Browsing by Author "Yüksel, N"

Now showing 1 - 7 of 7
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    Wear Behavior of Fe-C-Cr Based Hardfacing Alloys Dependent on Ferrovanadium and Ferrotungsten Addition
    (CARL HANSER VERLAG) Kapali, G; Sahin, S; Yüksel, N; Sargin, F; Yaman, B
    The aim of this study is to investigate the effect of vanadium and tungsten on wear behavior of Fe-C-Cr based hardfacing alloys. The wear behavior of hardfacing layers was determined by dry sand/rubber wheel abrasion tests according to ASTM G-65. The results of the abrasion tests were interpreted by metallographic examinations, SEM and EDX analyses as well as hardness measurements. According to the results of the experimental studies, the effect of W and V addition was discussed.
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    Mechanical Properties of Dissimilar and Similar Cold Metal Transfer Welded Galvanized Steel 1314 and Aluminum AA1050
    (CARL HANSER VERLAG) Irizalp, AO; Durmus, H; Yüksel, N; Türkmen, I; Uzun, O
    This study aims to investigate the weldability of 1050 aluminum alloy (AA1050) and galvanized 1314 steel by the cold metal transfer (CMT) procedur, comparing it with respective welding of similar aluminum sheets. Mechanical properties of welded specimens were determined by tensile testing and hardness measurements. The study was completed by microstructural analysis. The results showed that CMT welding can be applied successfully to join aluminum and steel.
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    The Effect of the Retrogression Process on the Wear Behaviour of a 7075 Aluminium Alloy
    (CARL HANSER VERLAG) Durmus, H; Uzun, RO; Sahin, S; Yüksel, N
    Retrogression and re-aging (RRA) process are applied in an attempt to enhance mechanical properties and corrosion resistance of 7075 aluminium alloys. In this study, retrogression and re-aging process have been applied to a 7075 aluminium alloy at 170 C for 5, 40, 80 min and wear resistance of RRA applied samples have been investigated by ball-on-disc wear test apparatus. Sliding distance has been chosen as 300 meters. Re-aging procedure has been carried out at 125 C for 10, 20 and 30 hours. Minimum wear loss has been obtained by retrogression for 40 min and aging for 30 hours.
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    WEAR BEHAVIOR OF Al/SiC/GRAPHITE AND Al/FeB/GRAPHITE HYBRID COMPOSITES
    (INST ZA KOVINSKE MATERIALE I IN TEHNOLOGIE) Sahin, S; Yüksel, N; Durmus, H; Irizalp, SG
    Silicon carbide is often the preferred reinforcement in the production of aluminium-powder composites. In this study, aluminium composites were produced with 10 % and 20 % silicon-carbide and ferroboron reinforcements and (0, 0.5, 1 and 1.5) % graphite additions using powder metallurgy. The effects of the reinforcement type, the amount and the graphite content on the wear resistance were investigated. When compared with the unreinforced aluminium sample, it was clear that the increasing reinforcement increased the wear resistance. It was determined that the increasing graphite content negatively affects the wear resistance. The sample including 20 % ferroboron and 0 % graphite showed the minimum wear rate.
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    Wear behavior-hardness-microstructure relation of Fe-Cr-C and Fe-Cr-C-B based hardfacing alloys
    (ELSEVIER SCI LTD) Yüksel, N; Sahin, S
    The aim of this study is the investigation of the effect of ferroboron and the amount of powder mixture (ferroboron + ferrochromium) on wear resistance of Iron (Fe)-Chromium (Cr)-Carbon (C) based hardfacing alloys. Powder mixture, consisting of ferrochromium (FeCr) and ferroboron (FeB), was added to massive wire during welding process. Hardfaced layers were obtained by three different powder mixtures and two different powder/massive wire proportions. Hardfacing was applied to AISI 1020 steel substrate by open arc welding. Hardness test, Scanning Electron Microscope (SEM) and X-Ray Diffraction (XRD) analysis, dry sand/rubber wheel abrasion test were executed. Test results showed that increasing ferroboron content and increasing powder mixture amount enhanced the wear resistance. (C) 2014 Elsevier Ltd. All rights reserved.
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    Cold metal transfer welding of AA1050 aluminum thin sheets
    (UNIV FED RIO DE JANEIRO, LAB HIDROGENIO) Irizalp, AO; Durmus, H; Yüksel, N; Türkmen, I
    This study was aimed to investigate the welding parameters on mechanical behavior of 2 mm thick AA1050 sheet materials joined by cold metal transfer (CMT) method. Macro structural examination showed that decreasing heat input decreased the pore size in the weld metal. Tensile test was applied and failure occurred in heat affected zone of aluminum sheet metal. Maximum tensile strength was found in the sample with minimum heat input. Heat affected zone was observed explicitly in the sample produced with the maximum heat input. Decreasing joint gap affected the bending strength positively. Bending strength was found superior with maximum bonding line length.
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    Effects of Ferroboron and Ferrochromium Powder Addition on Abrasive Wear Resistance of Fe-Based Hardfacing Coatings
    (CARL HANSER VERLAG) Yüksel, N; Sahin, S
    Ferrochromium is used in hardfacing alloys as carbide former. In this study, ferroboron was used with ferrochromium to investigate the effect on microstructure and wear resistance. Five different hardfacing alloys (50 % massive welding wire + 50 % powder mixture) were produced by open arc welding on AISI 1020 steel. Microstructure, SEM and XRD analysis, hardness test, and dry sand/rubber wheel abrasion test were carried out. According to the test results, as the amount of ferroboron increased, wear rate decreased. Minimum wear rate was obtained in 100 % ferroboron powder added sample.