Ti-6Al-2Zr-1Mo-1V合金高温变形流动应力预测模型

通过高温压缩模拟实验,分析了Ti-6Al-2Zr-1Mo-1V合金在变形温度为850～1100℃,应变速率为0.01～10 s-1条件下的高温变形力学行为规律,并利用线性回归方法计算了不同温度范围内的应力指数n和变形激活能Q,获得了该合金高温变形力学行为计算模型.结果表明,Ti-6Al-2Zr-1Mo-1V合金对变形温度和应变速率非常敏感.在恒温时流动应力随应变速率的增大而增大,在恒应变速率时随变形温度的升高而降低.在850～950℃时,n、Q分别为7.0874和610.463 kJ/mol;而在950～1100℃时,n=4.7324,Q=238.030 kJ/mol,该预测模型的计算值与实测值之间的相对误差分别为6.341%和6.957%.

Flow Stress Predictive Model for Ti-6Al-2Zr-1Mo-1V Alloy Under High Temperature Deformation

Based on high-temperature compression simulation experiments of Ti-6A1-2Zr-1Mo-1V alloy,its mechanieal behavior law was analyzed under the conditions of deformation temperature at 850～1100 ℃,strain rate of 0.01～10 s-1.The flow stress predictive models for Ti-6A1-2Zr-1Mo-1V alloys could be obtained by the calculation of stress index n and deformation activation energy Q using linear regression method.The results show that the flow stress of Ti-6A1-2Zr-1Mo-1V alloys is very sensitive to the deformation temperature and strain rate.The flow stress increases with the increase of strain rate at the constant temperature,but reduces with the increase of temperature at the constant strain rate.At 850～950 ℃,stress index n and deformation activation energy Q is respectively 7.0874 and 610.463 kJ/mol.But at 950～1100 ℃,n=4.7324,Q=238.030 kJ/mol.The relative error between the calculation and experimental value is respectively 6.341% and6.957%.