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采用高频感应钎焊方法连接了航天推进系统的异种金属(钛合金与不锈钢)薄壁小直径导管结构,结构的质量和性能远远优于螺栓连接的导管结构.钎焊接头静态拉伸试验发现,银基钎料钎焊的接头承载能力要优于铜基钎料.对静态拉伸断裂接头的微观组织进行了分析,结果发现,银基钎料钎焊的接头区域出现的裂纹仅在钎缝区域萌生和扩展,当裂纹扩展到钎缝与母材的界面位置时停止扩展.铜基钎料钎焊的接头区域的裂纹从3个位置萌生:钎缝2种组织的交界处,钎缝与钛合金、不锈钢的界面.裂纹驱动力主要是由静态拉伸载荷和异种金属钎焊接头失配行为构成的,而裂纹扩展抗力主要与钎焊接头的微观组织有关.
The high-frequency induction brazing method is used to connect the thin-walled and small-diameter catheter structures of dissimilar metals (titanium alloy and stainless steel) of aerospace propulsion system, the quality and performance of the structure are far superior to that of the bolted catheter structure. Static Tensile Test It is found that the bearing capacity of silver-based brazing filler metal is better than that of copper-based brazing filler metal.The microstructure of static tensile-splitting joint is analyzed and the results show that the cracks appeared in the brazing joint of silver- Brazing seam area initiation and expansion, when the crack extends to the interface between the brazing seam and the parent material to stop expanding. Brazing copper brazing joints crack initiation from three locations: brazing seam at the junction of two organizations, brazing Cracks and titanium alloy, stainless steel interface Crack driving force is mainly composed of static tensile load and dissimilar metal brazing joint mismatch behavior, and crack propagation resistance mainly with the microstructure of the brazed joints.