真空加压钎焊FGH96/DD6接头的组织和性能  

Microstructures and Properties of FGH96/DD6 Joints Brazed at Vacuum Pressure State

作　　者：邹文江[1] 陈波[1] 程耀永[1] 毛唯[1] 熊华平[1] 

机构地区：[1]北京航空材料研究院,北京100095

出　　处：《航空材料学报》2017年第4期14-18,共5页Journal of Aeronautical Materials

基　　金：国家自然科学基金(51305414)

摘　　要：采用Ni-Cr-B钎料分别在1120℃/10 min和1120℃/10 min/2 MPa的工艺下实现FGH96与DD6的钎焊连接。测试两种工艺下接头的抗拉强度,通过光学显微镜(OM)、扫描电子显微镜(SEM)和电子探针(EPMA)分析接头的组织、成分和断口。结果表明:真空加压钎焊所得接头的室温平均抗拉强度达到1187 MPa,远高于真空钎焊接头621 MPa的强度;与不加压的真空钎焊相比,真空加压钎焊所得FGH96/DD6接头的钎缝中心没有平行于被焊面的晶界,而是单个晶粒贯穿整个钎缝,并与母材连接面发生韧性断裂;真空钎焊接头中存在Ni3B相,而真空加压钎焊钎缝中并没有残留的Ni3B相,主要由(Ni,Cr)固溶体组成。Ni-Cr-B brazing filler was used to braze FGH96 and DD6 at 1120 Tl /10 min and 1120 Tl /10 min/2 MPa. The tensile strength of the joints was tested, the microstructures and fractures were observed by OM and SEM, and the reaction products were ana-lyzed by EPMA. The results show that the joints brazed at vacuum pressure process offer the average tensile strength of 1187 MPa, out-class the joints brazed without pressure which has average tensile strength of 621 MPa. Compared with vacuum brazing, the grains of FGH96/DD6 joints brazed by vacuum pressure state penetrate the brazing seam without grain boundary and ductile fracture occurred in the parent metal surface . The Ni3B exists in the joints brazed by vacuum brazing, but it is （Ni, Cr） solid solution in the joints brazed by vacuum pressure brazing instead of Ni3B.

关 键 词：FGH96 DD6 加压钎焊 性能 组织 

分 类 号：TG454[金属学及工艺—焊接]