摘要
利用Zwick/Roell Z100电子万能材料试验机,在温度为400～800℃、应变速率为0.01～0.2/s的条件下,对高速铁路用铜镁合金接触线材料CuMg0.3、CuMg0.4的热变形行为进行研究。结果表明,随着变形温度的升高,镁铜的延伸率升高,变形抗力降低;随着应变速率的提高,镁铜的变形抗力和延伸率增大。结合高温拉伸下材料的应力应变曲线,参照Zener-Hollomon参数,构建镁铜的稳态流变应力模型和热变形方程,并将试验结果和构建的本构方程输入DEFORM-3D软件进行了接触线材料连续挤压过程的模拟。数值模拟结果和实验结果吻合较好,验证了模型的正确可靠性,为成形时所需的最大载荷及设备选择提供依据,也为数值模拟和产业化生产提供参考。
The hot deformation behavior of copper magnesium contact wire material CuMg0.3, CuMg0.4 for high-speed railway was studied with electronic tensile strength tester Zwick/Roell Z100, at the temperature of 400 - 800℃ and strain rate of 0.01 - 0.2/s. Results show that increasing temperature could improve the elongation and reduce the deformation resistance; Increasing strain rate could improve the elongation and the deformation resistance during hot deformation. Also the relationship between the stress with the deformed temperature and strain rate were calculated. Based on the Zener-Hollomon parameter, the steady flow stress model and hot deformation equation of copper magnesium material were proposed. According these, the simulation of continuous extrusion process for copper magnesium contact wire material has been done in the finite element software DEFORM-3D. Results of simulation are in good agreement with those of experiments. All these provide reference for the manufacturing process of hot forming.
出处
《上海有色金属》
CAS
2012年第4期162-168,共7页
Shanghai Nonferrous Metals
关键词
高速铁路
接触线
铜镁
高温拉伸
热变形方程
数值模拟
high-speed railway
contact wire
copper magnesium alloy
high temperature tensile test
hot deformation equation
numerical simulation
