SS304/BNi-2/SS304高温钎焊对接接头微观结构特征  

Microstructure characteristic of SS304/BNi-2/SS304 butt joint by high temperature brazing

作　　者：竺国荣 陈虎 祝金丹[2] 巩建鸣[3] 

机构地区：[1]宁波市特种设备检验研究院,浙江宁波315020 [2]浙江纺织服装职业技术学院机电与轨道交通学院,浙江宁波315211 [3]南京工业大学机械与动力工程学院,江苏南京210009

出　　处：《焊接技术》2011年第6期4-8,71,共5页Welding Technology

基　　金：国家自然科学基金资助项目(10472043);江苏省自然科学基金预研资助项目(BK2004214)

摘　　要：通过试验手段研究了SS304/BNi-2/SS304钎焊对接接头微观结构特征,使用能谱分析结合合金三元相图研究了接头区域典型的微观结构形貌和特征相变化规律,讨论了降熔元素在接头等温凝固连接过程中所起的关键作用。结果表明,在钎焊温度时,B从液相钎料向固相母材的快速扩散控制了接头的等温凝固过程,也因此决定了接头的微观结构相特征;钎焊接头通常会存在4种典型的相特征区域;钎角质量对于整个钎焊接头性能有重要影响。The microstructure characteristic of SS304/BNi-2/SS304 butt joint was analyzed by high temperature brazing through the experimental research.Some typical microstructural morphologies and phase transition feature of the butt joint were studied by using ternary phase diagrams and EDS analysis.The critical effect of element diffusion on isothermal solidification of brazed joint was also discussed by analyzing the microstructural evolution.The results showed that the quick diffusing of boron from the liquid filler alloy into solid base metal controlled the isothermal solidification process as well as the joint microstructure.Four typical characteristic zones could be observed for the whole brazed joint.The fillet quality played a very important role in the whole joint performance.

关 键 词：微结构 钎焊接头 扩散 高温钎焊 工艺影响 

分 类 号：TG454[金属学及工艺—焊接]