Mo-Cu合金与1Cr18Ni9Ti不锈钢真空钎焊接头的组织性能

摘要

Mo-Cu alloy and lCrl8Ni9Ti stainless steel were joined by vacuum brazing with Ag-Cu-Ti active filler metal at 910 ℃ for 20 min and a Mo-Cu/lCrl8Ni9Ti joint with a shear strength of 75 MPa was obtained. The microstructure and performance of Mo-Cu/lCrl8Ni9Ti joint were investigated by scanning electron microscope ( SEM ) , energy dispersive spectrometer ( EDS) and microhardness test. The results indicated that Ag-Cu eutectic and Cu-rich phase were produced in the brazed joint. There were few of TiC phases near the side of lCrl8Ni9Ti stainless steel in the joint. The microhardness of brazed seam was lower than that of Mo-Cu alloy and lCrl8Ni9Ti stainless steel. There are no brittle compounds formed in the Mo-Cu/lCrl8Ni9Ti joint. The shear fracture appearance shows shear dimple feature.%采用Ag-Cu-Ti钎料,控制钎焊温度为910℃,保温时间为20 min,可以实现Mo-Cu合金与1Cr1 8Ni9Ti不锈钢的真空钎焊,接头抗剪强度为75 MPa.采用扫描电镜、能谱分析仪和显微硬度计对Mo-Cu/1 Cr18 Ni9Ti接头组织特征及性能进行分析.结果表明,钎焊接头靠近1Cr18Ni9Ti钢一侧,主要形成Ag-Cu共晶组织和少量的TiC相；靠近Mo-Cu合金一侧,Ag,Cu元素在合金与钎缝间相向扩散,共晶组织消失,以富铜相为主.钎缝的显微硬度明显低于Mo-Cu合金和1Cr18Ni9Ti不锈钢母材,无脆性化合物生成,剪切断口呈现剪切韧窝的形貌特征.