Browsing by Author "Plitchenko, Sergey"
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Item Influence of Plastic Deformation Carbon Steel on the Process of Burning lectric ARC(Silesian University of Technology, Poland, 2021) Vakulenko, Igor A.; Plitchenko, Sergey; Kurt, Bulent; Askerov, Hangardas; Proydak, Svetlana V.; Erdogdu, Ahmet EmrahEN: 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%.Item Influence of Substructure Strengthening of Law-Carbon Steel on the Arcing Process(WRTYS, Kyiv, 2017) Vakulenko, Ihor A.; Plitchenko, Sergey; Nadezhdin, Yurii L.; Kirienko, Yu. D.EN: For the arcs of forward and reverse polarities there found extreme dependences value of electric current on cold drawing with a maximum at 60% strain. In order to explain the nature of the dependencies of value of electric current on cold drawing the equation for estimating electric current was used with the replacement of surface tension coefficient for the surface tension coefficient of the ferrite of low-carbon steel. Taking into account the fact that as cold drawing increases from 17 to 80% the size of cells is reduced by 30%, the value surface tension coefficient of the ferrite was increased approximately by 1.5 times. After substituting surface tension coefficient of the ferrite in the ratio it has been found sufficiently good agreement of value of electric current with the experimental values of the welding current for reductions of up to 60%. Increase of cold drawing over 60% has led to an increase in differences up to 14 – 22% between value of electric current and the obtained experimental data.Item Transformation of Structure During Friction Stir Welding(Silesian University of Technology, Poland, 2021) Vakulenko, Igor A.; Plitchenko, Sergey; Kurt, Bulent; Proydak, Svetlana V.; Askerov, HangardasEN: 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.Item Use of Electric Pulse Treatment for Relaxation Internal Stresess(DIA Ltd, Kyiv, 2017) Vakulenko, Ihor A.; Plitchenko, Sergey; Sokirko, V. A.; Nadegdin, Yurii L.; Efremenko, Vasiliy G.EN: The article deals with explanation of the effect redistribution of residual stresses after processing electrical pulses based on aluminum alloy after welding. The results indicate quite significant influence of electrical pulse treatment on both the morphology of alloy structural components and the relation of chemical elements involved in the formation of certain phases alloy. After the welding alloy had the majority of the signs of the cast condition with characteristic plate forms of the eutectic components. The use of EP has led to the quite significant qualitative changes in the internal structure. The globular structures formation indicates a high degree of EP influence on the development of structural change processes. Studying the chemical composition of the phase components was found out that the observed structural changes of alloy as a result of EP first of all may be caused by the redistribution of chemical elements, which form the compounds themselves. After the EP of the welded joint, the alloy hardness increase is accompanied by the decrease in the number of crystal structure defects and coarsening of the coherent scattering regions.