Study the was to investigate the structural properties of Al-Cu alloys 
depending on the heating temperature of the alloy above the liquidus, the cooling 
rate

BARTASHEVSKA, Ludmila

FILONENKO, Nataliia

VANOV, Nikita

Барташевсая, Л. И.

Барташевсая, Людмила Ивановна

Барташевська, Л. І.

Барташевська, Людмила Іванівна

English

IVANOV, Nikita

Scientific hub Dnipro University of Technology

134  ANALYTICAL STUDY OF MECHANICAL PROPERTIES OF ROD-LIKE CENTRALIZERS FOR CASING TUBES  SHATSKYI Ivan1, VELYCHKOVYCH Andrii2, VYTVYTSKYI Ivan2,  SENIUSHKOVYCH Mykola2 & DUTKIEWICZ Maciej3 1Ivano-Frankivsk Branch of Pidstryhach-Institute for Applied Problems in Mechanics and Mathematics, NAS of Ukraine, Ukraine 2Ivano-Frankivsk National Technical University of Oil and Gas, Ukraine 3University of Science and Technology, Bydgoszcz, Poland  Purpose. The paper aims at studying the influence of the axial mobility of the centralizer’s ends on the parameters of its rigidity and strength. These characteristics are necessary to assess the passability of the casing string and quality of well completions. Methodology. Classical linear theory of shallow rods was used to model operating link of the centralizer. Physically the rod was taken for inextensible along the axis and elastic for bending.  Findings. The problem of the interaction of elastic rod casing centralizers with the wellbore wall is considered. The stress-strained state of the arcuate rod with six various fastening options in the conditions of point contact was studied. Analytical dependences between the contact force and the mutual convergence of the casing string and the borehole wall, as well as formula for the equivalent stress were determined. A way of fastening the rod along the axis of the pipe significantly affects these characteristics, in particular, presence or absence of reciprocal displacements of the ends of the rod in the axial direction. The engineering formulae of two-side estimations of rigidity and strength of real centralizers’ designs were obtained. They contain the researches, which were conducted within the project ВБ-14/23/11, financed by National Academy of Sciences of Ukraine. Keywords: casing centralizer, rod, contact interaction, stressed state, rigidity, strength   INFLUENCE OF OVERHEATING AND COOLING RATE ON THE STRUCTURE AND PHYSICOCHEMICAL PROPERTIES OF AL-CU ALLOYS  FILONENKO Nataliia1,2, BARTASHEVSKA Ludmila3 & IVANOV Nikita1 1State institution "Dnipropetrovsk Medical Academy of Ministry of Health of Ukraine" 2Iron and Steel Institute named after Z. I. Nekrasov of the National Academy of Sciences of Ukraine (ISI NASU) 1Dnipro University of Technology, Dnipro, Ukraine  Purpose. Study the was to investigate the structural properties of Al-Cu alloys depending on the heating temperature of the alloy above the liquidus, the cooling rate [1-3]. 135  Methodology. The investigations were carried out on Al-Cu alloy samples with copper content 25,0 -36,0% (mass.), the rest is aluminum. The melting of samples was carried out in a Taman furnace at temperatures of 820-1100 K with a graphite heater in alund crucibles. Cooling rate of alloys was 10 K/s. Part of the samples were made using the same method, but after heating poured into wedge shapes, at the expense of which when cooled in the wide part of the wedge the cooling rate was obtained 102 K/s, and in the thin part  104 K/s. In the work we use differential thermal, metallographic, chemical and X-ray spectroscopic analyses. Findings. The effect of overheating of the melt and cooling rate of alloys of the Al-Cu system with a copper content of 25.0-36.0% ( mass.), the rest of the aluminum is investigated. It is shown that an overheating of the liquid at 50-100 K above the liquid-liquid line leads to the formation of a fine-dispersed eutectic structure and the inhibition of the formation of primary aluminum crystals in the pre-evacuation of alloys and the Al2Cu phase in hypereuvtectic alloys, in accordance. An increase in the melt overheating temperature by 150 K above the liquid-liquid line and the subsequent cooling at 103-104 K/s leads to the complete inhibition of the formation of primary crystals. An overheating of the melt on 100-150 K alloys above the liquid line and subsequent cooling with a velocity of 103-104 K /s reduces the rate of corrosion by 30-45% and increases the numerical value in 1,3-1,45 times the relative wear resistance, and the brittleness of alloys decreases in 1,2-1,35 times in comparison with the samples after casting. Keywords: melt, overheating of the alloy above the liquidus line, Al-Cu alloy, Al2Cu phase, eutectic References 1. Murray J. L., (1985) The aluminium-copper system, Meta. International ls Reviews. 30, 211-235.  2. Plevachuk Y., Sklyarchuk V., Yakymovych A, Eckert S., Willers B., (2008) Eigenfeld Density, Viscosity, and Electrical Conductivity of Hypoeutectic Al-Cu Liquid Alloys, Metallurgical and Material stransactions. 39, 3040-3045.  3. Konstantinova N.Yu., Popel P.S., Yagodin D.A., (2009)  Kinematicheskaya vyazkost zhyidkih splavov med-alyuminiy, ТВТ, 47, №3 pp. 354- 359.   ELASTIC-DISSIPATIVE STABILIZATION OF DYNAMIC PROCESSES OF HYDROPULSE SYSTEMS OF MINING MACHINES  SHEVCHUK Stepan & SLIDENKO Viktor National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Ukraine  Purpose. Investigation of elastic-dissipative stabilization of dynamic processes of hydropulse systems of mining machines. 

