Microstructures of Nickel-base Single-Crystal Superalloy Prepared by Laser Solid Forming

IMR OpenIR

	Microstructures of Nickel-base Single-Crystal Superalloy Prepared by Laser Solid Forming
	Liang Jingjing; Yang Yanhong; Zhou Yizhou; Li Jinguo; Wang Liang; Jin Tao; Sun Xiaofeng
通讯作者	Liang Jingjing(jjliang@imr.ac.cn)
	2017-12-01
发表期刊	RARE METAL MATERIALS AND ENGINEERING
ISSN	1002-185X
卷号	46 期号:12 页码:3753-3759
摘要	Single-crystal superalloys have been commonly used in modern advanced aero engines to produce high-pressure high-temperature turbine blades. In order to extend the lifetime of single-crystal turbine blades, repair of cracked and worn ones is of great interest. Laser Solid Forming (LSF) is a prospective technology that can be used to repair single-crystal blades. In this study, the microstructure of the as-deposited and heat-treated LSF single-crystal superalloy has been characterized through optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The as-deposited LSF sample shows a directionally solidified columnar dendrites growing almost parallel to the building direction. Between the dendrites, nearly round microporosity and blocky MC carbide particles are dispersed uniformly. TEM results indicate that many nano gamma' particles precipitate in gamma matrix. In addition, during LSF deposition process, stress is formed, which generates plenty of dislocations. During heat treatment, the LSF sample experiences full recrystallization. The recrystallization grains are in different sizes, and twins are found in some recrystallized grains. Because the residual stress is fully released during heat treatment, the size and shape of gamma' precipitates in the recrystallized and un-recrystallized regions are similar to those in conventionally cast samples.
关键词	laser solid forming single crystal superalloy heat treatment recrystallization
收录类别	SCI
语种	英语
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000425203200028
出版者	NORTHWEST INST NONFERROUS METAL RESEARCH
引用统计	被引频次：5[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/321006/127396
专题	中国科学院金属研究所
通讯作者	Liang Jingjing
作者单位	Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
推荐引用方式 GB/T 7714	Liang Jingjing,Yang Yanhong,Zhou Yizhou,et al. Microstructures of Nickel-base Single-Crystal Superalloy Prepared by Laser Solid Forming[J]. RARE METAL MATERIALS AND ENGINEERING,2017,46(12):3753-3759.
APA	Liang Jingjing.,Yang Yanhong.,Zhou Yizhou.,Li Jinguo.,Wang Liang.,...&Sun Xiaofeng.(2017).Microstructures of Nickel-base Single-Crystal Superalloy Prepared by Laser Solid Forming.RARE METAL MATERIALS AND ENGINEERING,46(12),3753-3759.
MLA	Liang Jingjing,et al."Microstructures of Nickel-base Single-Crystal Superalloy Prepared by Laser Solid Forming".RARE METAL MATERIALS AND ENGINEERING 46.12(2017):3753-3759.