Yazar "Çiçek, Bünyamin" seçeneğine göre listele

Listeleniyor 1 - 8 / 8
  • [ X ]
    Öğe
    Applicability of different powder and polymer recipes in a new design powder injection molding system
    (Walter De Gruyter Gmbh, 2021) Çiçek, Bünyamin; Sun, Yavuz; Türen, Yunus; Ahlatcı, Hayrettin
    Production methods are changing day by day with the developing technology. Based on this idea, a new production logic and machine have been developed owing to polymer-supported powder injection molding (PIM). The ability of this newly designed machine (newPIM) to mold metal or ceramic powders supported by polymer binders is discussed in this study. By taking advantage of the polymer properties such as fluidity and sticking, powders are molded with a specially developed machine with high gas pressure in certain sizes. In this study, in which many parameters are processed from feedstock (FS) production to molding; metals Mg/316L and ceramics SiC/SiO2 powders have been used in different powder sizes and structures. In the newPIM process, polymers were included in four different recipes. Paraffin wax (PW), polyethylene glycol (PEG), polypropylene (PP), ethylene-vinyl acetate (EVA), poly-methyl methacrylate (PMMA) and low-density polyethylene (LDPE) have been employed in the FS with different combinations. From FS production to the molding stage; pressure, microstructure examination, weight loss, and density change features were investigated. The result indicated that the best FS and molding was obtained by the PEG+PMMA polymer composition formed with a spherical powder with a diameter below 40 mu m. The compression force of the FS in this composition was observed at approximately 3.4k N values.
  • [ X ]
    Öğe
    Effects of alloying element and cooling rate on properties of AM60 Mg alloy
    (Iop Publishing Ltd, 2019) Elen, Levent; Çiçek, Bünyamin; Koç, Erkan; Türen, Yunus; Sun, Yavuz; Ahlatcı, Hayrettin
    Magnesium and its alloys have become important structural materials in the last couple of decades due to their exceptional and mechanical properties. In this study, the effects of the introduction Cd, Bi, and Sn alloying elements were introduced into AM60 alloys produced from Mg-Al-Mn triple junction in order to improve the microstructural and mechanical properties. The weight percent of the alloying elements was chosen as 0.5% wt besides the introduction of the additional alloying elements, the effect of cooling rate on microstructural and mechanical properties of the alloys have been investigated. The results showed that the alloying elements introduced to AM60 resulted in an improvement in the mechanical properties of the alloys, which is attributed to the changes in the microstructure. The higher cooling rate led to the formation of the finer a-Mg master matrix which in turn enhanced the mechanical properties of the alloys. It was observed that the intermetallic phase of beta-Mg17Al12 at the grain boundaries became thinner due to the rapid cooling rate and the introduction of the alloying elements, and the continuity decreased and the intergranular distance shortened. The addition of the alloying element increased the tensile strength of the AM60 alloy from 140 MPa to 210 MPa and the elongation values increased from 5% to 22%. The effects of the alloying elements and the cooling rate on the hardness and yields properties of the samples were also studied.
  • [ X ]
    Öğe
    Invetigations of mechanical properties after dissimilar steels post-weld of Q345B steel
    (2020) Çiçek, Bünyamin; Aydoğmuş, Tuna; İş, Emine Gündoğdu; Sun, Yavuz
    In this study, it has been reported that Q345B steel combine with different steels using electric arc welding method and the mechanical properties were investigated. Produced by hot rolling processes, Q345B steel is a low-alloyed medium tensile strength and highly usable steel. The steel used contain less than 0.2% carbon and less than 0.55% silicon, chromium and nickel. In this study, Q345B steel generally used at low-pressure/temperature zones in thermal power plant (boiler wall etc.) is combined with 16Mo3 and P265GH steels. The Q345B steel is welded to make the mechanical properties easy to compare. After joining, specimens were collected from the welded areas and used in the preparation of mechanical and metallographic processes. In this process, all joints were subject to tensile, charpy, hardness and bending tests. In addition, the collection of macro images from welding were used in observation of transition zones which were operated. Electrodes with a basic character cover were used (E7018) as filler metal in the joining processes. All mechanical tests met the requirements of the relevant standards and all welds were identified as valid weld.
  • [ X ]
    Öğe
    Material Production and the Effect of the System on Biocompatibility in the Modified Metal Injection Method
    (POLSKA AKAD NAUK, POLISH ACAD SCIENCES, INST METALL & MATER SCI PAS, 2023) Çiçek, Bünyamin; Sun, Yavuz
    In this study, the bio state of the alloy produced in the modified metal injection system was monitored after sintering. A new system operating with high gas pressure, far from the traditional injection model, has been established for material production. In this system, 316L stainless steel powders were molded using a PEG/PMMA/SA polymer recipe. During molding, approximately 60% 316L and 40% binder by volume were used. The samples obtained were sintered at different temperatures (1100-1300°C) after de-binding. Density measurement (Archimedes) and hardness tests (HV1) of the samples were measured as 6.74 g/cm3 and ~285 HV1, respectively. A potentiodynamic corrosion test was applied to monitor the effect of the amount of oxide in the structure of the 316L stainless steel produced. Corrosion tests were carried out in artificial body solutions. The corrosion rate was measured at the level of 17.08×10–3 mm/y. In terms of biocompatibility, a cytotoxicity test was applied to the samples and the life course of the bacteria was monitored. For the 316L alloys produced, the % vitality reached approximately 103%.
