TC17钛合金线性摩擦焊接头组织及性能

Structure and mechanical property of TC17 linear friction welding joint

摘要: 文中针对航空发动机风扇及压气机盘TC17钛合金材料，开展了接头组织分析、拉伸性能测试及硬度测试，分析了接头不同部位组织特征及形成原因.结果表明，接头明显分为母材区（BM）、热力影响区（TMAZ）和焊合区（WZ），焊接接头中部热力影响区的组织表现为等轴晶粒，而靠近焊缝边缘处热力影响区的晶粒表现为沿着受力方向被拉长，焊合区发生了动态再结晶；接头的拉伸性能与母材相当；接头热力影响区的硬度高于母材和焊合区，平均硬度为486 HV.

Abstract: TC17 titanium alloy which usually used on the fan and compressor disk were selected. Microstructure and mechanical property of joint were investigated. Microstructure character of different part of joint was analyzed also. Results showed that the joints included three zones, base metal (BM), thermal mechanical affected zone (TMAZ) and weld zone(WZ). The microstructure of joint middle part was equiaxial grains, but the bottom part was the elongated grains. Dynamic recrystallation happened at the weld zone. Tensile test result showed that joint tensile strength equal to the TC17 base metal. The average hardness value of the HAZ was 486 HV which was higher than that in the BM and WZ.