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Enhancement of multi-pass weld-crack resistance of Co-based superalloys by B-doping
Wen, Mingyue1,2; Sun, Yuan1; Yu, Jinjiang1; Meng, Jie1; Wang, Shiyang1; Dong, Zhiguo3; Niu, Juntao3; Sun, Xiaofeng1; Zhou, Yizhou1
Corresponding AuthorYu, Jinjiang(jjyu@imr.ac.cn) ; Meng, Jie(jmeng@imr.ac.cn)
2021-12-01
Source PublicationMATERIALS CHARACTERIZATION
ISSN1044-5803
Volume182Pages:10
AbstractEnhancing weld-crack resistance of Co-based suerpalloys is of both scientific and practical significance. In this work, the fusion zone weld-crack resistance of Co-9.2Al-9 W-xB (at.%, x = 0, 0.05, 0.20) superalloys during multi-pass fusion welding is investigated. It is found that weld cracks form in fusion zone without B-doping and with B-doping of 0.20%. However, no cracks form in the welded superalloy with 0.05% B alloys, suggesting the weld-crack resistance of Co-based superalloys can be enhanced by a small amount of B-doping. The mechanisms underlying the different weldability of the three Co-based superalloys are clarified. With B-doping of 0.05 at.%, the precipitation of mu-Co7W6 phase on grain boundaries can be fully suppressed, and the internal residual stress is largely reduced. The suppression of precipitated phases and low internal stress in the superalloy with 0.05% B doping account for its much enhanced weld-crack resistance. However, with further B-doping of 0.20%, the M3B2 phase precipitates on the grain boundaries and the internal stress inside grains also increases, which account for the further deterioration of weldabilty. These findings are believed to promote the development of Co-based superalloys with high weld-crack resistance.
KeywordWeld-crack resistance Co-based superalloy B-doping Fusion welding Weldability
DOI10.1016/j.matchar.2021.111527
Indexed BySCI
Language英语
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Materials Science, Characterization & Testing
WOS IDWOS:000711216000003
PublisherELSEVIER SCIENCE INC
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/167114
Collection中国科学院金属研究所
Corresponding AuthorYu, Jinjiang; Meng, Jie
Affiliation1.Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, Shenyang 110016, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
3.AVIC Shenyang Engine Design & Res Inst, Shenyang 110015, Peoples R China
Recommended Citation
GB/T 7714
Wen, Mingyue,Sun, Yuan,Yu, Jinjiang,et al. Enhancement of multi-pass weld-crack resistance of Co-based superalloys by B-doping[J]. MATERIALS CHARACTERIZATION,2021,182:10.
APA Wen, Mingyue.,Sun, Yuan.,Yu, Jinjiang.,Meng, Jie.,Wang, Shiyang.,...&Zhou, Yizhou.(2021).Enhancement of multi-pass weld-crack resistance of Co-based superalloys by B-doping.MATERIALS CHARACTERIZATION,182,10.
MLA Wen, Mingyue,et al."Enhancement of multi-pass weld-crack resistance of Co-based superalloys by B-doping".MATERIALS CHARACTERIZATION 182(2021):10.
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