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Öğe Effect of Aging Treatment on Surface Roughness, Mechanical Properties, and Fracture Behavior of 6XXX and 7XXX Aluminum Alloys(Springer, 2014) Sevim, I.; Sahin, S.; Cug, H.; Cevik, E.; Hayat, F.; Karali, M.The effect of aging treatment on the surface roughness and mechanical properties of AA6061 and AA7075 alloys was studied. Microhardness and tensile tests were used to investigae the mechanical properties. X-ray diffraction analysis was used to investigate the surface of the specimens. Furthermore, after tensile tests fractured surfaces were examined with scanning electron microscopy. An atomic force microscope was employed for analysis of the effect of aging treatment on surface roughness. Higher surface roughness with an increase in the volume fraction of the precipitate was revealed.Öğe EFFECT OF LASER HARDENING ON THE MECHANICAL, TRIBOLOGICAL AND CORROSION PROPERTIES OF LOW ALLOY STEELS(Technical Faculty, Bor-Serbia, 2023) Albahlol, O. A. A.; Cug, H.; Akgul, Y.; Eticha, A. K.; Incesu, A.This research focuses on studying the mechanical, tribological, and corrosion behaviors of alloy steels: AISI 4340, AISI 5140, and AISI 8620 by laser hardening, respectively. In light of the tests which have been carried out meticulously, it is concluded that the optimum laser hardening parameter for all steel grades is 4 mm/s scanning speed and 1300 degrees C surface temperature. Micro-structural changes, Vickers hardness as mechanical properties, and tribological properties with reciprocating wear tests were carried out. Furthermore, corrosion tests were conducted. The test results reveal that the maximum hardness is achieved 50-300 mu m below the surface for all laser-hardened steels. Additionally, this study demonstrates that the wear resistance of steel is enhanced by the implementation of laser hardening. This study also determines that laser hardening has a positive impact on lifting the corrosion resistance behavior of AISI 4340 steel. In contrast, the corrosion resistance properties of AISI 8620 steel were reduced nearly by 54.17%.Öğe The Experimental Investigation of Punching of the AM60 and AZ61 Magnesium Alloy Sheets by Using Varied Punch Shapes(University of Kuwait, 2023) Cug, H.; Khalifa, S.S.M.; Gürün, H.The using of magnesium alloys for industrial sheet metal part production has become increasingly common in recent years. This research aims to characterize the effects of the cutting-edge shapes of the punches on the blanking forces and the sheared edge qualities in the blanking/piercing operations of magnesium alloy sheets. Magnesium sheets (AM60 and AZ61) were produced by casting and rolling processes. AM60 and AZ61 Mg alloys produced by casting were rolled by using two different speeds, 2.5 m/min and 7.5 m/min. Material thickness was adjusted to three mm in the rolling process. Blanking tests were carried out on a die-set and hydraulic press by varying shaped punches. In the experimental studies, flat-ended, concave shaped, and 16° angled punches were used. A loadcell was fixed to the experimental setup to determine the blanking forces. The results showed that the AM60 alloy was more resistant to shearing than the AZ61. The lowest blanking force was obtained by use of the 16° angled punch. It was determined that the using of flat-ended punches for blanking operations was more convenient according to the usage purpose of the parts while all three punches can be used for piercing operations. © 2023 University of Kuwait. All rights reserved.Öğe Influence of Nano-WC Addition on Wear Performances of Cu-Ni Matrix Nanocomposites(Polish Acad Sciences Inst Physics, 2019) Cug, H.; Demirtas, H.; Erden, M. A.; Akgul, Y.; Turan, M. E.; Zengin, O.The present study focuses on the effect of tungsten carbide content on wear behavior of Cu based composites which are generally preferred in engineering applications. Nickel 4 wt% was used as the binding agent in order to develop wetting ability between matrix and reinforcement. Cu-4Ni matrix composites were fabricated via powder metallurgy incorporating the different amount of present study focuses on the effect of tungsten carbide (0.5, 1 and 2 wt%). Wear tests were conducted using three different loads (5 N, 10 N and 20 N) in dry sliding conditions. Results showed that hardness of the composites increased with increasing tungsten carbide content. Tungsten carbide additions also lead to improving the wear resistance of copper matrix composites. Abrasive wear mechanism was generally observed for all samples especially for higher loads according to the scanning electron microscope (SEM) resultsÖğe Investigation of Microstructural and Mechanical Properties of Zirconium Carbide Reinforced Aluminum Matrix Nanocomposites(Polish Acad Sciences Inst Physics, 2019) Cug, H.; Zengin, O.This study aims to investigate the effect of zirconium carbide (ZrC) nanoparticles on mechanical performances of pure aluminum. Composites Al-0.5ZrC, Al-1ZrC, Al-2ZrC were fabricated by powder metallurgy. Hardness test was performed for all specimens. Compression test was conducted at room temperature. Results clearly show that homogenously distribution of nanoparticles was achieved up to 1 wt% reinforcement addition according to the scanning electron microscope results. The hardness of pure aluminum was increased significantly. Compression strength was also improved considerably with the addition of nano-reinforcements. Al-1ZrC composite showed best performance among the samples.Öğe Mechanical and Tribological Behaviors of Chopped Carbon/Glass Fiber Reinforced Hybrid Epoxy Composites(Semnan University, Faculty of Mechanical Engineering, 2022) Akgul, Y.; Alsbaaie, Y.A.Y.; Eticha, A.K.; Cug, H.This study aims to examine the mechanical and tribological behaviors of short glass fibers (SGFs) and short carbon fibers (SCFs) reinforced single-layer hybrid epoxy composites. Here, the hybrid composites reinforced SGFs and SCFs in two different ratios (5 wt.% and 10 wt.%) were produced by the hand layup method. In addition, only glass or carbon fiber reinforced composites were produced in the same proportions to compare with hybrid composites. To investigate the flexural bending strength of composites (E5GF, E10GF, E5CF, and E10CF) and hybrid composites (E5GCF and E10GCF), 3-point bending tests were conducted. Izod impact tests were performed to analyze the impact energy absorbing behaviors of specimens. The wear performance of samples was assessed by using 10 and 20N loads. Moreover, the morphology of broken and worn surfaces of samples was analyzed by a scanning electron microscope. According to test results, E10GCF hybrid composites had nearly 27.36% and 29.67% better flexural strength and impact energy-absorbing compared to (E10GF) glass fiber reinforced composites, respectively. However, only 10 wt.% carbon-reinforced composites showed the highest wear resistance and smooth worn surface among all the samples. Therefore, for structural applications, hybrid epoxy composites can be the favorite but for tribological purposes reinforcing epoxy with only carbon fiber should be advantageous. © 2022 Published by Semnan University Press. All rights reserved.
