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为改善YG8硬质合金与45钢的焊接性能,采用Cu_(39.37)Ti_(32.19)Zr_(19.38)Ni_(9.06)(at%)非晶态钎料对YG8硬质合金和45钢进行钎焊。通过XRD、SEM、万能试验机对钎料的微观结构以及钎焊接头形貌、析出相和力学性能进行分析。结果表明:在一定钎焊温度下,随钎焊时间的增加,接头强度逐渐减小,有明显的裂纹,且裂纹在YG8硬质合金一侧反应层中萌生并扩展。在钎焊温度900℃,钎焊时间10 min时获得的抗拉强度最高,约为250 MPa。焊接头强度与YG8硬质合金一侧形成的反应层厚度有关。通过计算得到了反应层厚度形成的激活能Q和反应层生长速度A_0。
In order to improve the welding performance of YG8 cemented carbide and 45 steel, YG8 cemented carbide and 45 steel were brazed with amorphous Cu 39.37 Ti 32.6 Zr 19.38 Ni 9.06 (at%) . By XRD, SEM, universal testing machine on the microstructure of solder and solder joint morphology, precipitation and mechanical properties of the analysis. The results show that at a certain brazing temperature, the joint strength decreases with the increase of brazing time, and there are obvious cracks, and the crack initiation and propagation in the reaction layer on one side of YG8 cemented carbide. At the brazing temperature of 900 ℃, brazing time 10 min obtained the highest tensile strength, about 250 MPa. The strength of the weld is related to the thickness of the reaction layer formed on one side of the YG8 hardmetal. The activation energy Q formed by the thickness of the reaction layer and the growth rate of the reaction layer A_0 were calculated.