundation of China[51911530154] ; National Natural Science Foundation of China[91860201] ; National Natural Science Foundation of China[51631008] ; National Science and Technology Major Project[2017-VII-0008-0101]
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000532131500002
出版者	CHINESE ACAD SCIENCES, INST METAL RESEARCH
引用统计	被引频次：8[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/138764
专题	中国科学院金属研究所
通讯作者	Xie, Guang
作者单位	1.Chinese Acad Sci, Inst Met Res, Superalloys Div, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China
推荐引用方式 GB/T 7714	Yin, Bin,Xie, Guang,Jiang, Xiangwei,et al. Microstructural Instability of an Experimental Nickel-Based Single-Crystal Superalloy[J]. ACTA METALLURGICA SINICA-ENGLISH LETTERS,2020,33(10):9.
APA	Yin, Bin,Xie, Guang,Jiang, Xiangwei,Zhang, Shaohua,Zheng, Wei,&Lou, Langhong.(2020).Microstructural Instability of an Experimental Nickel-Based Single-Crystal Superalloy.ACTA METALLURGICA SINICA-ENGLISH LETTERS,33(10),9.
MLA	Yin, Bin,et al."Microstructural Instability of an Experimental Nickel-Based Single-Crystal Superalloy".ACTA METALLURGICA SINICA-ENGLISH LETTERS 33.10(2020):9.