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1
Content available Transformation of structure during friction stir welding
Vakulenko Igor Alex, Plitchenko Sergey, Kurt Bulent, Proydak Svetlana, Askerov Hangardas
Zeszyty Naukowe. Transport / Politechnika Śląska
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2021
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z. 111
181--191
EN
In comparison with low carbon steels, there is increased interest in the use of aluminium-based alloys as materials for the manufacture of welded structures rolling stock of railway transport. During friction stir welding aluminium-based alloy, against the background of the analysis structural transformations, issues of development hardening processes are considered. Under conditions of existence, a temperature gradient at zone of weld formation, shown degree approximation alloy to the conditions of superplastic flow and influence from presence particles of the second phase on grain size of matrix is estimated. Evaluation of the separate influence grain size of matrix and state of solid solution at total hardness of the weld showed dependence of their contributions on temperature of hot plastic deformation. As the temperature of plastic deformation of alloy at area of the weld increases, contribution to the total hardness from grain size increase and on state of the solid solution decreases.
2
Content available Influence of plastic deformation carbon steel on the process of burning electric arc
Vakulenko Igor Alex, Plitchenko Sergey, Kurt Bulent, Askerov Hangardas, Proydak Svetlana, Erdogdu Ahmet Emrah
Zeszyty Naukowe. Transport / Politechnika Śląska
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2021
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z. 112
211--218
EN
During a study of the combustion process of a direct polarity electric arc, a directly proportional dependence of the electric current value on the degree of cold plastic deformation of carbon steel used as an electrode was found. To calculate the value of the electric current during arc burning, in the indicated ratio, it was proposed to replace the surface tension force of the liquid metal with the surface tension of ferrite of plastically deformed carbon steel. Calculation of the ferrite’s surface tension value on the deformation degree of the steel under study through the size of the coherent scattering regions was used to explain the observed dependence of the electric current during arc burning. From the analysis of the considered correlation ratios, it was found that with an increase in the cold deformation degree, the refinement of the coherent scattering regions results in the ferrite’s surface tension increase and consequently, to an increase in the electric current during arc burning. Comparative analysis of the obtained results of calculating the value of electric current during arc burning through the surface tension of ferrite of cold-deformed carbon steel showed a fairly good coincidence with experimental data. The differences did not exceed 9%.
3
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.
4
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.
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