TC1钛合金的高温流变行为

Flow Behavior of TC1 Titanium Alloy at High Temperature

通过试验研究了TC1钛合金在变形温度为650~750℃、应变速率为0.000 5~0.01s^-1条件下拉伸时的流变应力及组织演变规律;利用改进的Hooke定律和Grosman方程建立了TC1钛合金在高温下的应力-应变本构模型。结果表明：在应变速率一定时,TC1钛合金的流变应力随温度升高快速下降,当温度达到700℃并继续升高时,流变应力下降减缓;当变形温度一定时,流变应力随应变速率的增加而快速增大;TC1钛合金在700℃变形时,低的应变速率可以促进动态再结晶的发生;依据拉伸试验数据建立的本构方程能够较准确地反映TC1钛合金在高温下的流变行为。

Flow stress and microstructure evoluation of TC1 titanium alloy at high temperatures ranging from 650 ℃ to 750 ℃,and strain rates from 0.000 5 s^-1 to 0.01 s^-1 through tensile test.Constitute equation at high temeperature were obtained based on the revised Hooke law and Grosman equations.The results show that the flow stress decreased rapidly at first with the increase of temperature,and then decreased slowly when temperature up to 700 ℃ at constant strains rate.When deformation temperature was constant,flow stress increased with the increase of strain rate.When TC1 titanium alloy deformed at 700 ℃,low strain rate could contribute to the occurrence of dynamic recrystallization.The constitutive equation obtained according to experimental data could accurately reflect the flow behavior of TC1 titanium alloy at high temperature.