高寒地区铁路用新型珠光体钢轨研发

Research and Development of New Pearlitic Rail for Railway in Alpine Regions

文章针对高寒地区铁路运营环境和钢轨服役性能需求,通过材料成分设计和热处理工艺研究,在实验室开发出性能优异的新型耐磨耐低温珠光体钢轨。试验结果表明:在化学成分为0.66%C-0.45%Si-1.10%Mn基础上,加入0.10%Ni元素对试验钢-40℃冲击功改善不明显,但冲击性能比不加Ni稳定。试验钢开始热处理温度提高至780℃后,可阻止异常组织马氏体产生,组织为珠光体加少量铁素体,-40℃冲击功可达20.1 J。

In the paper,it is introduced a new type of wear resistant and low temperature resistant pearlitic rail with excellent performances is developed through designing material compositions and studying heat treatment process aiming at the operating environment of railway in alpine regions and performance requirements for service of rail.The test results showed that the improvement of impact energy of test steel at-40℃was not obvious by adding 0.10%Ni on the basis of the chemical composition of 0.66%C-0.45%Si-1.10%Mn,but impact performance was more stable than that of test steel without Ni.After the heat treatment of test steel is started and temperature is increased to 780℃,the abnormal microstructure,martensite could be prevented to be generated as well as microstructure is pearlite and a small amount of ferrite and impact energy at-40℃could reach 20.1 J.