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Improve the ductility of a nickel based superalloy by optimizing secondary phase distribution through grain boundary engineering
Mao, Qiang1; Zhang, Mengchao1; Zhi, Yaqian1; Wang, Changshuai2; Li, Hui1
Corresponding AuthorLi, Hui(huili@shu.edu.cn)
2021-11-01
Source PublicationMATERIALS CHARACTERIZATION
ISSN1044-5803
Volume181Pages:10
AbstractThe microstructure and high temperature tensile property of grain boundary engineering (GBE) treated GH984 alloy was studied by electron backscattering diffraction, scanning electron microscopy and transmission electron microscopy. After GBE treatment, the fraction of low Sigma coincidence site lattice (CSL) grain boundary increases from 43.1% to 76.9%. The grain boundary network and grain boundary precipitation distribution were optimized by GBE treatment. During aging at 800 degrees C for 160, 320 and 640 h, the needle-like ri phase and M23C6 carbide precipitated at grain boundaries, both have coherent orientation relationship with matrix. The morphology and distribution of precipitates at grain boundaries with various characters are different. The eta phase is parallel distributed along coherent Sigma 3 grain boundary, perpendicularly precipitated at both side of incoherent Sigma 3 grain boundary, while only precipitated at one side of Sigma 9, Sigma 27 and random grain boundaries. Few fine carbide particles precipitated at Sigma 3 grain boundary, the larger carbide precipitated at Sigma 9, Sigma 27 and random grain boundaries. The high temperature ductility of GBE sample is improved compared with that of solution annealed sample under the same aging treatment. According to the experimental results, the effects of grain boundary characters on the precipitation behaviors of eta phase and carbide, and their influences on the mechanical properties were discussed.
Keywordeta phase Carbide Grain boundary character Grain boundary engineering Nickel based superalloy
Funding OrganizationNational Key Research and Development Program of China
DOI10.1016/j.matchar.2021.111510
Indexed BySCI
Language英语
Funding ProjectNational Key Research and Development Program of China[2016YFB0700401]
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Materials Science, Characterization & Testing
WOS IDWOS:000706135100001
PublisherELSEVIER SCIENCE INC
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/166570
Collection中国科学院金属研究所
Corresponding AuthorLi, Hui
Affiliation1.Shanghai Univ, Sch Mat Sci & Engn, Key Lab Microstruct, Shanghai 200444, Peoples R China
2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Mao, Qiang,Zhang, Mengchao,Zhi, Yaqian,et al. Improve the ductility of a nickel based superalloy by optimizing secondary phase distribution through grain boundary engineering[J]. MATERIALS CHARACTERIZATION,2021,181:10.
APA Mao, Qiang,Zhang, Mengchao,Zhi, Yaqian,Wang, Changshuai,&Li, Hui.(2021).Improve the ductility of a nickel based superalloy by optimizing secondary phase distribution through grain boundary engineering.MATERIALS CHARACTERIZATION,181,10.
MLA Mao, Qiang,et al."Improve the ductility of a nickel based superalloy by optimizing secondary phase distribution through grain boundary engineering".MATERIALS CHARACTERIZATION 181(2021):10.
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