The fracture of the rail in the process of hot forging is analyzed.The microstructure,chemicalcomposition and nonmetallic inclusions of the fracture and the longitudinal section near the fracture are examined and analyzed.The test re-sults show that the chemical composition and non-metallic inclusions of the rail meet the standard requirements.The defect site has the morphology of abnormal coarse structure,rock sugar fracture,and there are grain boundary melting holes near the defect site,which are typical of over burning.Comprehensive analysis shows that the fracture of the rail is caused by o-ver burning during hot forging and thermal processing.
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