Effect of Ru on the Solidification Microstructure of a Ni-Based Single Crystal Superalloy with High Cr Content

doi:10.11900/0412.1961.2016.00291

IMR OpenIR

	Effect of Ru on the Solidification Microstructure of a Ni-Based Single Crystal Superalloy with High Cr Content
	Ning Likui; Tong Jian; Liu Enze; Tan Zheng; Ji Huisi; Zheng Zhi
通讯作者	Ning Likui(lkning@imr.ac.cn)
	2017-04-11
发表期刊	ACTA METALLURGICA SINICA
ISSN	0412-1961
卷号	53 期号:4 页码:423-432
摘要	Ni-based single crystal superalloys have been widely used in manufacturing the critical components of aero-engines, such as turbine blades and vanes. Improvements in phase stability on the addition of Ru are well known in the field of Ni-based superalloy development. Cr is beneficial to hot corrosion resistance of Ni-based superalloys. Generally, superalloys which used under easy corrosion conditions should contain high levels of Cr. Early researches about the influence of Ru on solidification microstructures in Ni-based single crystal alloys are mostly focused on low-Cr systerms (<6%). Since Cr has complex interactions with Ru, it is meanful to study the effects of Ru on solidification microstructures in high-Cr (>10%) Ni-based single crystal superalloy systems. The materials used in this work are Ni-based single crystal superalloy with high Cr content. Three superalloys by changing Ru addition (0, 1.5%, 3%, mass fraction) were designed. By observing the as-cast structure, the effect of Ru on the elements distribution and the precipitation characters of different phases in these alloys were studied. It is found that as the Ru content increases, the primary and secondary dendrite arm spacings decrease gradually; the volume fraction of (gamma+gamma') eutectic increases firstly and then decreases; the gamma' size is reduced progressively. The addition of 3% Ru leads to the formation of beta-NiAl phase, which contain a certain amount of Cr, Co and Ru except the basic elements Ni and Al. The typical "reverse partitioning" of other alloying elements is exhibited with the addition of Ru, while the formation of b-NiAl phase can reduce the "reverse partitioning" of other alloying elements. The addition of Ru could enhance the segregation of positive segregation elements Ta, Al and negative segregation element Re while reduce the segregation of positive segregation elements Mo and Cr.
关键词	single crystal superalloy Ru beta-NiAl phase reverse partitioning segregation
资助者	National Natural Science Foundation of China
DOI	10.11900/0412.1961.2016.00291
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[51501193]
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000399921900005
出版者	SCIENCE PRESS
引用统计	被引频次：6[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/321006/124645
专题	中国科学院金属研究所
通讯作者	Ning Likui
作者单位	Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Ning Likui,Tong Jian,Liu Enze,et al. Effect of Ru on the Solidification Microstructure of a Ni-Based Single Crystal Superalloy with High Cr Content[J]. ACTA METALLURGICA SINICA,2017,53(4):423-432.
APA	Ning Likui,Tong Jian,Liu Enze,Tan Zheng,Ji Huisi,&Zheng Zhi.(2017).Effect of Ru on the Solidification Microstructure of a Ni-Based Single Crystal Superalloy with High Cr Content.ACTA METALLURGICA SINICA,53(4),423-432.
MLA	Ning Likui,et al."Effect of Ru on the Solidification Microstructure of a Ni-Based Single Crystal Superalloy with High Cr Content".ACTA METALLURGICA SINICA 53.4(2017):423-432.