摘要
青藏铁路的开通使得钢轨钢材在低温环境下的使用愈发广泛起来,其在低温下断裂性能的研究工作重要性也随之凸现。通过对青藏铁路常用的两种钢轨钢材类型U71Mn和U75V制作三点弯曲试样在20、0、-20、-40℃以及-60℃情况下进行试验,并利用断裂力学理论,计算得到了这两种钢轨钢材在不同温度下的裂纹张开位移CTOD与J积分值,并对这两种钢轨钢材在低温下的断裂性能进行了系统总结和分析。对低温条件下钢轨的相关设计人员提供了一定的借鉴作用。
Rail steel under low temperature condition become more widely used with the construction of Qinghai - Tibet Railway. It＇ s necessary to make research on their fracture properties. Two typical rail steel materials U71Mn and U75V in Qinghai - Tibet Railway were given by three - point bending test under the temperature of 20℃, 0℃, - 20℃, - 40℃ and - 60℃ to obtain CTOD and J integral values. Analysis and discussion have been made on the influence of temperature value and chemical composition of rail steel on fracture property. Some suggestions have been proposed finally.
出处
《低温建筑技术》
2007年第3期29-32,共4页
Low Temperature Architecture Technology
基金
铁道部-清华大学科学研究基金项目(T2000410)
国家自然科学基金项目(50078029)
关键词
钢轨钢材
低温
CTOD
J积分
rail steel material
low temperature
CTOD
J integral
