Yazar "Turan, Muhammet E." seçeneğine göre listele

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    The effect of head hardening process on the residual stress of rails
    (Sage Publications Ltd, 2018) Turan, Muhammet E.; Ozcelik, Sait; Husem, Fazil; Ahlatci, Hayrettin; Sun, Yavuz; Tozlu, Ibrahim
    In this study, the head hardening process was employed, by using a mixture of air and water under laboratory conditions, to improve the residual stress behavior of R260 grade rails . For this purpose, three types of specimens were selected. One group of rails was heated up to the austenite stage and then cooled for 20 s; the next group was heated up to the austenite stage and then cooled for 40 s and the third group was not exposed to any heat treatment. The hardness results showed that the specimens cooled for 40 s had excessive hardness; the specimens cooled for 20 s exhibited similar properties as that of R350HT rail standards, which are especially preferred in the lower radius of curvature bends in railways, but not that of R260. According to the analysis of residual stress, all samples had compressive residual stress, but the specimens cooled for 20 s had the highest stress value.
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    Influence of multi-wall carbon nanotube content on dry and corrosive wear performances of pure magnesium
    (Sage Publications Ltd, 2018) Turan, Muhammet E.; Sun, Yavuz; Aydin, Fatih; Akgul, Yasin
    The present study aims to investigate the effect of Multi-Wall Carbon Nanotube on dry sliding and corrosive wear performance of pure magnesium. Multi-wall carbon nanotube reinforced composites with different weight fractions (0.25wt.% and 0.5wt.%) were fabricated by semi powder metallurgy. Hardness test was performed for all samples. To evaluate wear performance of the samples, three different loads (10 N, 20 N, and 40 N) were applied at the room temperature in both dry and 3.5wt.% NaCl corrosive environments. Worn surfaces and microstructures of the samples were characterized using Scanning Electron Microscope. Results show that carbon nanotubes embedded in the matrix without any macro-defects. The hardness of pure magnesium was improved with the addition of multi-wall carbon nanotube considerably. 0.5wt.% multi-wall carbon nanotube reinforced composite exhibited best wear performance both in dry and corrosive conditions.
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    Mechanical, tribological, and biological properties of carbon fiber/hydroxyapatite reinforced hybrid composites
    (Wiley, 2020) Akgul, Yasin; Ahlatci, Hayrettin; Turan, Muhammet E.; Simsir, Hamza; Erden, Mehmet A.; Sun, Yavuz; Kilic, Ali
    The present study aims to investigate the effect of short carbon fiber (SCFs) and hydroxyapatite (HAp) content on mechanical, tribological, and biological properties of high-density polyethylene (HDPE) matrix composites. The proposed HDPE/SCFs-HAp hybrid composites with good mechanical-tribological behavior and biocompatibility might be used as novel implants in orthopedics. The composites were developed using twin-screw extrusion and compression molding methods. Hardness, tensile, and 3-point bending tests were performed to investigate the mechanical properties of hybrid composites. To evaluate wear performance of the samples, three different loads (10, 20, and 30 N) were applied in simulated body fluid. Biological activities of the hybrid composite samples were investigated. Results show that HDPE-10%SCFs-10%HAp sample provides optimum mechanical, tribological, and biological properties.