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MICROSTRUCTURE EVOLUTION AND MECHANICAL PROPERTIES OF DD5 SINGLE CRYSTAL SUPERALLOY JOINT BRAZED BY Co-BASED FILLER ALLOY
Alternative TitleMICROSTRUCTURE EVOLUTION AND MECHANICAL PROPERTIES OF DD5 SINGLE CRYSTAL SUPERALLOY JOINT BRAZED BY Co—BASED FILLER ALLOY
Sun Yuan1; Liu Jide1; Liu Zhongming2; Yang Jinxia1; Li Jinguo1; Jin Tao1; Sun Xiaofeng1
2013
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume49Issue:12Pages:1581-1589
AbstractThe single crystal supperalloy DD5 was brazed using Co-Ni-Si-B filler alloy at 1453 K. The microstructure of joint and effect of brazing time on the microstructure and mechanical properties were investigated by SEM, EPMA and TEM. The formation mechanism of joint was discussed deeply. The result indicates that three distinct regions can be identified in a joint: the filler alloy zone, interfacial bonding zone, element diffusion zone. The filler alloy zone in the center of joint consists of Ni-Co solid solution, M3B2-type boride, CrB and Ni-Si compounds. The interfacial bonding zone adjacent to the filler alloy zone is composed of Ni-Co solid solution formed isothermally at brazing temperature. The element diffusion zone between the interfacial bonding zone and substrate consists of gamma phase, gamma' phase and granular M3B2 phase which was formed in element diffusion. With extending brazing time, the brazing defects reduce, the thickness of bonding layer and the size of spherical Ni-Co solid solution in the filler alloy zone increase, and the brittle compounds reduce. The tensile strength at 1143 K increases from 198.5 MPa to 580 MPa. The investigation on fracture of high temperature tensile specimens exhibits that the fracture occurred in the seam and the fractural model is a mixed fracture. Through extending brazing time the bonding strength between seam and substrate can be improved, the brittle compounds can be controlled and the mechanical properties of joint are improved. The analysis results of microstructure and properties also imply that the optimum holding time would be 180 min.
Keywordbrazing single crystal superalloy Co-based filler alloy microstructure mechanical properties
Indexed ByCSCD
Language英语
Funding Project[National Basic Research Program of China] ; [National Natural Science Foundation of China]
CSCD IDCSCD:5025730
Citation statistics
Cited Times:5[CSCD]   [CSCD Record]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/153516
Collection中国科学院金属研究所
Affiliation1.中国科学院
2.中国科学院金属研究所
Recommended Citation
GB/T 7714
Sun Yuan,Liu Jide,Liu Zhongming,et al. MICROSTRUCTURE EVOLUTION AND MECHANICAL PROPERTIES OF DD5 SINGLE CRYSTAL SUPERALLOY JOINT BRAZED BY Co-BASED FILLER ALLOY[J]. ACTA METALLURGICA SINICA,2013,49(12):1581-1589.
APA Sun Yuan.,Liu Jide.,Liu Zhongming.,Yang Jinxia.,Li Jinguo.,...&Sun Xiaofeng.(2013).MICROSTRUCTURE EVOLUTION AND MECHANICAL PROPERTIES OF DD5 SINGLE CRYSTAL SUPERALLOY JOINT BRAZED BY Co-BASED FILLER ALLOY.ACTA METALLURGICA SINICA,49(12),1581-1589.
MLA Sun Yuan,et al."MICROSTRUCTURE EVOLUTION AND MECHANICAL PROPERTIES OF DD5 SINGLE CRYSTAL SUPERALLOY JOINT BRAZED BY Co-BASED FILLER ALLOY".ACTA METALLURGICA SINICA 49.12(2013):1581-1589.
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