Optimization of chemical composition of steel for railroad wheels providing stabilization of mechanical and increase of operational properties
Journal Title: Metallurgical and Mining Industry - Year 2017, Vol 9, Issue 3
Abstract
In connection with the increase in axle loads of freight cars on the railways and the increase of their speed of movement, the requirements to the service and operational properties of railway wheels, including wear resistance and thermal resistance, are significantly increasing. One of the main factors affecting these indicators is the chemical composition of steel for railway wheels. To determine the influence of chemical elements on the service properties of railway wheels, composition of steel was structured as a chemically unified system, which was carried out on the basis of factor and physic-chemical analyzes with separation of elements into subsystems: matrix, alloying, microalloying and impurity. In this method, the influence of each of the subsystems is considered comprehensively through the physic-chemical parameters of the “convolution” of the chemical composition of each of them, which reduces the parametric of the forecast models, increases their information capacity and allows obtaining adequate and stable models according to scheme “chemical composition - microstructure - mechanical properties of steels for railway wheels”. On the basis of computational and laboratory experiments, the “restricted” limits and the proportions of the elemental composition are proved, which ensure the required mechanical properties and increase the resistance to thermal effects arising from the operation of railway wheels during braking were justified. The influence of vanadium as one of the effective micro-alloying elements, which have a positive effect on the strength properties of railway wheels has been established.
Authors and Affiliations
A. I. Babachenko, D. N. Togobitskaya, A. S. Kozachyok, A. A. Kononenko, A. V. Knysh, I. R. Snigur
Keywords
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