变形量及热处理对高标纯钛管材组织与性能的影响

Effect of Deformation and Heat Treatment on Microstructure and Mechanical Properties of High-specification Pure Titanium Tube

对高标Gr．2（TA2）纯钛管材冷加工变形量及热处理温度对室温力学性能及显微组织的影响进行分析。结果表明：冷加工变形量为48％时，经500℃热处理，局部出现少量等轴晶，90％以上为加工态组织；经550℃热处理。可获得晶粒尺寸小于5μm的细小等轴晶；冷加工变形量达到60％时，经500℃热处理，可获得晶粒尺寸小于5μm的细小等轴晶；当冷加工变形量为48％、热处理温度选择550～600℃，冷加工变形量为60％、热处理温度选择500～600℃．可获得满意的力学性能及显微组织。

The effects of deformation and heat treatment on microstructure and mechanical properties of high-specification pure titanium Crr.2 （TA2） tube were analyzed. Results show that under the deformation of 48% and the cold working after annealing at 500℃, the microstructure is equal axis crystal and the grain size is less than 5 Ixm after annealing at 550 ℃, the longitudinal microstructure of the deformation of 60% is equal axis crystal and the grain size is less than 5 μm after annealing at 500 ℃. The proper heat treatment temperature is 500-600 ℃ with the deformation of 60%, and the deformation of 48%, choosing 500-600 ℃ heat treatment can obtain better mechanical properties and microstructure.