Abstract
Laminar Plasma Quenching Tempering (LPQT) is an innovative surface treatment technique for rails, which effectively enhances both their fatigue resistance and wear resistance. This study examines the crack initiation and propagation mechanisms in LPQT-treated rail materials with distinct quenched zones using double-disc testing and metallographic analysis. The findings indicate that the crack initiation and propagation process in LPQT rails with different quenched zones is characterized by four stages. Moreover, the grain size within the spot-quenched zone of LPQT rails is notably smaller, which results in a reduced resistance to RCF crack propagation. Consequently, the crack propagation in point-quenched LPQT rail material is more intricate, with a more severe damage scenario.
Published Version
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