  • Küçük Resim
    Öğe
    Microstructural and mechanical characterization of 9Cr-1Mo-1W weld metal
    (Hitit University, 2018-09-01) Salur, Emin; Acarer, Mustafa; Kabakçı, Fikret; Keskinkılıç, Selçuk; Kumdalı Acar, Filiz; Çiçek, Bünyamin
    This paper presents microstructural and mechanical characterization of E911 welds metal. The types and transformations of the phases and microstructures of all-weld metal have been investigated through scanning electron microscopy, optical microscope, x-ray diffraction analysis. The elemental analysis and mechanical tests of the weld metal was determined by x-ray fluorescence, hardness measurements, and tensile tests respectively. This study will contribute the understanding of microstructural progression, microstructure characterization and mechanical properties of E911 steel after the post-weld heat treatment (PWHT).
  • Küçük Resim
    Öğe
    Sert lehimli paslanmaz çelik egzoz gazı geri dönüş boru bağlantılarının mekanik özelliklerinin incelenmesi
    (OTEKON, 2018) Özey, Nigar; Karabulut, Hüseyin; Hıdıroğlu, Mehtap; Çiçek, Bünyamin
    In this study, material selection and mechanical behavior of the piping system which is used in the automobile and connected systems, which are increasingly used in the developing world, and which are used during the transport of the various gases given to the exhaust system and the atmospheric environment are investigated. This work was carried out in a certain part of this piping system and the working principle of exhaust gas recirculation (EGR) was used. This part is made of 321 L quality stainless steel material with austenitic phase structure, high corrosion resistance and high working ability at high temperature. The joints of the stainless steel material in the austenitic phase structure are joined and the brazing technique is used in the pipe-flange connection stages and the joint is provided. The brazing process was performed with a solder solution (paste) in a humpback brazing furnace. Tension and tightness tests and grain enlargement annealing were applied at the connection parts of the pipe system which require mechanical inspection. In order to measure the chemical effects of the gases passing through the stainless pipe and the corrosive environment reaction of the material, the specimens were subjected to the corrosion behavior test. All tests were carried out in accordance with the relevant ASTM standards and on calibrated machines. Tensile strength, sealability (condition), corrosive damage analysis and grain size were determined based on the results obtained from these tests. These data are compared with those in the literature and the possibility of producing different materials for exhaust systems manufactured from stainless steel and exposed to gases such as oxygen and nitrogen has been investigated. As a result, 321L quality stainless steel material used in EGR system in automotive exhaust system has been investigated in this system.
  • Küçük Resim
    Öğe
    The effect of welding positions on the weldability of X20CrMoV11-1 steels
    (2018-01-01) Çiçek, Bünyamin; Gündoğdu İş, Emine; Gümüş, Emre; Topuz, Polat
    In the study, mechanical properties of martensitic steel X20CrMoV11-1 was investigated after being welded using Tungsten Inert Gas (GTAW) welding method at different weld positions (PC and PJ-EN 6947). The X20CrMoV11-1 steels have been widely used in thermal power plant applications in combustion chambers and other high-temperature parts. These materials experience extremely high internal pressure at the service conditions. WCrMoV12 Si was used as the filler metal in the welding. The GTAW welding process was conducted in a controlled manner and all the parameters used during the process was monitored. The post welding heat treatment was applied in order to eliminate the variations in the hardness of the welded materials. The samples were characterized using tensile, bending, hardness, and notch impact tests. Macro photographs were taken from the samples to observe the transition areas. The results indicated that the mechanical properties obtained from the samples welded in PC position were higher than those obtained from PJ position.
  • Küçük Resim
    Öğe
    Transfer of project development training to vocational high school students to three axis Mini CNC Router design: an applied study
    (Ahmet Akçay, 2017-12-31) Yıldırım, Ferdi; Doğan, Onur; Elen, Levent; Çiçek, Bünyamin
    The aim of this study is to determine the success of the project development and rehabilitation courses given to university students on their students. In this direction, theoretical and practical training was given to the students on the theoretical calculations of machine construction, machine design and manufacturing, assembly stages and system analysis and study. As a result of this training, students were asked to design and manufacture a three-axis mini CNC router. During the design and manufacturing process, the necessary technical support was provided to the students where they had problems. As a result of the study, it has been seen that the students have successfully transferred the theoretical knowledge they have received to CNC router design and manufacturing. After the manufacturing process is completed, a sample is processed and the functionality of the mini CNC router machine is tested and a successful result is obtained. In addition, student achievement was statistically analyzed with a written examination including CNC machine design, construction principles and manufacturing operations. The results and analyzes obtained when the exams are evaluated; shows that the success rate of the exam is 77.75% in the light of the theoretical and practical information that the students have taken during the project period.