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Effect of boron addition on the microstructure and mechanical properties of K4750 nickel-based superalloy
Li, Xiaoxiao1,2; Ou, Meiqiong1; Wang, Min1; Zhang, Long1; Ma, Yingche1; Liu, Kui1
Corresponding AuthorMa, Yingche(ycma@imr.ac.cn) ; Liu, Kui(kliu@imr.ac.cn)
2021-01-10
Source PublicationJOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN1005-0302
Volume60Pages:177-185
AbstractThe effect of boron addition at 0, 0.007 wt. % and 0.010 wt. % on the microstructure and mechanical properties of K4750 nickel-based superalloy was studied. The microstructure of the as-cast and heat-treated alloys was analyzed by SEM, EPMA, SIMS and TEM. Lamellar M5B3-type borides were observed in boron-containing as-cast alloys. After the full heat treatment, boron atoms released from the decomposition of M5B3 borides were segregated at grain boundaries, which inhibited the growth and agglomeration of M23C6 carbides. Therefore, the M23C6 carbides along grain boundaries were granular in boron-containing alloys, while those were continuous in boron-free alloys. The mechanical property analysis indicated that the addition of boron significantly improved the tensile ductility at room temperature and stress rupture properties at 750 degrees C/430 MPa of K4750 alloy. The low tensile ductility at room temperature of OB alloy was attributed to continuous M23C6 carbides leaded to stress concentration, which provided a favorable location for crack nucleation and propagation. The improvement of the stress rupture properties of boron-containing alloys was the result of the combination of boron segregation increased the cohesion of grain boundaries and granular M23C6 carbides suppressed the link-up and extension of micro-cracks. (C) 2020 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
KeywordNickel-based superalloy Boron addition Secondary ion mass spectrometry (SIMS) Grain boundary segregation Mechanical properties
DOI10.1016/j.jmst.2020.02.079
Indexed BySCI
Language英语
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000594138800020
PublisherJOURNAL MATER SCI TECHNOL
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/158723
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. Effect of boron addition on the microstructure and mechanical properties of K4750 nickel-based superalloy[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2021,60:177-185.
APA Li, Xiaoxiao,Ou, Meiqiong,Wang, Min,Zhang, Long,Ma, Yingche,&Liu, Kui.(2021).Effect of boron addition on the microstructure and mechanical properties of K4750 nickel-based superalloy.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,60,177-185.
MLA Li, Xiaoxiao,et al."Effect of boron addition on the microstructure and mechanical properties of K4750 nickel-based superalloy".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 60(2021):177-185.
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