高速铁路Cu-Cr-Zr合金承导线对连续挤压工艺的适应性

Adaptability Research on Cu-Cr-Zr Alloy for High Speed Railway Overhead Contact Lines During Continuous Extrusion Process

为研究高速铁路承导线Cu-Cr-Zr合金对连续挤压工艺的适应性,采用TLJ500连续挤压机对满足高速铁路承导线用Cu-Cr-Zr合金元素含量要求的上引连铸杆坯进行了连续挤压加工,结合三维有限元数值模拟分析结果,分析了该Cu-Cr-Zr合金连续挤压杆的显微组织特征。基于Arrhenius双曲正弦函数和Cu-Cr-Zr合金的高温热模拟变形试验结果构建了高速铁路承导线用Cu-Cr-Zr合金的本构方程,并以此为基础利用UG、Deform 3D等软件平台建立了该合金在同等现实连续挤压工艺条件下的有限元分析模型,模拟了该合金在加工过程中所形成的温度场、应变场等物理场的分布状态。通过观察分析Cu-Cr-Zr合金挤压杆微观组织形貌和第二析出相的分布状态,认为Cu-Cr-Zr合金经连续挤压工艺加工后,其显微组织结构得到了显著的改善,增强了细晶强化作用和第二相粒子的析出强化作用,过饱和固溶体分解析出的第二相粒子不仅阻碍了亚晶晶界向大角度晶界转变的趋势,而且还有利于抑制合金在连续挤压过程中再结晶晶粒的长大。

In order to study the adaptability of continuous extrusion process for Cu-Cr-Zr alloy which was satisfied the content requirements of high-speed railway overhead contact lines,this alloy was processed with the TLJ500 continuous extrusion machine,and the microstructure of Cu-Cr-Zr alloy continuous extrusion rod was analyzed combine with the results of three-dimensional finite element numerical simulation.The constitutive equation of Cu-Cr-Zr alloy used for high-speed railway overhead contact lines was established on Arrhhenius hyperbolic sinusoidal function with the experimental results of high temperature thermal deformation simulation of this alloy.And the three-dimensional finite element analysis model of the Cu-Cr-Zr alloy was built up though the software platforms of UG and Deform 3D,the temperature field distribution and strain field distribution of its processing processes were simulated as well.The distributions of the second phase and microstructure of the Cu-Cr-Zr alloy extrusion rod were observed by,it was considered that the microstructure was obviously improved though continuous extrusion process combined with simulation results of physical field such as temperature field,strain field from the point of structure analysis views.Not only the fine-grained strengthening effects were enhanced and the second phase particles precipitation strengthening effects were improved,but also the growth of recrystallized grain was restrained during the Cu-Cr-Zr alloy continuous extrusion processing processes.