线性摩擦焊接头形成过程及机理  

Formation Process and Mechanism of Linear Friction Welding Joint

作　　者：张传臣[1] 张田仓[1] 季亚娟[1] 黄继华[2] 

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 [2]北京科技大学材料科学与工程学院,北京100083

出　　处：《材料工程》2015年第11期39-43,共5页Journal of Materials Engineering

摘　　要：分析了异质钛合金线性摩擦焊接头焊合线近域组织结构,结合飞边形貌及组织特点,探讨了线性摩擦焊接头的形成机理。结果表明,在线性摩擦焊接过程中摩擦界面温度超过钛合金基体材料相变点,焊后摩擦界面两侧均有高温塑性层残留并发生再结晶,焊缝区为完全再结晶组织,TC11侧焊缝区为细小针状组织,TC17侧焊缝区为亚稳态β组织。异质钛合金线性摩擦接头形成机理研究表明,在线性摩擦焊接过程中以及焊后摩擦界面始终存在,界面两侧的高温黏塑性金属没有发生机械混合,界面两侧原子发生了扩散迁移现象,在接头结合界面处形成扩散过渡区。摩擦焊通过扩散与再结晶的共同作用形成焊接接头。The microstructure of the joint interface in linear friction welding was analyzed. Combined with the flash pattern and characteristic,the formation mechanism of the joint was discussed. The re- sults show that during linear friction welding, the friction interface temperature exceedS the ^-transus temperature of the base metal, a small amount of viscoplastic metal with high temperature is retained at the interface, and the recrystallization occurs in it. After welding, the weld zone is complete recrys- tallized structure. The side weld zone of TC11 is mainly composed of acicular structure with random distribution and is single ~ for that of TC17. The formation mechanism of the welded joints shows that during linear friction welding, the friction interface always exists. During LFW, the viscoplastic metal with high temperature is not mixed and the weld joint is formed through the atoms interdiffusion. Un- der the combined effect of diffusion and recrystallization, the weld joint is formed.

关 键 词：线性摩擦焊 界面 形成机理 扩散 

分 类 号：TG453.9[金属学及工艺—焊接]