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This manuscript investigates the impact of microstructure on rolling contact fatigue (RCF) in rail steel, focusing on spheroidized pearlite versus fully pearlitic microstructures. Twin-disc tests reveal that while spheroidized discs exhibit increased surface hardness and reduced cycles to RCF initiation under certain conditions, they show no statistical difference in RCF propagation when tested with 1% slip. The findings contribute to understanding the RCF risks associated with the heat-affected zones in he

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hg9kx4cfmc

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