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Influence of W Content on the Microstructure of Nickel Base Superalloy with High W Content
Hua Hanyu1,2; Xie Jun1; Shu Delong1; Hou Guichen1; Sheng Naicheng1; Yu Jinjiang1; Cui Chuanyong1; Sun Xiaofeng1; Zhou Yizhou1
Corresponding AuthorXie Jun(junxie@imr.ac.cn)
2020-02-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume56Issue:2Pages:161-170
AbstractNickel 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.
Keywordhigh W nickel base alloy alpha-W grain size eutectic
Funding OrganizationNational Natural Science Foundation of China
DOI10.11900/0412.1961.2019.00193
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51701212] ; National Natural Science Foundation of China[51571196] ; National Natural Science Foundation of China[51771191]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000507327100004
PublisherSCIENCE PRESS
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/136696
Collection中国科学院金属研究所
Corresponding AuthorXie Jun
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
2.Northeastern Univ, Sch Met, Shenyang 110819, Peoples R China
Recommended Citation
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.
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