TC10钛合金高温变形行为和组织演变的研究

Investigation on Thermal Deformation Performance and Microstructure Transition of TC10 Titanium Alloy

通过恒应变压缩实验研究了锻态TC10钛合金的高温变形行为和组织演变规律,变形温度为800~920℃,应变速率为0.01~10 s^(-1),变形量为60%。研究结果表明:降低变形温度、提高应变速率,流变应力会在变形初期迅速增加,而显微组织没有明显变化,当流变应力达到最大值后随着动态再结晶的发生而逐渐降低。提高变形温度、降低应变速率,能够为动态再结晶提供能量,细化组织并降低流变应力。综合分析表明:在变形温度为840~900℃,应变速率为0.01~0.1 s^(-1)的参数范围内进行热变形可以获得性能优良的TC10钛合金产品。

Thermal deformation performance and microstructure transition under the constant temperature and the constant strain rate of forged TC10 titanium alloy were investigated. The hot simulator was over the range of deformation temperature from 800 ℃ to 920 ℃, strain rate from 0. 01 s- 1 to 10 s-1, and maximum deformation degree of 60%. The experimental results show that for tests at low temperature and high strain rate, the flow stress increases quickly at the very beginning of the deformation without significant change on microstructure. After the flow stress reaches its maximum value, dynamic recrystallisation occurres at a lamellae accompanied by a decrease of the flow stress, known as strain softening. Raising the deformation temperature or decreasing the strain rate can provide the energy for dynamic recrystallisation, refine grain and reduce the flow stress. Thereafter, optimal process parameters for TC10 titanium alloy products with excellent performance are the temperature of 840 ℃ to 900 ℃ and strain rate of 0. 01 s - 1 to 0. 1 s - 1