This disclosure provides a railway axle (1) that has fitting portions (2) in which fretting fatigue is suppressed, and a center parallel portion (3) which exhibits excellent fatigue strength. The railway axle (1) according to this disclosure has a pair of fitting portions (2) on which a railway wheel is to be press-fitted and which each include a fitting portion hardened layer (2H) and a base metal portion (BM), and a center parallel portion (3) which is located between the pair of fitting portions (2) and which includes a center parallel portion hardened layer (3H) and the base metal portion (BM). The base metal portion (BM) 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 (3H), a dislocation density ρ 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 ρ 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
RAILWAY AXLE
EISENBAHNACHSE
ESSIEU FERROVIAIRE
2023-11-08
Patent
Elektronische Ressource
Englisch