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采用CuMn合金为中间层对CuAlBe合金和 1Cr18Ni9Ti不锈钢进行了瞬时液相扩散焊接。通过扫描电镜、电子探针和X射线衍射分析等手段对接头的微观组织和相结构进行了分析 ,并用拉伸试验评价了接头的连接强度。研究结果表明 ,焊接压力、焊接温度、焊接时间及CuMn合金中间层Mn的含量等焊接参数对接头强度影响很大。在本试验中 ,当CuMn中间层中Mn元素含量为 30 %、Tb=12 2 3K、tb=40min、P =1MPa时接头强度最高达到 487MPa ,其断口是韧性断裂。通过分析Mn的作用机理 ,发现Mn元素能够显著改善晶界结构 ,从而提高接头的连接强度。
CuMn alloy as the middle layer of CuAlBe alloy and 1Cr18Ni9Ti stainless steel transient liquid phase diffusion welding. The microstructure and phase structure of the joint were analyzed by scanning electron microscopy, electron probe and X-ray diffraction analysis. The tensile strength of the joint was evaluated by tensile test. The results show that the welding parameters such as welding pressure, welding temperature, welding time and content of Mn in the middle layer of CuMn alloy have a great influence on the joint strength. In this experiment, when the content of Mn element in CuMn intermediate layer is 30%, Tb = 12 2 3K, tb = 40min, P = 1MPa, the joint strength is up to 487MPa, and the fracture is ductile fracture. By analyzing the mechanism of action of Mn, it was found that Mn element can significantly improve the grain boundary structure, thereby improving the connection strength of the joint.