INFLUENCE OF OVERHEATING AND COOLING RATE ON THE  STRUCTURE AND PHYSICOCHEMICAL PROPERTIES OF AL-CU  ALLOYS

83  Based on these models, the distribution of the underground electric field, its effect on the occurrence of stray currents, and possible ways of reducing the impact and magnitude of the current on the metal structure, which is possible with the use of renewable energy sources, in particular solar panels, is analyzed. Based on the analysis, soil and humidity of the subway tunnel play an important role in reducing the negative impact of the wandering (parasitic) current, which in turn emphasizes the need for research in this direction and the creation of a mathematical model for a more detailed analysis of this problem. Keywords: subway, stray currents, problem, solar panel References 1. Pivnyak, G., Dychkovskyi, R., Smirnov, A., & Cherednichenko, Y. (2013). Some aspects on the software simulation implementation in thin coal seams mining. Energy Efficiency Improvement of Geotechnical Systems, 1-10. DOI: https://doi.org/10.1201/b16355-2 2. Pivnyak, G., Dychkovskyi, R, Bobyliov, O., Cabana, C.E., Smoliński, A. (2018). Mathematical and Geomechanical Model in Physical and Chemical Processes of Underground Coal Gasification. Solid State Phenomena, (277), 1-16. doi: https://doi.org/10.4028/www.scientific.net/SSP.277.1 3. Шкрабець Ф.П. The systems of backup power supply based on Renewable energy sources for mobile facilities / Ф.П. Шкрабець, П.Ю. Красовський, В.В. Бердник // Науковий вісник НГУ. - 2017. - № 2 - с. 81-86. 4. Машинно-трансформаторний агрегат для вітроенергетичних установок/ Панченко В.И., Цыпленков Д.В., Гребенюк А.Н., Кириченко М.С., Бобров А.В. // Електротехніка і електромеханіка: науково-практ.журнал. - Х.: НТУ «ХПІ», 2016. - №1. – С. 33-37. doi: 10.20998/2074-272X.2016.1.06 5. Альтернативна енергетика в Україні: монографія / Г.Г. Півняк, Ф.П. Шкрабець; Дніпропетровськ: Нац. гірн. ун-т. Д.: НГУ, 2013. –109 с.   INFLUENCE OF OVERHEATING AND COOLING RATE ON THE STRUCTURE AND PHYSICOCHEMICAL PROPERTIES OF AL-CU ALLOYS  FILONENKO Nataliia1,2, BARTASHEVSKA Ludmila3 & IVANOV Nikita1 1State institution "Dnipropetrovsk Medical Academy of Ministry of Health of Ukraine" 2Iron and Steel Institute named after Z. I. Nekrasov of the National Academy of Sciences of Ukraine (ISI NASU) 3Dnipro University of Technology  Purpose. Study the was to investigate the structural properties of Al-Cu alloys depending on the heating temperature of the alloy above the liquidus, the cooling rate [1-3]. 84  Methodology. The investigations were carried out on Al-Cu alloy samples with copper content 25,0 -36,0% (mass.), the rest is aluminum. The melting of samples was carried out in a Taman furnace at temperatures of 820-1100 K with a graphite heater in alund crucibles. Cooling rate of alloys was 10 K/s. Part of the samples were made using the same method, but after heating poured into wedge shapes, at the expense of which when cooled in the wide part of the wedge the cooling rate was obtained 102 K/s, and in the thin part  104 K/s. In the work we use differential thermal, metallographic, chemical and X-ray spectroscopic analyses. Findings. The effect of overheating of the melt and cooling rate of alloys of the Al-Cu system with a copper content of 25.0-36.0% ( mass.), the rest of the aluminum is investigated. It is shown that an overheating of the liquid at 50-100 K above the liquid-liquid line leads to the formation of a fine-dispersed eutectic structure and the inhibition of the formation of primary aluminum crystals in the pre-evacuation of alloys and the Al2Cu phase in hypereuvtectic alloys, in accordance. An increase in the melt overheating temperature by 150 K above the liquid-liquid line and the subsequent cooling at 103-104 K/s leads to the complete inhibition of the formation of primary crystals. An overheating of the melt on 100-150 K alloys above the liquid line and subsequent cooling with a velocity of 103-104 K /s reduces the rate of corrosion by 30-45% and increases the numerical value in 1,3-1,45 times the relative wear resistance, and the brittleness of alloys decreases in 1,2-1,35 times in comparison with the samples after casting. Keywords: melt, overheating of the alloy above the liquidus line, Al-Cu alloy, Al2Cu phase, eutectic.  References  1. Murray J. L., (1985) The aluminium-copper system, Meta. International ls Reviews. 30, 211-235.  2. Plevachuk Y., Sklyarchuk V., Yakymovych A, Eckert S., Willers B., (2008) Eigenfeld Density, Viscosity, and Electrical Conductivity of Hypoeutectic Al-Cu Liquid Alloys, Metallurgical and Material stransactions. 39, 3040-3045.  3. Konstantinova N.Yu., Popel P.S., Yagodin D.A., (2009)  Kinematicheskaya vyazkost zhyidkih splavov med-alyuminiy, ТВТ, 47, №3 pp. 354- 359. 

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INFLUENCE OF OVERHEATING AND COOLING RATE ON THE STRUCTURE AND PHYSICOCHEMICAL PROPERTIES OF AL-CU ALLOYS

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