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    Kinetic and mechanical properties of boronized AISI 1020 steel with Baybora-2 powder
    (Edp Sciences S A, 2023) Yamanel, Buenyamin; Erdem, Oguz; Bayca, Salih Ugur; Bican, Osman
    In this study, package boronizing process was applied to AISI 1020 steel by using Baybora-2 boronizing agent and the kinetics of boronizing process was investigated. The pack boronizing process was performed at 1223 and 1323 K temperatures for 2, 4 and 6 h. The properties of the boride layer formed on the surface as a result of the boronizing process were determined using optical microscopy and SEM analysis. XRD analysis was performed to determine the phases formed in the boride layer. As a result of the analysis, it was determined that the boride layer consisted of FeB and Fe2B phases. It was determined that the thickness of the boride layer increased with the increase of boronizing time and temperature. While the boride layer thickness for the temperature of 1223 K was between 115 and 196.3 mu m, the boride layer thickness for the temperature of 1323 K was found to be between 157.2 and 304.7 mu m. In this study, a boriding powder, patented and under development, was used and a surface layer with a hardness of 2224 HV was obtained on the surface of AISI 1020 steel. This hardness value is approximately 5 times the hardness values of steels hardened by traditional surface hardening methods such as cementation and nitriding. Also, considering the boride layer thicknesses, the activation energy was calculated as 162.26 kJ/mol using the classical kinetic method.
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    The Effects of Machining Parameters on Circularity Tolerance in Plasma Arc Cutting Method
    (Institute of Electrical and Electronics Engineers Inc., 2023) Hirtisli, Serafettin; Erdem, Oguz
    The concept of circularity in the machine assembly industry is of great importance, especially in hole-shaft connections and bolt-nut couplings. In order to reduce the production costs and to ensure the real function of the produced circular part, the circularity tolerance must be determined precisely. In recent years, the PAC method has been generally preferred in cutting the stainless steel sheets because the non-traditional manufacturing processes such as laser beam cutting or water jet cutting are very costly. The investigation of the drilled holes circularity on the stainless steel sheets with the PAC method has been investigated in this study. For this purpose, holes with a diameter of 40 mm were drilled with PAC method at different cutting speeds (151, 214 and 217 mm/min) and different gas pressures (0.6, 0.7 and 0.8 MPa) on AISI 304 stainless steel sheets with 4 and 8 mm thickness. The diameters of the drilled holes were measured with the help of a profile projection device and a digital gauge, the average diameter values and average circularity tolerances were calculated. In the machining of both 4 mm and 8 mm sheets, the circularity tolerance values increase as the cutting speed increases at constant pressure values. Similarly, when the cutting speed is constant, the circularity tolerance value increases as the gas pressure value increases. © 2023 IEEE.