Influence of W Content on the Microstructure of Nickel Base Superalloy with High W Content

doi:10.11900/0412.1961.2019.00193

IMR OpenIR

	Influence of W Content on the Microstructure of Nickel Base Superalloy with High W Content
	Hua Hanyu 1,2; Xie Jun 1; Shu Delong 1; Hou Guichen 1; Sheng Naicheng 1; Yu Jinjiang 1; Cui Chuanyong 1; Sun Xiaofeng 1; Zhou Yizhou 1
通讯作者	Xie Jun(junxie@imr.ac.cn)
	2020-02-11
发表期刊	ACTA METALLURGICA SINICA
ISSN	0412-1961
卷号	56 期号:2 页码:161-170
摘要	Nickel base superalloys are widely used in the preparation of hot end parts for aircraft engines because of their good comprehensive mechanical properties, oxidation resistance and structural stability. It's strengthened mainly by solid solution strengthening, gamma' phase strengthening and carbide strengthening. High alloying is one of the main methods to improve the solid solution strengthening level of nickel base superalloys, where the element W is an efficient alloying element with low price. The control of the W content is extremely important for high W content nickel base superalloys. However, there are few reports on the influence of W content on the microstructure of high W alloy. According to this background, by means of OM, SEM observation and XRD analysis, the influence of W content on the solidified microstructure in nickel base superalloy have been investigated in this work. Results show that when the W content is about 14% (mass fraction, the same below), there is no alpha-W phase being precipitated in the alloy. While as the content of W is higher than 16%, alpha-W could be precipitated during the solidification. On another hand, the grain size of the alloy decreases from 1.04 mm to 0.17 mm and the volume fraction of eutectic increases from 6% to 10% with the increase of the W content. While the content of W has no obvious effect on the sizes and morphologies of gamma' phase in the dendrite and inter-dendrite areas. During solidification, the a-W phase will be first precipitated due to its higher precipitation temperature, and the shrinkage of the residual liquid phase may cause the shift and growth of the alpha-W to the core of the liquid phase. The alpha-W could be as the core of the heterogeneous nucleation to reduce the critical nucleation energy, which is the main reason that the grain size of the 18%W alloy is smaller. During the growth of the dendrites with various orientations, the concentration of Al and Ti in the residual liquid phase may have a higher concentration gradient to cause the occurrence of eutectic transformation, which is the main reason that there is a higher volume fraction of eutectic in 18%W alloy.
关键词	high W nickel base alloy alpha-W grain size eutectic
资助者	National Natural Science Foundation of China
DOI	10.11900/0412.1961.2019.00193
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[51701212] ; National Natural Science Foundation of China[51571196] ; National Natural Science Foundation of China[51771191]
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000507327100004
出版者	SCIENCE PRESS
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/321006/136699
专题	中国科学院金属研究所
通讯作者	Xie Jun
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 2.Northeastern Univ, Sch Met, Shenyang 110819, Peoples R China
推荐引用方式 GB/T 7714	Hua Hanyu,Xie Jun,Shu Delong,et al. Influence of W Content on the Microstructure of Nickel Base Superalloy with High W Content[J]. ACTA METALLURGICA SINICA,2020,56(2):161-170.
APA	Hua Hanyu.,Xie Jun.,Shu Delong.,Hou Guichen.,Sheng Naicheng.,...&Zhou Yizhou.(2020).Influence of W Content on the Microstructure of Nickel Base Superalloy with High W Content.ACTA METALLURGICA SINICA,56(2),161-170.
MLA	Hua Hanyu,et al."Influence of W Content on the Microstructure of Nickel Base Superalloy with High W Content".ACTA METALLURGICA SINICA 56.2(2020):161-170.