5CrMnMo钢与YG8硬质合金的真空钎焊

Vacuum Brazing of 5CrMnMo Steel and YG8 Hard Metal

选用CuMnNi钎料,研究了5CrMnMo钢与YG8硬质合金的真空钎焊工艺。通过DSC确定了钎料的熔化温度范围;通过三点弯曲试验、润湿性试验、金相分析、SEM及EDS等手段探索了钎焊温度和Ni中间夹层厚度对钎焊接头性能的影响。结果表明,添加0.05mmNi中间层在1045℃下钎焊,钎料与母材、中间层结合较好,无裂纹等缺陷,此时接头的强度最高。

The vacuum brazing process of 5CrMnMo steel and YG8 hard metal were studied by using CuMnNi filler metal. Through the methods of hardness testing and DSC, melting temperature of the filler metal was decided. The effects of vacuum brazing temperature and Ni interlayer thickness on bending strength of the brazed joint were studied by the methods of three-bend test, wetting angle test, metallographic analysis and hardness test. The results show that Ni interlayer thickness of adding 0.05 mm under brazing at 1 045℃, the filler metal, the matrix and the interlayer are joined better, and have no defects, at the meantime, the strength of joints is the highest.