Open AccessIncreasing Service Life of a Railway Wheel with Surface Hardening Technology
Author(s) -
T. G. Bunkova
Publication year - 2021
Publication title -
mir transporta
Language(s) - English
Resource type - Journals
ISSN - 1992-3252
DOI - 10.30932/1992-3252-2021-19-1-48-59
Subject(s) - materials science , metallurgy , hardening (computing) , service life , vickers hardness test , indentation , hardness , indentation hardness , alloy , aluminium , composite material , microstructure , layer (electronics)
The article presents surface hardening technology as applied to solid-rolled wheels of rolling stock. The obtained results of the theoretical study on the process of strengthening the metal of the wheel will make it possible to develop scientifically grounded technological and technical solutions to prevent formation and development of defects on the rolling surface, as well as to eliminate them during maintenance. The objective of this work is to identify the optimal method for surface hardening of a railway wheel with defects. At present, the issue of extending service life of elements and critical parts of rolling stock is becoming increasingly acute. Due to the limited economic feasibility and limited availability of existing production technologies, it becomes necessary to create a new material modified with nanoclusters and hardened with surfactants. Nanoclusters have high plasticity and hardness values. To determine the hardness value of nanomaterials, the Vickers hardness test method is used, in which hardness is determined by the size of the area of the indentation after removing the load from the pyramid shaped diamond. Superplasticity is observed in nanostructures. For nickel and nickel-aluminium alloy NiAl 3 , low-temperature superplasticity is observed in the temperature range 450–470°C, which is three times lower than their melting point.