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Microstructure and hot ductility behavior of Ni-based superalloy U720Li with boron addition
Zhao Guang-Di1; Liu Fang2; Zang Xi-Min1; Sun Wen-Ru2
Corresponding AuthorSun Wen-Ru()
2020-04-27
Source PublicationRARE METALS
ISSN1001-0521
Pages10
AbstractHigh-alloyed superalloy U720Li is difficult to be processed through the conventional cast and wrought route. Boron is an important strengthening element for superalloys, but the role of boron in the hot ductility of U720Li alloy is not clear. This study is focused on the effect of boron addition, in the range of < 0.0005 wt%-0.0240 wt%, on the microstructure and hot ductility behavior of superalloy U720Li. It is found that boron addition significantly increases the content of eutectic (gamma + gamma ') and greatly affects the degree of continuity of the grain boundary eutectic (gamma + gamma ') precipitation. Boron addition dramatically worsens the 1100 degrees C tensile ductility of conventional cast U720Li alloy and causes a change in tensile fracture mode from transgranular to intergranular. The eutectic (gamma + gamma ') represents the most effective site for crack initiation. Boron deteriorates the hot ductility mainly by promoting the continuous precipitation of eutectic (gamma + gamma ') along the grain boundary.
KeywordBoron U720Li Eutectic (gamma plus gamma ') Hot ductility Fracture mechanism
Funding OrganizationNational Natural Science Foundation of China
DOI10.1007/s12598-020-01395-4
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[U1560203]
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000529135000001
PublisherNONFERROUS METALS SOC CHINA
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/138550
Collection中国科学院金属研究所
Corresponding AuthorSun Wen-Ru
Affiliation1.Univ Sci & Technol Liaoning, Sch Met & Mat, Anshan 114051, Peoples R China
2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Zhao Guang-Di,Liu Fang,Zang Xi-Min,et al. Microstructure and hot ductility behavior of Ni-based superalloy U720Li with boron addition[J]. RARE METALS,2020:10.
APA Zhao Guang-Di,Liu Fang,Zang Xi-Min,&Sun Wen-Ru.(2020).Microstructure and hot ductility behavior of Ni-based superalloy U720Li with boron addition.RARE METALS,10.
MLA Zhao Guang-Di,et al."Microstructure and hot ductility behavior of Ni-based superalloy U720Li with boron addition".RARE METALS (2020):10.
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