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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 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 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.Öğe Nanofibrous composite air filters(University of Ottawa Press, 2018) Akgul, Y.; Polat, Y.; Canbay, E.; Demir, A.; Kilic, A.[No abstract available]Öğe Optimization of gelatin nanofibrous webs fabricated via electrically assisted solution blow spinning for air filtration applications(Springer, 2024) Eticha, A. K.; Akgul, Y.This study aims to investigate the effects of gelatin concentration, air pressure, and an electric voltage on the average fiber diameter (AFD) and average droplet area (ADA) of nanofibrous webs to obtain filters with high filtration capacity. Most of the researched synthetic polymer-based air filters cause secondary pollution to the environment when their service period is over. Thus, replacing synthetic filters with nanofiber filters fabricated from biodegradable organic waste gelatin biopolymer is the novelty of this study. Nanofibers were spun from gelatin solution using a novel method: electrically assisted solution blow spinning (ESBS). According to test results, nanofibrous webs having a large area of droplets were noticed in samples having a lower gelatin-concentrated solution. Fibers with mean diameters in the range of 93.86 +/- 1.32 to 250.13 +/- 3.55 nm were produced via ESBS. On the other hand, Taguchi's ANOVA exhibited that gelatin concentration had a significant contribution of 98.27% to the variation of AFD of nanofibrous webs. It has also a notable effect of about 56.26% on the ADA of filter webs. Furthermore, an air filtration test revealed that a filtration efficiency of 90.5% for 0.3-mu m particle size at the expense of 225-Pa pressure drop was noticed on G-12120. Therefore, the quality factor of the optimized nanofibrous web was 0.0105 Pa-1. According to EN 1822 filter standards, the G-12120 nanofiber filter web was categorized under E10. Finally, G-12120 nanofiber filter media are effective to be applied in air filtration applications as an alternative to commercially available synthetic-based filters.
