The railway axle according to this disclosure has a pair of fitting portions and which each include a fitting portion hardened layer and a base metal portion, and a center parallel portion which includes a center parallel portion hardened layer and the base metal portion. The base metal portion has the chemical composition described in the description. In a region having the Vickers hardness of 480 HV or more in the center parallel portion hardened layer, a dislocation density p obtained based on a CoKα characteristic X-ray diffraction result is 2.5×1016 m−2 or less, a half-value width B of the (211) diffraction plane is 1.34 degrees or less, and the dislocation density p and the half-value width B of the (211) plane obtained by X-ray diffraction satisfy Formula (1).(−4.8×1016×B+8.5×1016)/ρ≥1.00 (1)
RAILWAY AXLE
2023-08-31
Patent
Elektronische Ressource
Englisch