(天津大學(xué) 材料科學(xué)與工程學(xué)院， 天津 300072)
摘 要: 利用自行研制的HJ-II型超聲沖擊裝置， 研究了超聲沖擊處理對(duì)BT20鈦合金焊接接頭的疲勞性能的影響， 并對(duì)TIG焊與電子束焊接接頭的焊態(tài)及沖擊處理態(tài)進(jìn)行了對(duì)比疲勞試驗(yàn)。 結(jié)果表明： 超聲沖擊處理使BT20鈦合金TIG焊接接頭（拉伸載荷）的疲勞強(qiáng)度提高了27%， 壽命延長(zhǎng)了3~10倍； 而電子束焊接接頭的疲勞強(qiáng)度提高了38%， 壽命延長(zhǎng)了29~40倍。
關(guān)鍵字: 鈦合金; 疲勞性能; 電子束焊; 超聲沖擊; 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
