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1
Content available Influence hot plastic deformation on the structure and properties of carbon steel of the railway wheel
Vakulenko Igor, Plitchenko Sergey, Bolotova Dariy, Asgarov Khangardash
Zeszyty Naukowe. Transport / Politechnika Śląska
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2023
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z. 121
257--266
EN
The study is devoted to the explanation of the influence of hot plastic deformation on the properties of railway wheels. The shape of individual elements of the wheel provides for a different degree of hot compression, which determines the mechanism for the development of the recrystallization at austenite. With a decrease in the degree of the hot deformation, a certain proportion of grains with a low energy of linear stretching are formed in austenite. As a result, of the low mobility of such boundaries, the likelihood of preservation of part of the substructural state of the austenite increases, which should affect the formation of a colony of perlite during the cooling of the carbon steel. Against background preservation and a dependence of strength properties on the dispersion of the pearlite colony, the appearance in austenite of grain boundaries with a low energy of linear tension leads to a qualitative change in the plastic properties of railway wheel steel. The increase in plasticity of carbon steel with an increase in dispersion of the pearlite colony is due to a decrease in the effect of solid solution hardening and an increase in the role of the ferrite-cementite interface in the development processes of strain hardening carbon steel. The results obtained can be useful for improving the technology of manufacturing all-rolled railway wheels.
2
Content available The calculation of stress intensity factor steel of railway wheels
Vakulenko Igor, Proydak Svetlana, Askerov Hangardas
Zeszyty Naukowe. Transport / Politechnika Śląska
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2020
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z. 109
187--193
EN
From an analysis of the dependence complex of carbon steel properties on structural parameters, it was found that for an isostructural state, the influence of austenite grain size on impact strength exceeds the dependence on carbon content. As a result of explaining correlation relationships between individual mechanical characteristics, to evaluate critical stress intensity factor, a relationship is proposed based on the use of impact strength. The proportionality coefficient in proposed dependence is determined by ratio of elongation to narrowing at tensile test.
3
Content available The influence of nonmetallic inclusion on strain hardening carbon steel
Vakulenko Igor, Vakulenko Leonid, Proydak Svetlana
Zeszyty Naukowe. Transport / Politechnika Śląska
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2019
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z. 103
193--198
EN
On a fragment of the rim of a railway wheel removed from service, the volume of the metal with non-metallic inclusions located near the tread surface was investigated. The use of the microhardness measurement technique made it possible to establish the nature of strain hardening of carbon steel near non-metallic inclusions. It showed that with a normal orientation of the plastic flow relative to the inclusion surface, the metal volumes undergo hardening. In proportion to the appearance of a fraction of the tangential component of the deformation near the nonmetallic inclusion, a decrease in the degree of hardening of the metal was observed.
4
Content available Insights into factors of damage of surface rolling of railway wheels during operation
Aaskerov Hangardas, Vakulenko Igor, Grischenko Nikolaji
Zeszyty Naukowe. Transport / Politechnika Śląska
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2019
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z. 105
27--33
EN
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.
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