钎焊温度对GH4169/1Cr18Ni9Ti接头组织和性能影响研究

采用BNi82CrSiB镍基钎料真空钎焊GH4169/1Cr18Ni9Ti母材，通过光学显微镜、能谱仪、显微硬度计、拉伸试验机等研究了钎焊温度对钎缝的显微组织、显微硬度、力学性能的影响。结果表明：在1 060～1 100 ℃范围内，接头的钎缝主要由镍基固溶体组成，钎缝中未出现金属间化合物相，钎焊温度的变化对接头的钎缝组织无明显影响。断口分析结果表明：接头断裂均为韧性断裂，断裂区域均处于靠近1Cr18Ni9Ti母材的扩散区中。

Effect of brazing temperature on microstructure and properties of GH4169 / 1Cr18Ni9Ti joints

The GH4169/1Cr18Ni9Ti dissimilar metals was bonded by vacuum brazing using the BNi82CrSiB nickel-based solder. The effect of brazing temperature on the interface microstructure, micro-hardness and joint properties was studied by optical microscopy, energy dispersive spectroscopy, microhardness instrument and tensile testing machine. The results showed that, the joints were mainly composed of nickel-based solid solution in the 1 060-1 100 ℃, and there were no intermetallic phase in the joints. The fracture analysis results showed that all the joints failed with the ductile fracture mode in the diffusion zone closed to the 1Cr18Ni9Ti base metal.