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Avoiding microstructural instabilities in high tungsten containing superalloys by adjusting Al content
Fei, Xiang1,2; Sheng, Naicheng1; Sun, Shijie1; Fan, Shigang1; Xie, Jun1; Yu, Jinjiang1; Hou, Guichen1; Li, Jinguo1; Zhou, Yizhou1; Sun, Xiaofeng1
通讯作者Sheng, Naicheng(ncsheng@imr.ac.cn) ; Sun, Xiaofeng(xfsun@imr.ac.cn)
2024-06-01
发表期刊MATERIALS CHARACTERIZATION
ISSN1044-5803
卷号212页码:11
摘要The effects of Al contents on the microstructures and mechanical properties of superalloy with high tungsten content were studied. During solidification, Al was found to be enriched in the residual liquid, which led to the transformation of eutectic morphology from reticular to bulk-like. When the Al content increased to 8 wt%, beta-NiAl phase formed in the inter-dendritic region, Thermo-Calc calculations confirms such the experimental phenomenon. The absolute value of the lattice misfit between the gamma/gamma' phases and the elastic strain energy increases, then the size of the gamma' phase increases when the Al concentration rises from 7 wt% to 8 wt%. When the Al content increased to 7 wt%, the tungsten-rich alpha-W phase is precipitated and the volume fraction is 1.20%. The volume fraction of the alpha-W phase increases to 7.84% when the Al content reached 8 wt%, which is consistent with the Thermo-Calc calculation results. After the room temperature tensile and stress rupture life test at 975 degrees C / 235 MPa, it revealed that the precipitation of hard and brittle alpha-W and beta-NiAl phases with high Al content, which resulted in the mechanical properties decreased due to the crack initiation at multiple locations and then interconnected. The higher density of gamma' phase with 6 wt% Al makes it difficult for dislocations to bypass. The site of crack initiation is decreased due to the absense of brittle phase. The stress rupture life can reach 49.21 h of the alloy.
关键词Superalloys Tungsten Thermo-Calc Microstructures Mechanical properties
资助者National Key Research and Development Program of China ; National Postdoctoral Program for Innovative Talents ; National Natural Science Foundation of China ; Liaoning Provincial Natural Science Foundation Project
DOI10.1016/j.matchar.2024.113966
收录类别SCI
语种英语
资助项目National Key Research and Development Program of China[2022YFB3705000] ; National Postdoctoral Program for Innovative Talents[BX2021322] ; National Natural Science Foundation of China[52104352] ; Liaoning Provincial Natural Science Foundation Project[2023 -BS -015]
WOS研究方向Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Materials Science, Characterization & Testing
WOS记录号WOS:001242354700001
出版者ELSEVIER SCIENCE INC
引用统计
文献类型期刊论文
条目标识符http://ir.imr.ac.cn/handle/321006/186819
专题中国科学院金属研究所
通讯作者Sheng, Naicheng; Sun, Xiaofeng
作者单位1.Chinese Acad Sci, Inst Met Res, Shi Changxu Innovat Ctr Adv Mat, Superalloys Div, Shenyang 110016, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
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GB/T 7714
Fei, Xiang,Sheng, Naicheng,Sun, Shijie,et al. Avoiding microstructural instabilities in high tungsten containing superalloys by adjusting Al content[J]. MATERIALS CHARACTERIZATION,2024,212:11.
APA Fei, Xiang.,Sheng, Naicheng.,Sun, Shijie.,Fan, Shigang.,Xie, Jun.,...&Sun, Xiaofeng.(2024).Avoiding microstructural instabilities in high tungsten containing superalloys by adjusting Al content.MATERIALS CHARACTERIZATION,212,11.
MLA Fei, Xiang,et al."Avoiding microstructural instabilities in high tungsten containing superalloys by adjusting Al content".MATERIALS CHARACTERIZATION 212(2024):11.
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