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Microstructure evolution and stress rupture properties of K4750 alloys with various B contents during long-term aging
Li, Xiaoxiao1,2; Ou, Meiqiong1; Wang, Min1; Zha, Xiangdong1; Ma, Yingche1; Liu, Kui1
Corresponding AuthorMa, Yingche(ycma@imr.ac.cn) ; Liu, Kui(kliu@imr.ac.cn)
2021-03-20
Source PublicationJOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN1005-0302
Volume73Pages:108-115
AbstractThe relationship among B content, microstructure evolution and stress rupture properties of K4750 alloy during long-term aging were investigated. After aging at 800 degrees C for 1000 h, the decomposition degree of MC carbides of K4750 alloys with 0B, 0.007 wt. % B and 0.010 wt. % B were basically identical, which indicated that B has no inhibition on MC carbide decomposition during long-term aging. The MC carbide decomposition was accompanied by the formation of M23C6 carbides and a small number of eta phases, which was controlled by the outward diffusion of C and Ti combined with the inward diffusion of Ni and Cr from the gamma matrix. In addition, M23C6 carbides in boron-free alloy were in continuous chain and needle-like eta phases were precipitated near them, while M23C6 carbides in boron-containing alloys remained in granular distribution and no eta phases precipitation around them. Adding B could delay the agglomeration and coarsening of M23C6 carbides during long-term aging, which was because the segregation of B at grain boundary retarded the diffusion of alloy elements, thus weakened the local fluctuation of chemical composition near grain boundary. The stress rupture samples of K4750 alloys with various B contents after aging at 800 degrees C for 1000 h were tested at 750 degrees C/380 MPa. The results indicated that the stress rupture properties of boron-containing alloys were significantly better than that of boron-free alloy, which could be attributed to the increase of grain boundary cohesion strength and the optimization of M23C6 carbide distribution due to the addition of B. (C) 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
KeywordNickel-based superalloy Boron additions Long-term aging Grain boundary segregation Stress rupture properties
DOI10.1016/j.jmst.2020.10.014
Indexed BySCI
Language英语
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000636043900013
PublisherJOURNAL MATER SCI TECHNOL
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/162286
Collection中国科学院金属研究所
Corresponding AuthorMa, Yingche; Liu, Kui
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China
Recommended Citation
GB/T 7714
Li, Xiaoxiao,Ou, Meiqiong,Wang, Min,et al. Microstructure evolution and stress rupture properties of K4750 alloys with various B contents during long-term aging[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2021,73:108-115.
APA Li, Xiaoxiao,Ou, Meiqiong,Wang, Min,Zha, Xiangdong,Ma, Yingche,&Liu, Kui.(2021).Microstructure evolution and stress rupture properties of K4750 alloys with various B contents during long-term aging.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,73,108-115.
MLA Li, Xiaoxiao,et al."Microstructure evolution and stress rupture properties of K4750 alloys with various B contents during long-term aging".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 73(2021):108-115.
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