为改善YG8硬质合金与45钢的焊接性能,采用Cu39.37Ti32.19Zr19.38Ni9.06(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A0.
In order to improve the welding performance of YG8 cemented carbide and 45 steel,amorphous Cu39.37 Ti32.19 Zr19.38 Ni9.06 (at％)filler foil was used to braze YG8 cemented carbide and 45 steel.The microstructure and mechanical properties of the weld joint were studied by means of XRD,SEM and universal testing machine.The results show that with the increasing of brazing time,under a constant brazing temperature,the tensile strength of the joint decreases and accompanies by the emergence of crack.Moreover,the cracks are initiated and propagated on the side of reaction layer of YG8 cemented carbide.The maximum tensile strength of the joint is 250 MPa when brazing at 900 ℃ for 10 min.The strength of the joint is significantly affected by reaction layer thickness of YG8 cemented carbide.The activation energy Q and the growth velocity A0 of the reaction layer in the brazed joints are calculated.
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