轧制与退火对T9S钛合金板材组织与性能的影响

Effects of rolling and annealing on microstructure and properties of T9S titanium alloy sheet

研究了轧制变形量及退火温度对T9S钛合金板材显微组织和室温力学性能的影响。结果表明:增加成品轧制变形量,板材组织破碎更充分,退火后形成等轴α相、拉长α相和晶间β相组织形貌,变形流线比较明显,板材室温强度和硬度升高,伸长率降低,弹性模量增加。随着退火温度升高,板材室温强度和硬度逐渐降低,伸长率逐渐提高,横向弹性模量逐渐减小,纵向弹性模量先增加后减小。经(750~790)℃×45 min空冷退火处理后的板材可以获得较好的强度和塑性的匹配。

Effects of rolling deformation and annealing temperature on microstructure and mechanical properties of T9 S titanium alloy sheet were studied.The results show that with the increase of rolling deformation of finished products,the microstructure of the sheet is finer,and the equiaxedαphase,the elongatedαphase and boundary β phase are formed after annealing,but the deformation flow line is obvious,meanwhile,the room temperature strength and hardness of the sheet increase,the elongation decreases,and the elastic modulus increases.With the increase of annealing temperature,the room temperature strength and hardness of the sheet gradually decrease,the elongation gradually increases,the transverse elastic modulus decreases,and the longitudinal elastic modulus first increases and then decreases.After annealing at 750-790℃ for 45 min with air cooling,the sheet can obtain a better match between strength and plasticity.