Browsing by Author "Soy, G"

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    Cost Analysis of T6 Induction Heat Treatment for the Aluminum-Copper Powder Metal Compacts
    Tastan, M; Gökozan, H; Çavdar, PS; Soy, G; Çavdar, U
    This work compares an energy cost and an energy consumption results of the 4 wt.% cupper mixed aluminum based powder metal (PM) compacts processing under induction or furnace heating. Total power and energy consumptions and total energy costs per kilogram and compact have been analyzed. T6 precipitation heat treatment applications have been applied with two different methods, one with 2.8 kW, 900 kHz ultra-high frequency induction heating system (UHFIHS), other with 2 kW chamber furnace. In the first method, Al-Cu PM compacts have been heated by induction at 580 degrees C in one minute and then cooled down by water. Afterwards, the samples have been heated 170, 180, 190 and 200 degrees C respectively for artificial ageing and cooled naturally. In the second treatment, unlike the first study, Al-Cu PM compacts are heated by chamber furnace at 540 degrees C in 5 hours and cooled by water. Then PM compacts are artificially aged at 190 degrees C in 10 hours with same furnace. During both processes, energy and power consumptions for each defined process have been measured. Optimum heat treatment of the induction is determined. The cheaper energy cost is obtained by the induction heat treatment.
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    Analysis of artificial aging with induction and energy costs of 6082 Al and 7075 Al materials
    Tastan, M; Gökozan, H; Çavdar, PS; Soy, G; Çavdar, U
    In the study, 6082 Al and 7075 Al samples were subjected to a solution taking place at 580 degrees C for 1 min using ultrahigh frequency induction heating system (UHFIHS) and water was supplied at the end of the process. Artificially aging was then carried out at 190 degrees C for 2, 4, 6 and 8 min. In both applications, heating was carried out using an induction system with a frequency of 900 kHz and a power of 2.8 kW. For these aluminum series and shapes, induction heating and heat treatment costs in different shapes are calculated. In addition, the hardness values obtained from artificially aged 6082 Al and 7075 Al samples at 190 degrees C for 10 h were compared with conventional methods after 5 h at 540 degrees C for 5 h. As a result, the hardness values of 6082 Al samples, which were obtained in 10 h by conventional methods, were obtained by artificial aging for only 8 min using induction system.
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    INVESTIGATIONS ON THE MECHANICAL ALLOYING PROPERTIES OF AL 2024 ALLOY BY THREE-DIMENSIONAL BALL MILL
    Soy, G; Korucu, S
    Aluminum-based composite materials are frequently preferred in many new-generation engineering applications due to their high strength, wear and corrosion resistance, improvement of mechanical properties, machinability, and low density. Mechanical alloying has an important place in the production of composites with high properties in powder metallurgy, which is one of the composite material production methods. In this paper, the deformation of Al 2024 alloy powder, which is frequently used in the industry, is investigated by the three-dimensional ball mill. Three different rotation speeds (150, 200 and 250rev/min), three different ball-to-powder ratio (5:1, 10:1 and 20:1) and three different milling times (30, 60 and 90min) were used in the milling processes. Deformations in the powders were evaluated by particle size analysis and powder structure examination. The obtained results were analyzed with analysis of variance and regression method, three-dimensional graphics, and scanning electron microscope images. When the results are examined, the maximum percent areas covered by the deformed particles and maximum particle size among the selected experimental parameters were obtained at 250rev/min, 20:1 ball-to-powder ratio and 60min as 6.849% and 54 mu m.
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    Heat Treatment of 2024 and 5083 Aluminum Materials by Induction, a Competitive Method, and Cost Analysis
    Çavdar, U; Tastan, M; Gökozan, H; Soy, G; Çavdar, PS
    In the study, 2024 Al and 5083 Al bulk samples were heated using two different methods, induction and conventional heat treatment. Using these methods, the processing cost and time analysis for both materials were performed. 5083 Al material cannot be heat-treated. However, to evaluate differences in the production cost of induction by changing the components of aluminum, the same procedures were applied to 5083 Al material. In both aluminum series, square, cylindrical, and hexagonal shapes were processed, and the effect of sample shape variations on cost was evaluated. The heat treatment was performed in a conventional kiln of 2 kW. Al materials were heat-treated for 5 h at 540 degrees C, and water was suddenly supplied. Then they were left in the kiln at 190 degrees C for 10 h for artificial aging. Al samples were heat-treated in the same way at 590 degrees C for 1 minute in the 900 kHz ultra-high frequency induction heating system (UHFIHS), which was fed with instant water. The samples were then artificially aged at four different heating durations varying between 2 and 8 minutes using the induction system. As a result of examining the production time and cost of both methods, it was found that the heat treatment of 2024 Al samples by induction was much more advantageous. Furthermore, when Al samples were heated by induction, shape differences and main alloy elements significantly affected power consumption values.