Cause analysis of longitudinal strip spalling damage of metro rail tread
The spalling damages occurred at the rail tread of a metro line after 2 years.The damage features of the rail in early stage,the macroscopic morphology,the metallographic structure and the microhardness of the damaged rail were tested.The chemical composition and the mechanical properties of the rail were inspected.The results showed that the longitudinal spalling damage of the rail was caused by the surface scratch by wheels.The surface structure of the scratched rail was transformed into martensite which was hard and brittle,and then the spalling damages occurred under the repeated contact stresses.The rail damage of the depth less than 0.5 mm could be handled by grinding and milling.If the scratch depth was more than 0.5 mm,the rail should be replaced.
NETL
NSTL
万方数据
维普
