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MICROSTRUCTURE EVOLUTION AND INTERFACIAL FORMATION MECHANISM OF WIDE GAP BRAZING OF DD5 SINGLE CRYSTAL SUPERALLOY
Sun Yuan; Liu Jide; Hou Xingyu; Wang Guanglei; Yang Jinxia; Jin Tao; Zhou Yizhou
Corresponding AuthorZhou Yizhou(yzzhou@imr.ac.cn)
2016-07-01
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume52Issue:7Pages:875-882
AbstractNi-based single-crystal superalloy DD5 has excellent high temperature properties, which is the preferred raw material for aero-engine turbine blade in recent year. In this research, DD5 superalloy was brazed by different contents of Ni-Co-Cr-W-B+DD99 mixed powder filler alloy. The microstructure evolution and interfacial formation mechanism of DD5 superalloy brazing joint were analyzed by SEM and EPMA. The mechanical properties of joint after solid solution treatment and aging treatment were tested. The results show that gamma-Ni primary phase formed firstly in the Ni-Co-Cr-W-B/DD99 interface during the brazing process, and then B element segregated and precipitated to fine granular M3B2 type boride. The residual liquid phase solidified and formed lastly to the M3B2 phase, gamma+gamma' eutectic phase and gamma-Ni+Ni3B+CrB eutectic phase during cooling. With increasing the ratio of DD99 in mixed powder filler alloy, the low melting point eutectic phase and borides in the joint decrease and the uniformity of composition and microstructure of joint improve. When the ratio of DD99 increased to 70% (mass fraction) in the mixed powder filler alloy, it can be observed that element of B diffused to DD99 additive powder which resulted in the decrease of low melting point eutectic phases and brittle compounds. The high temperature tensile properties of joint is 1010 MPa at 870 degrees C.
Keywordsingle crystal superalloy wide gap brazing mixed powder filler alloy microstructure mechanical property
Funding OrganizationNational Natural Science Foundation of China ; High Technology Research and Development Program of China
DOI10.11900/0412.1961.2015.00622
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51401210] ; National Natural Science Foundation of China[51331005] ; High Technology Research and Development Program of China[2014AA041701]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000385747800013
PublisherSCIENCE PRESS
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/123040
Collection中国科学院金属研究所
Corresponding AuthorZhou Yizhou
AffiliationChinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Sun Yuan,Liu Jide,Hou Xingyu,et al. MICROSTRUCTURE EVOLUTION AND INTERFACIAL FORMATION MECHANISM OF WIDE GAP BRAZING OF DD5 SINGLE CRYSTAL SUPERALLOY[J]. ACTA METALLURGICA SINICA,2016,52(7):875-882.
APA Sun Yuan.,Liu Jide.,Hou Xingyu.,Wang Guanglei.,Yang Jinxia.,...&Zhou Yizhou.(2016).MICROSTRUCTURE EVOLUTION AND INTERFACIAL FORMATION MECHANISM OF WIDE GAP BRAZING OF DD5 SINGLE CRYSTAL SUPERALLOY.ACTA METALLURGICA SINICA,52(7),875-882.
MLA Sun Yuan,et al."MICROSTRUCTURE EVOLUTION AND INTERFACIAL FORMATION MECHANISM OF WIDE GAP BRAZING OF DD5 SINGLE CRYSTAL SUPERALLOY".ACTA METALLURGICA SINICA 52.7(2016):875-882.
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