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A B S T R A C T A new surface induction hardening technology was designed for the purpose of increasing the resistance of railway wheelsets to fatigue damage. This paper gives a detailed presentation of the technological aspects of induction hardening of axles. The increased fatigue resistance in hardened surfaces compared with standard heat treatment of EA4T steel was verified using tensile test specimens, press-fitted wheel seat/axle joints at 1:3 scale and press-fitted wheel/axle joints at actual size. The 70% increase in the fatigue limit of induction hardened EA4T steel specimens compared with material subjected to standard heat treatment clearly demonstrates the effectiveness of this technology.A = parameter A 5 = ductility B = parameter C = parameter d = axle body diameter D = wheel seat diameter f = loading frequency f i = frequency HV30 = hardness i = test level M = bending moment q = notch sensitivity parameter R = aspect ratio R e = yield strength R fL = fatigue limit for the smooth specimen R fE = fatigue limit for notched specimen R m = tensile strength R 0 = the lowest level of stress ŝ = standard deviation W o = modulus of resistance of the test specimen section δ = difference in stress between neighbouring test levels Δ = parameter depending on A, B, C ε_ = strain rate I N T R O D U C T I O NDemands for higher reliability and safety of railway vehicles have brought intensive research of degradation processes in railway wheelsets 1-3 and new approaches to wheelset design. 4 Extremely high repeated contact stresses between wheels and rails cause rolling contact fatigue. 1,2 A very serious form of damage to wheel seats is fretting fatigue, caused by small-amplitude oscillatory movement of wheels in press-fitted seat/axle joints. 3

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Abstract:The main aim of the presented paper is to show how heat treatment, in our case the induction hardening, will affect the wear rates as well as the ratcheting evolution process beneath the contact surface in the field of line rolling contact. Used wear model is based on shear band cracking mechanism [1] and non-linear kinematic and isotropic hardening rule of Chaboche and Lemaitre. The entire numerical simulations have been realized in the C# programming language. Results from numerical simulations are subsequently compared with experimental data.

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