(天津大学 材料科学与工程学院， 天津 300072)
摘 要: 利用自行研制的HJ-II型超声冲击装置， 研究了超声冲击处理对BT20钛合金焊接接头的疲劳性能的影响， 并对TIG焊与电子束焊接接头的焊态及冲击处理态进行了对比疲劳试验。 结果表明： 超声冲击处理使BT20钛合金TIG焊接接头（拉伸载荷）的疲劳强度提高了27%， 寿命延长了3~10倍； 而电子束焊接接头的疲劳强度提高了38%， 寿命延长了29~40倍。
关键字: 钛合金; 疲劳性能; 电子束焊; 超声冲击; TIG焊
ultrasonic peening method
（College of Materials Science and Engineering,
Tianjin University, Tianjin 300072, China）
Abstract:The fatigue property improvement of welded joints for titanium alloy treated by ultrasonic peening was studied. The contrast test between Tungsten inert gas(TIG) welding and electronic beam welding joints treated by ultrasonic peening was conducted. The results show that, as contrasted with the specimens under as welded condition, the fatigue strength of the TIG welding BT20 titanium alloy specimens treated by ultrasonic peening is increased by about 27%, and the fatigue life is prolonged by 3～10 times; as contrasted with the specimens in as welded condition, the fatigue strength of the electronic beam welding BT20 titanium alloy specimens treated by ultrasonic peening is increased by about 38%, and the fatigue life is prolonged by 29～40 times.
Key words: titanium alloy; fatigue properties; electronic beam welding; ultrasonic peening; TIG welding
