Ti600/TC17钛合金惯性摩擦焊接头组织与力学性能研究  

Research of Microstructure and Mechanical Properties of Ti600/TC17 Inertia Friction Welding Joints

作　　者：贺建超[1] 张田仓[1] 何胜春[1] 

机构地区：[1]北京航空制造工程研究所航空焊接与连接技术航空科技重点实验室,北京100024

出　　处：《机械工程学报》2017年第22期95-100,共6页Journal of Mechanical Engineering

摘　　要：采用惯性摩擦焊方法对TC17和Ti600钛合金进行了连接,着重分析接头焊态和热处理条件下的组织特征与力学性能。接头焊态TC17一侧:在热力影响区原始β晶粒发生破碎,晶界以及晶内α相扭曲变形;在再结晶区β晶粒发生动态再结晶形成细小的等轴晶粒,晶内为亚稳态的β相;接头Ti600一侧:在热力影响区片层组织随着金属流动发生变形;在再结晶区,α片层团簇发生再结晶形成大量细小的α片层团簇片层。经过热处理后,TC17钛合金一侧亚稳态β相析出细小的层片状α相,Ti600钛合金一侧层状α相长大,但是不明显。热处理使接头的显微硬度升高,TC17钛合金焊缝一侧显微硬度增加明显。接头抗拉强度与Ti600母材相当,断裂发生在Ti600钛合金一侧,断口为典型的杯锥状断口。Ti600/TC17 is joined by inertia friction welding（IWF）, and the microstructure and mechanical properties of joints is analyzed between as welded and post-weld heat treatment. In the TC17 side：Initial β grain is broken, and grain boundary and α phase is twisted in TC17 thermo-mechanical affect zone（TMAZ）; smaller grain appears in initial β grain under the effect of dynamic recrystallization in the TC17 recrystallization zone（RZ）; In the Ti600 side：lamina α cluster in the grain is distorted following metal extrusion. Initial lamina α cluster is divided into many smaller lamina α cluster. After heat treatment, lamina α appears in the metastable β phase in the TC17 side, and lamina α increase while it is not obviously. Microhardness increases after heat treatment, especially in the TC17 recrystallization zone. Tensile strength is similar to Ti600 basemen and fracture happen in the Ti600 side. Microstructure of fracture is typically cuppy.

关 键 词：异质接头 惯性摩擦焊 微观组织 力学性能 

分 类 号：TG156[金属学及工艺—热处理]