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。
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 1s^-1. The influence of processing parameters on the flow stress and the microstructure was studied. The strain rate sensitivity rn 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 rn increases with the increase of deformation temperature. The deformation activation energy Q is 386. 320kJ/mol at 650-850℃ and 479. 365kJ/mol at 850-1 000℃, which means the two temperature ranges correspond to different deformation mechanism.
出处
《机械工程材料》
CAS
CSCD
北大核心
2006年第11期63-65,98,共4页
Materials For Mechanical Engineering
关键词
TA15合金
热变形
变形激活能
本构方程
TA15 alloy
thermal deformation
deformation activation energy
constitutive equation
