Abstract： The rails in a highspeed railway was damaged, which mainly showed superficial punctate craquelure chipping. The normal and damaged parts of the rail were analyzed by means of metallographic microscope, scanning electron microscope, backscatter electron diffraction orientation imaging, transmission electron microscope and microhardness tester. The results showed that the fallen pieces of the rail tread were caused by the short time skidding and idling of the wheels during the start of the train, which resulted in the huge friction force on the rail surface and the severe plastic deformation of the surface metal. The temperature rose instantaneously above the austenitizing temperature and then cooled down rapidly. White layer martensite with thickness not more than 1.0 mm was formed on the rail tread. Under the repeated action of wheelrail contact stress, the white layer martensite broke to form craquelure cracks. Then the crack propagated along the interface between the white layer and the matrix, resulting in the superficial peeling of the matrix.
引用本文:
李继康，王春芳，张银花. 高速铁路钢轨表面伤损分析[J]. 物理测试, 2021, 39(4): 18-.
LI Jikang, WANG Chunfang, ZHANG Yinhua. Analysis on surface damage of hot rails for highspeed railway. PHYSICS EXAMINATION AND TESTING, 2021, 39(4): 18-.
2021, Vol. 39 
