退火對TC18鈦合金電子束焊接接頭組織與力學性能的影響

退火對TC18鈦合金電子束焊接接頭組織與力學性能的影響Influences of Annealing Treatment on Microstructure and Mechanical Properties of TC18 Titanium Alloy Electron Beam Welded Joint

采用普通退火和去應力退火兩種退火工藝對TC18鈦合金電子束焊接接頭進行焊后熱處理，研究了退火處理對焊接接頭顯微組織、拉伸性能和沖擊性能的影響，并將接頭的性能與母材的進行了對比。結果表明：與去應力退火相比，普通退火后，顯微組織中的α相含量減少，β相含量增多，接頭的強度降低，塑性更高；兩種方式退火后，母材和焊接接頭的拉伸性能相差不大，但母材的沖擊性能優于焊接接頭的。

Firstly, normal annealing and stress relief annealing were carried out on electron beam welded joint of TC18 titanium alloys, and then the effects of annealing treatments on microstructure, tensile and impact properties of the welded joint were studied; the properties of the welded joint were compared with that of the base metal. It is shown that, compared with the stress relief annealing, the content of α phase in the normal annealed joint decreased significantly while the content of β phase increased dramatically. Compared with the stress relief annealing, the strength of the joint adopting normal annealing was lower, while its plasticity was higher. After normal and stress relief annealing treatments, the tensile properties of base metal and welded joint were similar, but the impact property of base metal was better than that of the welded joint.