Browsing by Author "Grischenko, Nikolaji"
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Item Insights into Factors of Damage of Surface Rolling of Railway Wheels During Operation(The Silesian University of Technology, 2019) Askerov, Hangardas; Vakulenko, Igor A.; Grischenko, NikolajiEN: The systematization results of microstructure studies of carbon steel has made it possible to explain the mechanism of formation of certain damages to the rolling surface of railway wheels during operation. The evaluation ability of metal to strain hardening was used to explain the nature of the influence compactly located non-deformable dispersed particles on the strength properties steel during cold plastic deformation. In the process of the interaction of a railway wheel with a rail, successively occurring heterogeneities in the distribution of the plastic flow metal are one of the main reasons for the formation of defects on the rolling surface of the wheel.Item Structure and Properties of the Steel Railway Wheel Disc After Forced Cooling(The Faculty of Transport The Silesian University of Technology, Katowice, Poland, 2018) Vakulenko, Igor A.; Grischenko, Nikolaji; Vakulenko, Leonid I.; Efremenko, Vasily G.; Proiydak, Svetlana V.; Perkov, Oleg N.EN: The technological use of accelerated cooling makes it possible to improve the carbon steel properties of the all-rolled railway wheel disc. The properties’ complex depends on the temperature of the accelerated cooling termination. This is determined by the ratio of the carbon atoms emitted from the supersaturated solid solution to the crystal structure defects and dispersion strengthening from carbide phase particles. If the cooling stops at a temperature above 350°C, the decline rate of the strength properties increases. This is caused by the excessive softening effect of the solid solution breakdown and cementite spheroidization during the processes of dispersion hardening.