摘要
为研究高速铁路承导线用Cu-Cr-Zr合金连续挤压加工的塑性变形行为,采用T L J500连续挤压机对上引连铸杆坯进行连续挤压加工,结合三维有限元数值模拟分析结果,绘制塑性加工工艺图,分析加工工艺参数。基于Arrhenius双曲正弦函数和高温热模拟变形试验结果构建Cu-Cr-Zr的本构方程,并建立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,模拟该合金在加工过程中所形成的温度场、应力场等物理场的分布状态。通过分析合金动态DSC分析结果曲线图和塑性加工工艺图,并结合Cu-Cr-Zi合金的热变形本构方程,得出Cu-Cr-Zi合金热激活过程所需的热激活能为380.52 kJ/mol;在热塑性加工时,失稳区主要分布在450-530℃、应变速率小于0.8s^-1的范围内;而最佳热塑性加工的温度范围是725~780℃,应变速率小于0.04 S^-1。
In order to study the plastic deformation behavior of continuous extrusion processing of Cu-Cr-Zr alloy for highspeed railway conductor,TLJ500 continuous extruder was used to process the upstream continuous casting rod billet.Combined with the results of three-dimensional finite element numerical simulation analysis,the plastic processing technology chart was drawn and the processing parameters were analyzed.Based on Arrhenius hyperbolic sinusoidal function and high temperature thermal simulation deformation test results,the constitutive equation of Cu-Cr-Zr was constructed,and the finite element analysis model of the alloy under the same conditions of continuous extrusion was established to simulate the distribution of temperature field,stress field and other physical fields during the processing of the alloy.By analyzing the dynamic DSC analysis results and the plastic working process diagram of the alloy,and combining with the thermal deformation constitutive equation of the Cu-Cr-Zr alloy,the thermal activation energy required for the thermal activation process of the alloy is 380.52 kJ/mol,and the instability zone mainly distributes in the range of 450〜530℃and the strain rate is less than 0.8 s^-1 during the thermoplastic processing.The optimum temperature range for thermoplastic processing is 725〜780℃,and the strain rate is less than 0.04 s^-1.
作者
李文友
Li Wenyou(China Railway Construction Electrification Bureau Group Co.Ltd.,Beijing 100043,China)
出处
《铁道建筑技术》
2019年第12期40-46,共7页
Railway Construction Technology
基金
中国铁建电气化局集团有限公司科技研发项目(2016-100)
