Browsing by Author "Saklakoglu I.E."
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Item Mechanical properties and microstructural evaluation of AA5013 aluminum alloy treated in the semi-solid state by SIMA process(2004) Saklakoglu N.; Saklakoglu I.E.; Tanoglu M.; Oztas O.; Cubukcuoglu O.The microstructure and mechanical properties of AA5013 aluminum alloys prepared by strain-induced melt activation (SIMA) process were studied to investigate the effects of cold working and heat treatment conditions. The specimens subjected to deformation ratios of 30 and 50% and various heat treatment time and temperature regimes were characterized in the present study. The results revealed that for the desired microstructure of the alloy, the optimum heat treatment temperature and time were 650°C and 60min, respectively, for both deformation ratios. However, the specimens with 50% cold working exhibited more brittle behavior while they contain finer grains with uniform distribution along the cross-sections as compared to 30% cold working. © 2004 Elsevier B.V. All rights reserved.Item Characterization of austenitic stainless steel after plasma immersion nitrogen and carbon implantation(Elsevier Ltd, 2007) Saklakoglu I.E.; Saklakoglu N.; Short K.T.; Collins G.A.It has been shown in the literature that plasma immersion ion implantation (PIII) can increase the wear resistance of austenitic stainless steel without losing its corrosion resistance. In this work, the effect of PIII treatment with C ions introduced into the chamber during the process on the tribological properties of AISI 316 L stainless steel has been studied and the results compared. © 2006 Elsevier Ltd. All rights reserved.Item The life of WC-Co cutting tools treated by plasma immersion ion implantation(2007) Saklakoglu I.E.; Saklakoglu N.; Ceyhun V.; Short K.T.; Collins G.In this study, the tool life of plasma immersion nitrogen-implanted cutting inserts while machining AISI 4140 steel has been investigated. The implantation time was 5 h and the temperature was in the range 320-520 °C. Implantation dose was ∼2×1018 ions cm-2 for all treatments. Surface topography of the implanted surfaces was obtained from atomic force microscopy. Results of the turning tests are discussed in terms of tool life (flank wear) and surface roughness of the workpieces. The results show that plasma immersion nitrogen implantation increased tool life by about 85%. © 2006 Elsevier Ltd. All rights reserved.Item Sliding wear behaviour of Zr-ion-implanted D3 tool steel(2007) Saklakoglu N.; Saklakoglu I.E.; Ceyhun V.; Monteiro O.R.; Brown I.G.The wear and friction characteristics of zirconium-ion-implanted AISI D3 tool steel have been investigated using pin-on-disc methods. Ion implantation was carried out using a vacuum-arc-based ion implanter to form multicharged zirconium ion beams at a mean ion energy of 130 keV, and the implantation doses investigated were approximately 3.6×1016, 5×1016 and 1×1017 ions cm-2. It was found that Zr implantation decreased both the wear and the coefficient of friction. The beneficial effects of Zr implantation in terms of associated Auger electron spectroscopy, Rutherford backscattering spectroscopy and scanning electron microscopy microprobe analyses are described. © 2006 Elsevier Ltd. All rights reserved.Item Formation of globular microstructure in A380 aluminum alloy by cooling slope casting(2011) Saklakoglu N.; Gencalp S.; Kasman S.; Saklakoglu I.E.Thixoforming and related semi-solid processing (SSP) methods require thixotropic materials. One of the many SSP techniques is the cooling slope (CS) casting process, which is simple and has minimal equipment requirements, and which is able to produce feedstock materials for semisolid processing. When the feedstock is reheated to the semisolid temperature range, nondendritic, spheroidal solid particles in a liquid matrix suitable for thixoforming are obtained. In this study, equipment for the CS technique was first established, and then the effects of the pouring temperature and inclined slope angle on the microstructures of A380 aluminum alloy (ISOAlSi8Cu3Fe) were studied. Optimum parameters for thixoforming experiments were selected, and it was found that the microstructure produced by the inclined plate depended on its angle and the pouring temperature. © (2011) Trans Tech Publications, Switzerland.Item Performance of Fe-based hardfacings on hot forging die: Experimental, numerical and industrial studies(Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, 2018) Saklakoglu N.; Irizalp S.G.; Dogan S.; Ildas G.; Saklakoglu I.E.This paper is an investigation into the use of Fe-based alloys as part of wear resistant hardfacing materials in AISI 1.2714 tool steel. Four different weld hardfacing alloys were deposited on 1.2714 steel substrates using tungsten inert gas welding (TIG) process. Wear tests were carried out using a pin-on-disc wear tester at room temperature. Microhardness and micrographs of the weld overlays were obtained. High-Temperature properties were estimated by numerical analysis. The phases of the hardfacings were obtained by XRD and also estimated by numerical analysis. The results from the laboratory tests were then compared with the results obtained from field studies. The results showed that some Fe-based alloys improved dies lifetime; others created poor surfaces. A Fe-based hardfacing alloy D which included high C with Cr, W, Mo had the best wear behavior among the weld overlays. © 2018 Institute of Materials and Machine Mechanics, Slovak Academy of Sciences. All rights reserved.Item Performance of Fe-based hardfacings on hot forging die: Experimental, numerical and industrial studies(Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, 2018) Saklakoglu N.; Irizalp S.G.; Dogan S.; Ildas G.; Saklakoglu I.E.This paper is an investigation into the use of Fe-based alloys as part of wear resistant hardfacing materials in AISI 1.2714 tool steel. Four different weld hardfacing alloys were deposited on 1.2714 steel substrates using tungsten inert gas welding (TIG) process. Wear tests were carried out using a pin-on-disc wear tester at room temperature. Microhardness and micrographs of the weld overlays were obtained. High-temperature properties were estimated by numerical analysis. The phases of the hardfacings were obtained by XRD and also estimated by numerical analysis. The results from the laboratory tests were then compared with the results obtained from field studies. The results showed that some Fe-based alloys improved dies lifetime; others created poor surfaces. A Fe-based hardfacing alloy D which included high C with Cr, W, Mo had the best wear behavior among the weld overlays. © 2018 Institute of Materials and Machine Mechanics, Slovak Academy of Sciences. All rights reserved.