Effect of different annealing processes on the bending property of the welded joint of TA15 titanium alloy plate was studied.Through microstructure analysis,the microstructure transformation process of the welded joint with the change of heating temperature and holding time was explored.The effect of microstructure change on the bending property of welded joints through ultimate bending tests was verified,and ultimately the optimal annealing process was determined.The results indicate that the welded joint of the TA15 titanium alloy plate exhibits a typical columnar grain structure with needle-like α phases are distributed in different directions,and the welded joint has poor plasticity and poor bending property.Using general post weld stabilization annealing treatment(750 ℃ ×90 min and 750 ℃ × 120 min)can alleviate the welding stress,but with no significant improvement in microstructure and properties of the welded joint,which fails to effectively enhance the bending property.After annealing at 850 ℃ for 120 min with furnace cooling,the microstructure of welded joint is significantly improved,and at the same time,the bending property is improved.
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