焊后消应力对TC4钛合金电子束焊接接头组织和性能的影响  

Effect of Heat treatment on Microstructure and Properties of EBW TC4 Titanium Alloy Joints

作　　者：刘永强 庄明祥 章文亮 王维贤 LIU Yongqiang;ZHUANG Mingxiang;ZHANG Wenliang;WANG Weixian(Xi'an Aircraft Industrial Corporation Co.,Ltd.,Xi'an 710089,China;Materials Science and Engineering College,Chongqing University,Chongqing 400045,China)

机构地区：[1]中航西安飞机工业集团股份有限公司,陕西西安710089 [2]重庆大学材料科学与工程学院,重庆400045

出　　处：《电焊机》2023年第10期22-27,共6页Electric Welding Machine

摘　　要：研究去应力退火和完全退火两种热处理状态下30 mm厚TC4钛合金电子束焊接接头的组织和性能。结果表明:两种热处理状态下,接头的组织构成类似,BW区以等轴α相+板条状α相与晶间β相组成的双相组织,HAZ区由初生α相、针状马氏体α′相以及板条状α相和β相的双相组织组成,WM区主要由大量的针状马氏体α′相和少量分布在原始β晶界的α相组成。与去应力退火状态相比,在完全退火状态下,接头整体组织更加均匀,α相球化程度更高,抗拉能力更强,抗冲击性能更弱。The microstructures and properties of EBW joint of 30 mm TC4 titanium alloy under two heat treatment condi‐tions of stress relief annealing and full annealing were studied.The results show that the microstructure of the joint is similar under two heat treatment conditions.The BM is mainly composed of equiaxedαphase plus two-phase structure consisting of lathαphase and intercrystallineβphase,and the HAZ is composed of primaryαphase,acicular martensiteα′phase and two-phase structure consisting of lathαphase and intercrystallineβphase.The WM is mainly composed of a large number of acicular martensiteα′phases and a small number ofαphases distributed at the originalβgrain boundary.In the fully an‐nealed state,the overall organization of the joint is more uniform and higher spheroidization ofαphase,stronger tensile strength and weaker impact resistance,compared with the stress relieved annealed state.

关 键 词：TC4钛合金 电子束焊接 消除应力退火 热处理 

分 类 号：TG407[金属学及工艺—焊接]