Abstract
Plasma selective quenching (PSQ) forms dispersed hardening microscopic structures on the rail material surface by the action of energetic plasma. In this study, the microstructure and tribological properties of PSQ treated rail materials are investigated by the rolling fatigue test and metallographic analysis. The effect of plasma parameters on the surface quality and microstructure is analyzed, and the optimum diameter of PSQ region is 5.0 mm. The microhardness in the PSQ region significantly increased and the tribological properties of rail materials improved. Meanwhile, severe spalling occurs on the surface in the PSQ region. Based on the field application, the wear resistance of the switch rails is enhanced by approximately 3 times that of untreated rail materials.
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