应用Cu-11Sn-2Ni微晶钎料对25Cr3MoA钢和YG6硬质合金进行了真空钎焊, 观察了接头组织形貌, 建立了钎料层/母材原子互扩散模型, 定量分析了焊接区合金元素的分布特征, 并在专用仪器上测试了接头的剪切 强度. 结果表明: 使用铜基微晶钎料钎焊25Cr3MoA和YG6, 润湿性和铺展性良好, 形成的钎缝饱满致密, 接头 钎着率高; 钎缝组织以铜固溶体为主相, 其间分布着Cu3Sn相、富Ni的Cu9NiSn3相以及少量的 γ-Fe相. 铜原子从钎 缝向母材的扩散深度约为25 um. 应用铜基微晶钎料可实现25Cr3MoA与YG6的真空扩散钎焊连接, 接头剪切强 度较高, 达169 MPa.
The vacuum brazing of cemented carbide YG6 and 25Cr3MoA steel was conducted by using a Cu-11%Sn-2%Ni microcrystalline brazing alloy. The microstructure of joint, behavior of atom mutual diffusion and distributions of alloy elements within the joint were analysed. The shearing strength of joints was tested using a special tester. The experimental results show that the Cu-based microcrystalline braze performs an excellent wettability and spreadability during vacuum brazing of 25Cr3MoA/YG6, and the brazing seam obtained is permeated soundly, thus the joint has a higher welding-on rate; the microstructure of brazing seam consists mainly of Cu-rich Cu13.7Sn phase and Ni-rich Cu9NiSn3 phase distributing within the Cu-rich phase. The diffusion range of Cu atoms from brazing seam to base metals reaches to 2.5μm. Therefore, the diffusion brazing of 25Cr3MoA and YG6 has be realized and the shearing strength of joint is high up to 169MPa.
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