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Content available Structure and properties of the steel railway wheel disc after forced cooling
Vakulenko I., Grischenko N., Vakulenko L., Efremenko V., Proiydak S., Perkov O.
Zeszyty Naukowe. Transport / Politechnika Śląska
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2018
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z. 98
173--180
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.
2
Content available Investigation of slide mechanism of tread during operation of railway wheel
Vakulenko I., Proidak S., Perkov O.
Zeszyty Naukowe. Transport / Politechnika Śląska
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2016
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z. 90
185--194
EN
Causes of reasons and explanation of mechanism forming damages of railway wheels tread were investigated. At slipping on contact surfaces wheelrail a between by simultaneous development of processes of work-hardening and softening metal determines the terms of origin damages of railway wheels tread were fixed.
3
Content available Influence of hot-reduction parameters on the steel austenite structure of a railway wheel
Vakulenko I., Bolotova D., Perkov O., Lisniak A.
Zeszyty Naukowe. Transport / Politechnika Śląska
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2016
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z. 93
141--148
EN
The formation of grain structures with boundaries similar to substructures is one of the factors contributing to grain refinement in hot-reduction carbon steel. At the forming of a rim, the slight cooling-down (100-150°С) of the surface volumes is sufficient to increase their strength characteristics. After that, an increase in the magnitude of the hot-hardening of metal in the central rim volumes will lead to the formation of a more uniform fine-grain austenite structure over the rim section.
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