摘要
采用Gleeble-3800热模拟机对一种纯钛TA1进行了等温等应变速率热压缩试验,变形温度范围为650~850℃,应变速率范围为1~20 s^(-1),变形量为60%。研究结果表明:纯钛的流变应力随变形温度升高而降低,随应变速率升高而升高;采用Arrhenius本构模型构建了纯钛的本构方程,该方程可为纯钛热加工的数值模拟提供模型参考;根据动态材料模型构建了纯钛的热加工图,并通过纯钛的显微组织对热加工图进行了验证,结果表明纯钛热加工图的预测与组织演变规律一致。研究结果为纯钛热加工工艺的制定和优化提供了理论依据。
The isothermal and iso-strain rate hot deformation for pure titanium TA1 was tested on Gleeble-3800 thermal simulator at 650 ~ 850 ℃ with strain rates of 1 ~ 20 s^（-1） and deformation degree of 60%.The results show that the flow stress of the pure titanium decreases with increase in deforming temperature while increases with strain rate increasing. The constitutive equation of pure titanium was constructed by Arrhenius constitutive model,which can be used as the reference model for the numerical simulation of hot processing of pure titanium. The hot processing map for pure titanium was established according to the dynamic materials model,which is consistent with the experimental observations for the microstructure evolvement of pure titanium. The obtained results in this paper can provide technical base for establishing and optimizing of hot processing of pure titanium.
出处
《钢铁钒钛》
CAS
北大核心
2016年第2期37-43,共7页
Iron Steel Vanadium Titanium
关键词
纯钛
高应变速率
本构方程
加工图
显微组织
pure titanium
high strain rate
constitutive equation
processing map
microstructure
