双层卷焊钢管钎焊接头的形成机制  

Forming mechanism of the brazed joint of double wall brazed tube

作　　者：程振邦[1] 王洪新[1] 张刚[1,2] 林华[1] 

机构地区：[1]皖西学院机械与电子工程学院,安徽六安237012 [2]皖西学院量子调控与自动化研究所,安徽六安237012

出　　处：《钢铁研究学报》2016年第11期51-55,共5页Journal of Iron and Steel Research

基　　金：安徽省自然科学基金资助项目(1408085MA20);安徽省高校优秀青年人才支持计划重点资助项目(gxyqZD2016242);安徽省教育厅高校自然科学研究资助项目(WXZQ1406)

摘　　要：采用金相显微镜、超景深三维显微系统、扫描电镜对双层卷焊钢管钎焊接头的组织结构进行了研究。结果表明:双层卷焊钢管钎焊接头的铜钢复合界面结合方式为冶金结合且界面结合良好;双层卷焊钢管钎焊接头由扩散区和中界区组成。扩散区组织是α固溶体和ε固溶体的混合物,即(α+ε)。中界区的基体组织是铁在铜中的过饱和固溶体Cu(ss.Fe)并且在基体上稀疏地分布着(α+ε)双相固溶体;基于对双层卷焊钢管钎焊接头组织结构的观察,分析认为其接头的形成是由铜层熔化阶段、液固相互扩散阶段、凝固阶段组成。The microstructure of the brazed joint of double wall brazed tube was studied by using metallographic microscope,ultra-depth three-dimensional microscope system and scanning electron microscope.The results show that the copper-steel interface of the brazed joint of double wall brazed tube is metallurgical bond and combines well.The brazed joint of double wall brazed tube is made up of diffusion zone and central-interfacial zone.The microstructure of diffusion zone is a mixture ofαsolid solution andεsolid solution,namely（α＋ε）phase.The matrix microstructure of central-interfacial zone is Cu（ss.Fe）phase which is a supersaturated solid solution of iron in copper and（α＋ε）phase is sparsely distributed on matrix.Based on the observations of its microstructure,the forming process of the brazed joint of double wall brazed tube is composed of three stages：copper layer melting stage,liquid-solid interdiffusing stage and solidifying stage.

关 键 词：双层卷焊钢管 钎焊接头 铜钢复合界面 组织结构 形成机制 

分 类 号：TG454[金属学及工艺—焊接]