TA15合金热变形行为研究

Study on Hot Deformation Behavior of TA15 Alloy

摘要: 用Gleeble-1500型热模拟试验机对TA15合金进行了变形温度为650~1 000 ℃、应变速率为0.001~1s-1的热压缩试验,研究了工艺参数对流变应力及组织的影响,计算了应力速率敏感指数m及变形激活能Q,建立了本构方程.结果表明:流变应力随变形温度升高而降低,随应变速率提高而增大;应力速率敏感指数m随变形温度的升高而增大.650~850 ℃时变形激活能为386.32 kJ/mol,850~1 000 ℃时为479.365 kJ/mol,预示在不同的温度区间具有不同的变形机制.

Abstract: The high temperature compression tests of TA15 alloy were carried on Gleeble-1500 simulator.The temperature is from 650 ℃ to 1 000 ℃.The strain rate is from 0.001 s-1 to 1 s-1.The influence of processing parameters on the flow stress and the microstructure was studied.The strain rate sensitivity m and deformation activation energy Q were calculated.And the constitutive equation was presented.The results show that the flow stress decreases with the increase of temperature,while increases with the increase of strain rate.The value of m increases with the increase of deformation temperature.The deformation activation energy Q is 386.320 kJ/mol at 650-850 ℃ and 479.365 kJ/mol at 850-1 000 ℃,which means the two temperature ranges correspond to different deformation mechanism.