Browsing by Author "Durkaya, G."
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Conference Object Citation Count: 0Characterization of Thin Film Boron Nitride Coatings and Observation of Graphite-Like Boron Nitride(Polish Acad Sciences inst Physics, 2019) Durkaya, Göksel; Efeoglu, I.; Ersoy, K.; Cetin, B.; Kurtuldu, H.; Department of Metallurgical and Materials EngineeringCubic boron nitride is a coating solution to improve wear performances in demanding engineering applications. In order to achieve the best performance from this thin film system, the physical dynamics behind the phase compositions, phonon dynamics, surface quality, interfacial effects and stoichiometric relations should be understood. In this study, for this purpose, physical vapor deposition grown BN thin films were studied in detail using the Raman spectroscopy, atomic force microscopy, and scanning electron microscopy techniques.Conference Object Citation Count: 0Investigating the Effect of Auto-Focus and Auto-Threshold Algorithms in Advanced Nodularity Analysis of Austempered Ductile Iron Castings(Polish Acad Sciences inst Physics, 2019) Durkaya, Göksel; Davut, Kemal; Durkaya, G.; Davut, K.; Department of Metallurgical and Materials EngineeringAustempered ductile iron castings have a wide range of application fields including defense and heavy-duty industries due to their promising mechanical properties. Austempered ductile iron castings could provide excellent combination of high strength, toughness, and wear resistance at the same time. Unlike other spheroidal ductile cast irons, austempered ductile iron castings need to be processed by a special austempering heat treatment which enables the verification of the conformity of the nodularity level after the casting operations. Previous studies have shown that wide area mappings for determining nodularity are crucial to eliminate the representativeness problems. In this sense, some precautions should be taken for the accuracy of results in large scale nodularity examination. In this study, the effect of auto-thresholding and auto-focusing algorithms on the advanced nodularity analysis is investigated. The results suggest that auto-thresholding and auto-focusing methods have significant contributions for determining average nodularity levels and average graphite sizes.Conference Object Citation Count: 0Non-Invasive 3D Optical Measurement of Round Surfaces(Polish Acad Sciences inst Physics, 2019) Durkaya, Göksel; Durkaya, G.; Cetin, B.; Department of Metallurgical and Materials EngineeringPrecise measurement of wear profiles in large areas of round surfaces such as shafts, suspension bars and high-deviation geometry surfaces is a challenge in manufacturing engineering. An optical measurement method is developed to overcome this challenge. This method, relying on angular reconstruction of scattered light profiles, is used for the measurement of irregular wear in quality testing of round surfaces which provides information on estimating the surface lifetime after prolonged use. This approach achieves a 3D depth accuracy better than 50 mu m in suspension bars with diameters up to 50 mm from an imaging distance of 250 mm.