采用BNi82CrSiB钎料钎焊1Cr12Ni3MoVN不锈钢的接头组织及性能

Microstructures and mechanical properties of brazing 1Cr12Ni3MoVN stainless steel joints with BNi82CrSiB filler metal

采用BNi82CrSiB(BNi-2)钎料真空钎焊1Cr12Ni3MoVN不锈钢材料,分析了接头的组织和力学性能。结果表明:BNi82CrSiB钎料可用于真空钎焊1Cr12Ni3MoVN不锈钢,采用1070℃/15 min钎焊工艺能够形成完整接头;1070℃/15 min钎焊之后增加940℃/1 h扩散处理,钎缝宽度减少,组织更加均匀,接头的室温平均抗拉强度提高至382.0 MPa,较未经扩散处理接头强度提升约50%;拉伸试样断口呈脆性断裂特征,断裂位置为焊缝处。

In this study,the brazing experiments of 1Cr12Ni3MoVN stainless steel were carried out using BNi82CrSiB(i.e.BNi-2)filler metal.Microstructure and mechanical property of the brazed joints were analyzed.The results revealed that sound joints could be obtained by using BNi-2 filler metal brazed at brazing temperature of 1070℃ for 15 min.The diffusion treatment at temperature of 940℃ for 1h after brazing at 1070℃ could decrease the width of seam and refine the microstructure.After diffusion treatment,the average tensile strength of the joint was obviously increased up to 382.0MPa,but the tensile specimen still exhibited brittle fracture mode and the fracture occurred in the brazing seam.