operational reliability

Іnfluence of Fatigue Crack Growth Resistance Characteristics of Wheel Steels With Nitride Strengthening on Their Damage Resistance Under Contact Fatigue

The relationship between spalling formation on model wheels tread surface and cyclic fracture toughness of steels with nitride strengthening is study. It is shown that the nitride strengthening of wheel steels has a positive influence on damage resistance of surface rolling of model wheels. To improve the serviceability of wheel steels with nitride strengthening indicated the need to optimize their chemical composition providing content of carbon in the range of 0.50...0.55 %, vanadium — 0.08...0.12 % and nitrogen — 0,008...0,015 %.