Machines. Technologies. Materials.
Vol. 19 (2025), Issue 8, pg(s) 285-288

TECHNOLOGIES

Formation of defects in railway wheel rims during operation

  • 1 Iron and Steel Institute of National Academy of Science of Ukraine
  • 2 Ukrainian State University of Science and Technologies: Prydniprovska State Academy of Civil Engineering and Architecture Dnepr, Ukraine

Abstract

During operation, under the influence of mechanical stress, temperature, and external environment, the initial structure of a railway wheel undergoes changes that lead to its fatigue-corrosion wear.
The wheels with different tread profiles that were removed from operation due to the maximum wear of the rims were studied. The studies were carried out using the metallographic method (Neophot-21) and scanning electron microscope JSM-35.
The causes of cracks and wear particles formation near the tread surface of railway wheels associated with phase and structural changes occurring during operation were analyzed. The possibilities of changing the tread profile due to uneven wear were established. It was shown that structural and phase changes near the tread surface are associated with the development of plastic shifts due to the action of external loads, thermal stresses during braking, and the formation of “white layers” when the metal is heated by the heat of braking and abrupt cooling when the brakes are turned off. The role of non-metallic inclusions and corrosion products of wheel steel in the formation of cracks near tread of railway wheels has been established.

Keywords

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