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    李鹏

    • 教授     博士生导师   硕士生导师
    • 性别:男
    • 毕业院校:西北工业大学
    • 学位:博士
    • 所在单位:材料科学与工程学院
    • 学科:材料连接技术. 材料加工工程
    • 办公地点:大连理工大学材料科学与工程学院铸造中心206室
    • 联系方式:一三四 七八五五 六八一六
    • 电子邮箱:lipeng2016@dlut.edu.cn

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    Performance of GH4169 brazed joint using a new designed nickel-based filler metal via cluster-plus-glue-atom model

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    论文类型:期刊论文

    发表时间:2020-02-15

    发表刊物:JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY

    收录刊物:EI、SCIE

    卷号:39

    页面范围:89-98

    ISSN号:1005-0302

    关键字:Cluster-plus-glue-atom model; GH4169 alloy; Brazing; Microstructure; Shear strength

    摘要:A novel Ni-Cr-Si-B filler metal with the cluster formula of [Cr-Ni-12]B2Cr + [B-Ni8Cr](3)SiCr based on the cluster-plus-glue-atom model was designed for vacuum brazing GH4169 alloy. The effect of brazing temperature and brazing time on microstructure and shear strength of GH4169 alloy joints was investigated. The brazed seam was mainly composed of gamma-Ni solid solution. (Nb, Ti)-rich phase and (Cr, Nb, Mo)-rich borides distributed in diffusion zones. The diffusion and aggregation of B, Cr, Nb, and Mo resulted in the variation of phase contrast and morphology of borides. Coarse precipitations in the joint brazed at 1240 degrees C consisted of borides, Laves phase and delta phase. The shear strength of joints was principally dominated by the brittle precipitations in diffusion zone, and the homogenization of microstructure improved the room-temperature shear strength to 820 MPa with the high-temperature shear strength of 627 MPa for the joint brazed at 1240 degrees C/20 min. The joint fractured in diffusion zone and brazed seam, and the existence of borides and Laves phase in diffusion zone provide the potential origin for crack growth. (C) 2019 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.