Malzeme Bilimi ve Mühendisliği Bölümü Yayın Koleksiyonu
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Browsing Malzeme Bilimi ve Mühendisliği Bölümü Yayın Koleksiyonu by Author "48915"
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Article Citation Count: Karataş, Mustafa Serdar...et al. "A Comparison of Radiation Shielding of Stainless Steel With Different Magnetic Properties", Nuclear Technology and Radiation Protection, Vol. 29, No. 3, pp. 186-189, (2014).A Comparison of Radiation Shielding of Stainless Steel With Different Magnetic Properties(Vinca Inst Nuclear Sci, 2014) Çalık, Adnan; Akbunar, Şahin; Uçar, Nazim; Yılmaz, Nihat; Karakaş, Mustafa Serdar; Akkurt, İskender; 48915The radiation shielding properties of three different stainless steels have been investigated. For this purpose, linear attenuation coefficients at photon energy levels of 662 keV and 1250 keV have been mea sured. The obtained results showed that ferritic stainless steel was more capable in stopping the high energy photons than its non-magnetic counterpart. © 2014 Vinca Inst Nuclear Sci. All rights reserved.Article Citation Count: Ucar, N...et al. (20169. Diffusion Kinetics of Binary Ti-Ni Shape Memory Alloys. (2017)Conference: 3rd International Conference on Computational and Experimental Science and Engineering (ICCESEN) Location: Antalya, TURKEY Date: OCT 19-24. Acta Physica Polonica A, 132(3), 524-526.Diffusion Kinetics of Binary Ti-Ni Shape Memory Alloys(Polish Acad Sciences Inst Physics, 2017) Uçar, Nazım; Doğan, Şule; Özdemir, Ahmet Faruk; Karakaş, Mustafa Serdar; Çalık, A.; 48915In this work, the boriding of binary Ti-Ni shape memory alloys was carried out in a solid medium at 1173 and 1273 K for 2, 4, and 8 h using the powder pack method with Ekabor-Ni powders. The boride layer was characterized by optical microscopy and scanning electron microscopy. The obtained results show that boride layer thickness increases with the increasing boriding temperature and time. Depending on temperature and boride layer thickness, the diffusion process is thermally activated, with the mean value of the activation energy being close to 67 kJ/mol.Article Citation Count: Günen, Ali...et.al.,"Effect of borotitanizing on microstructure and wear behavior of Inconel 625", Surface & Coatings Technology, Vol.311, pp.374-382, (2017).Effect of borotitanizing on microstructure and wear behavior of Inconel 625(Elsevier Science BV, 2017) Kanca, Erdoğan; Günen, Ali; Çakır, Hüseyin; Karakaş, Mustafa Serdar; Gök, Mustafa Sabri; Küçük, Yılmaz; Demir, Mehmet; 48915nconel 625, a nickel-based superalloy, is used in a wide range of applications including the marine and petroleum industries under where it is subjected to harsh conditions such as high temperatures and highly corrosive environments. However, its wear resistance is limited and can be often considered unsatisfactory in some applications. If this alloy were to be used under abrasive wear conditions, its surface would have to be protected by a wear resistant coating. In this study, a two-step thermo-chemical borotitanizing treatment (including an initial boriding step followed by titanium diffusion) is proposed. Microstructural characterization (optical microscopy, scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction) and mechanical properties (induding micro-hardness and micro-abrasion wear) of the coated samples were conducted. Microstructural studies revealed a compact, homogenous, silicide-free coating, consisting of four distinct regions: a TiB2 layer, a multi-phase boride layer, a diffusion zone and the substrate. Hardness values were significantly higher than those obtained by standard boriding treatments. Due to the nano-sized bodding agents used, the coatings formed on the surface were thicker than coatings obtained by methods such as nitriding, paste bodding and pack-boriding, and comparable to that of laser boriding. The wear resistance was improved by up to ten times in comparison with untreated Inconel 625. Grooving was the effective wear mechanism in untreated Inconel 625. How-ever the increase in surface hardness achieved by the borotitanizing treatment changed the wear mechanism in the coated samples from grooving to rolling.Article Citation Count: Calik, A.; Ozbakir, O.; Karakas, S.; Ucar, N. (2017). Investigation of the Erosive Wear Resistance of Boronized Ash-Blowing Nozzles, Acta Physica Polonica A, 131(2), 252-254Investigation of the Erosive Wear Resistance of Boronized Ash-Blowing Nozzles(Polish Acad Sciences Inst Physics, 2017) Çalık, A.; Özbakır, O.; Karakaş, S.; Uçar, N.; 48915In this study, pack boronizing was applied to ash-blowing nozzles manufactured from AISI 1040 steels using Ekabor II powders as the boronizing source at a temperature of 1273 K for a duration of 8 h. Erosive wear tests of boride ash-blowing nozzles were carried out in ash delivery line of thermal reactor under actual working conditions. It was observed that erosive wear resistance of borided ash-blowing nozzles were increased 3 times as a result of the boronizing process. The improved wear resistance of the borided samples can be explained by increased surface hardness and higher work hardening.
