The formation of large rolling scars on the rail web was analyzed.Metallographic test was carried out on typical defect samples.The results showed that the rolled-in metallic body was separated from the matrix at the scar location,no oxide particles were found on both sides of the crack,and the rolled-in metallic body was seriously decarburized.Energy spectrum analysis showed that the components of the rolled-in metallic body and the matrix were the same.The rolled-in metallic bodyis was the adhesive steel scratched by the roller or other auxiliary equipment from the end of the rail,which failed on the steel and was rolled in the matrix in subsequent rolling process.
railrolling scardecarburizationrolled-in metallic body
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