钢轨踏面掉块原因分析  

Reason Analysis of Peeling on Rail Tread

作　　者：吴雄先[1] 邓建辉[1] 王飞龙[1] 

机构地区：[1]攀枝花钢铁研究院,攀枝花617000

出　　处：《理化检验（物理分册）》2009年第1期39-41,共3页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：U71Mn(60 kg/m)钢轨铺设在主干线与车站进出口联接处使用50多d(天)后出现踏面掉块。采用化学成分分析、宏观和微观检验等方法分析其掉块原因。结果表明:列车高速运行时突遇偶发事故而采用紧急制动措施,强大的制动力造成列车车轮与钢轨踏面之间的摩擦致使该区域突然升温而后又降温,进而发生相变生成马氏体并形成裂纹。随后在车轮的反复碾压作用下最终造成钢轨踏面掉块。The U71Mn rail, whose type was 60 kg/m, had been laid in the joint of main line and the station port for more than 50 days and peeled on the rail tread. The reason was analyzed by means of chemical composition analysis, maerostructure and mierostructure examination etc. The results showed that, when the train ran rapidly, suddenly the contingency happened, the driver adopted the emergency brake scheme to avoiding danger, then the powerful brake force had caused the wheel and the rail to contact abruptly and closely, at the same time, the large friction was generated to cause the crack, and the phase change to generate the martersite was happened in rail tread by high temperature. The crack and martersite had been roiled repeatedly by wheel, finally, the peeling happened on the rail tread.

关 键 词：钢轨 踏面掉块 马氏体 裂纹 

分 类 号：U213.42[交通运输工程—道路与铁道工程]