高速钢与弹簧钢的真空压力焊

Vacuum Pressure Welding of High Speed Steel and Spring Steel

采用拉伸试验、弯曲试验、硬度试验、扫描电镜断口形貌观察等方法研究了高速钢W6Mo5Cr4V2(M2)与合金弹簧钢50CrVA的真空压力焊。结果表明:在焊接温度为1 150℃及以上,焊接压力为20 MPa、保温时间为30 min、真空度不低于0.1 Pa的条件下即可实现高速钢与合金弹簧钢良好的冶金结合;拉伸和弯曲试验的断裂均发生在高硬度高耐磨的M2上。因此,可以认为焊接结合面的强度已经高于M2的抗拉强度与抗弯强度。

The vacuum pressure welding of high speed steel W6Mo5Cr4V2 （M2） with alloy spring steel 50CrVA was studied by means of hardness test, tensile test, bending test, SEM analysis. The results show that a sound metallurgical bonding is obtained between two dissimilar materials at above 1150 ℃ for 30 minutes, bonding pressure 20 MPa and the vacuum level ≥ 0.1 Pa. The fracture of tensile and bending test both occurs to the M2, which has higher hardness and wear-resistance; therefore, it can be seen that the strength of bonding zone is higher than that of M2 matrix.