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Microstructures and high-temperature mechanical properties of a directionally solidified Ni-based superalloy: Influence of boron content
Zhang, H. W.1,2; Wu, Y. S.2; Qin, X. Z.2; Zhou, L. Z.2; Li, X. W.1
Corresponding AuthorQin, X. Z.(xzqin@imr.ac.cn) ; Li, X. W.(xwli@mail.neu.edu.cn)
2018-10-30
Source PublicationJOURNAL OF ALLOYS AND COMPOUNDS
ISSN0925-8388
Volume767Pages:915-923
AbstractThe effects of boron content on the microstructure and mechanical properties of a directionally solidified Ni-based superalloy were investigated. The increase of boron content significantly increases the amount of gamma/gamma' eutectic, impels the formation of multi-phase eutectic-like constituent, and promotes the morphological transformation of MC carbides from rod-like to blocky. After standard heat treatment, the incipient melting occurs in the high boron alloy, which can lower the dissolving temperature of gamma/gamma' eutectic. With increasing boron content, the volume fraction of secondary gamma' phase decreases significantly and the homogeneity and alignment of secondary gamma' show a decrease, and the tensile strengths at 900 degrees C decrease slightly mainly due to the strengthening effect of much more tertiary gamma' phases. The wide gamma matrix channel facilitates the movement of dislocations, which is somewhat beneficial to the elongation, while the incipiently melted region (IMR), the decreased volume fraction of secondary gamma' phase and the less homogeneity of secondary gamma' phase are rather harmful to the elongation. Consequently, the elongation is drastically reduced. The existence of a large amount of IMRs is principally responsible for the reduction of the stress rupture property. Tertiary gamma' phases re-dissolving in g matrix channel facilitates the movement of dislocations between large secondary gamma' phases, which is beneficial to the elongation of the alloys. In addition, the IMRs provide masses of crack sources, and consume the precipitation strengthening elements (Ti, Ta) and the solid solution strengthening elements (Cr, Wand Mo), which plays the major role in the degradation of the high-temperature tensile or stress rupture properties. (C) 2018 Elsevier B.V. All rights reserved.
KeywordDirectionally solidified Ni-based superalloy Boron Microstructure High-temperature tension Stress rupture
Funding OrganizationNational Natural Science Foundation of China (NSFC) ; National High-tech RD Program ; Open Foundation of Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, China
DOI10.1016/j.jallcom.2018.07.162
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China (NSFC)[51571058] ; National Natural Science Foundation of China (NSFC)[51001101] ; National High-tech RD Program[2012AA03A501] ; Open Foundation of Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, China[ATM20170001]
WOS Research AreaChemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectChemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000446316500110
PublisherELSEVIER SCIENCE SA
Citation statistics
Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/129899
Collection中国科学院金属研究所
Corresponding AuthorQin, X. Z.; Li, X. W.
Affiliation1.Northeastern Univ, Dept Mat Phys & Chem, Sch Mat Sci & Engn, Key Lab Anisotropy & Texture Mat,Minist Educ, Shenyang 110819, Liaoning, Peoples R China
2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
Recommended Citation
GB/T 7714
Zhang, H. W.,Wu, Y. S.,Qin, X. Z.,et al. Microstructures and high-temperature mechanical properties of a directionally solidified Ni-based superalloy: Influence of boron content[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2018,767:915-923.
APA Zhang, H. W.,Wu, Y. S.,Qin, X. Z.,Zhou, L. Z.,&Li, X. W..(2018).Microstructures and high-temperature mechanical properties of a directionally solidified Ni-based superalloy: Influence of boron content.JOURNAL OF ALLOYS AND COMPOUNDS,767,915-923.
MLA Zhang, H. W.,et al."Microstructures and high-temperature mechanical properties of a directionally solidified Ni-based superalloy: Influence of boron content".JOURNAL OF ALLOYS AND COMPOUNDS 767(2018):915-923.
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