Yazar "Oktay, Mehmet" seçeneğine göre listele

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    Investigation of Microstructure and Mechanical & Electrochemical Behaviors of Martensitic Stainless Steel (MSS) and Alloyed White Cast Iron (WCI) Rolls Fabricated by a Centrifugal Casting
    (Bursa Teknik Üniversitesi, 2020) Oktay, Mehmet; Taşcı, Efe; Küçükelyas, Burak; Uzunsoy, Deniz
    The present study focuses on the production of two kinds of composite rolls by the horizontal centrifugal casting process and the investigation of the chemical composition, microstructure, mechanical & electrochemical behaviors of the products. Alloyed white cast iron (WCI) and martensitic stainless steel (MSS) were successfully produced with this method. The chemical compositions of the produced materials were examined by X-Ray Fluorescence Analysis (XRF). The microstructural properties were examined using an optical microscope (OM). These produced rolls are developed for grinding purposes. The rolls used in the grinding process must also have higher hardness values, so Vickers hardness measurements are performed on the WCI and MSS alloys. Moreover, produced rolls intended to work in corrosive working environment as well. Due to these requirements, the corrosion resistance plays important role for these rolls. Corrosion behavior of casted samples were investigated via potentiodynamic polarization measurements.
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    Microstructure and Surface Roughness Connection on Machined Ductile Iron: An Experimental Determination
    (EDP Sciences, 2024) Teke, Ibrahim T.; Oktay, Mehmet; Baykara, Celalettin; Ertas, Ahmet H.
    Ductile iron is useful for a variety of engineering challenges because of its ductility and high strength. Hence, it is an excellent option if machining is required. After milling operations, however, various surface characteristics could be created, and surface roughness could be assessed. On the other hand, machined surface roughness is constrained by production requirements. As a result, the association between surface roughness and machining parameters has been studied in the literature. Studies that focus on the relationship between surface roughness and microstructure in the context of material qualities are also available. In this study, an experimental investigation of a part made of EN-GJS-600-3 material took into account the significance of the interaction between microstructure and surface roughness. In addition to machining parameters, surface roughness, hardness (Brinell Hardness), and microstructure of machined surfaces are taken into consideration. The findings show that surfaces with pearlitic compositions are highly abrasive. Hardness rose along with an increase in the pearlitic phase. The number of spheres and surface roughness follow the same trend. © The Authors, published by EDP Sciences. This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0 (https://creativecommons.org/licenses/by/4.0/).