采用非晶箔状BNi82CrSiB和BNi81CrB钎料以不同的保温时间进行钎焊实验,对钎焊接头进行了力学性能测试。利用扫描电镜和能谱分析对钎焊接头微观组织和断口进行观察和分析。结果表明,在钎焊温度下延长钎焊时间(60min)能够促进钎缝与扩散层的元素均匀分布,提高钎焊接头的室温和高温(930℃)拉伸性能。通过调整钎料合金成分,提高了钎焊接头的拉伸性能,高温拉伸性能提高22.5%。接头断裂发生在近缝区基体一侧,断裂形式主要为沿晶断裂。同时讨论了Si,B等元素对钎焊接头的组织和性能的影响。

The superalloy GH586 was brazed with BNi82CrSiB and BNi81CrB amorphous foils for different holding time.The joint strength was tested.The microstructure and fracture surface were analyzed by SEM and EDS.The results show that,when prolonging the brazing time(60min),alloy elements distributed more uniformly in the brazed seam and the diffusion area,and the joint strength not only at room temperature but also at 930℃ was increased.Also the joint tensile properties were increased by adjusting chemical compositions of nickel base filler alloys,and the joint strength at 930℃ was increased 22.5%.The joint fracture occurred at the base metal near the brazed seam,with an intergranular fracture mode.The influence of elements Si and B on the joint microstructures and properties was also discussed.