热模拟MHC/GH4099扩散钎焊接头的组织与力学性能  

Microstructure and mechanical properties of thermal simulated MHC/GH4099 diffusion brazing joints

作　　者：车洪艳[1,2] 郑天明 王恒霖 董浩 闫英杰[3] 曹睿 CHE Hongyan;ZHENG Tianming;WANG Henglin;DONG Hao;YAN Yingjie;CAO Rui(Advanced Technology&Materials Limited Company,China Iron&Steel Research Institute Group,Beijing,100081,China;Engineering and Technology Research Center of Hot Isostatic Pressing,Zhuozhou,072750,China;State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology,Lanzhou,730050,China)

机构地区：[1]中国钢研科技集团有限公司,安泰科技股份有限公司,北京100081 [2]河北省热等静压工程技术研究中心,涿州072750 [3]兰州理工大学,有色金属先进加工与再利用省部共建国家重点实验室,兰州730050

出　　处：《焊接学报》2021年第9期15-20,I0001,I0002,共8页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(52175325,51761027);甘肃省教育厅“双一流”科研重点项目(GSSYLXM-03).

摘　　要：采用NiCrSiB中间层在热模拟机上成功实现了难熔合金钼-铪-碳(MHC)与镍基高温合金GH4099的真空扩散连接;通过扫描电子显微镜(SEM)、能谱仪(EDS)和X射线衍射(XRD)对接头的微观组织进行表征;同时研究了不同连接温度对接头组织和力学性能的影响.结果表明,在950,1000和1050℃保温600 s时均可获得可靠的焊接接头;MHC/GH4099接头主要由γ-Ni基固溶体、CrMo固溶体、NiMo,CrB以及Ni_(3)Si等相组成;在1050℃焊接时,接头室温抗剪强度最高,可达116 MPa.MHC侧焊接热影响区存在较大的焊后应力集中,是引起接头发生脆性断裂的主要原因.The molybdenum alloy(MHC)and the nickel alloy(GH4099)were successfully joined with NiCrSiB as the interlayer by the Gleeble-3800 thermal simulated machine.Microstructure of MHC/GH4099 welded joints were characterized by scanning electron microscope(SEM),energy dispersive scanning(EDS)and X-ray diffraction(XRD).The effects of bonding temperature on microstructure and shear strength were also investigated.Results indicated that a reliable welded joint can be obtained at peak temperatures of 950℃,1000℃ and 1050℃ and holding time of 600 s.The MHC/GH4099 joints were mainly composed of γ-Ni solid solution,CrMo solid solution,MoNi and CrB,Ni_(3)Si phase.The shear strength of the joint at 1050℃ can reach 116 MPa.The larger stress concentration in the heat affected zone of MHC side was the main reason of brittle fracture for MHC/GH4099 joints.

关 键 词：钼铪碳 镍基高温合金 扩散钎焊 热模拟 

分 类 号：TG453[金属学及工艺—焊接]