Steel rail has 3 rail base defects: bottom defect,scab and bottom crack. Thespecimens taken from 20 ×50kg/m U71Mn steel rails with base defect have been analyzed bymacroscopic test, fracture test, metallograpical test, scanning electron microscope energyspectrum analysis ; a detailed description of the macroscopic and microscopic characteristics ofbase defect has been given; the arising rule and the forming cause of rail defect have beenfound out. Conducting industrial comparative test, it is found out that...
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