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    INVESTIGATION OF WEAR BEHAVIOR OF BORONIZED AISI 316 STAINLESS STEEL
    (2019) Topuz, Polat; Aydoğmuş, Tuna
    In this study, the wear behavior of boronized AISI 316 stainless steel was investigated. The chemical analysis ofthe sample to be used in the experiment was carried out with optical emission spectrometry before starting theboronizing experiment. Boronizing experiment using pack-boronizing method were carried out at 950°C for 3hours. As the boron source, a powder mixture having the commercial name Ekabor 2 consisting of SiC, B4C andKBF4, was used. As a result of the boronizing treatment, the boride layer formed on the surface of AISI 316,morphologically by Scanning Electron Microscope (SEM-BEI), thickness by optical microscope integrated visualanalyze system, hardness by Vickers indenter and chemical analysis by XRD (X-ray diffraction) device, wereinvestigated. Then, friction tests were carried out to determine the wear resistance of the boride layer. As a result,it is determined that the boron layer formed on the surface of boronized AISI 316 stainless steel, consists of adouble phase iron-boride layer. This layer is a columnar morphology and homogeneous thickness. Also it hasbeen determined to have ultra-hard and high wear resistance.
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    Invetigations of mechanical properties after dissimilar steels post-weld of Q345B steel
    (Pamukkale University, 2020) Çiçek, Bünyamin; Aydoğmuş, Tuna; Gündoğdu İş, Emine; 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.
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    Single Boride Layer (Fe2B) Formation of Borided AISI M2 High-Speed Steel
    (2023) Aydoğmuş, Tuna; Çiçek, Bünyamin; Topuz, Polat; Aydın, Özlem
    In this study, the boriding process of AISI M2, which is in the high-speed steel class, was carried out with the pack-boriding method. Samples of 20x20x15 mm were borided in an atmosphere-controlled furnace at 900, 1000, and 1100°C for 2,4, and 6 hours. For the boriding heat treatment, AISI 316 stainless steel crucible and a powder mixture with the trade name EKABOR 2 as boa riding agent were used. After the boriding process was completed, the samples were prepared for the metallographic study. Scanning electron microscope (SEM) with the help of backscattered electrons (BE) was used for microstructure investigations, and EDX (Energy Dispersive X-Ray Analysis) unit integrated into SEM and also XRD (X-ray diffraction) device were used for chemical analysis. After the microstructure and chemical analysis processes, hardness measurements were carried out on the boride layers formed on the surface of the samples. After the microstructure and chemical analysis processes, the hardness of the boride layers formed on the surfaces of the boronized samples was measured with a Vickers hardness device, using a 100 g. weight.As a result of the analyzes carried out, it was determined that AISI M2 high-speed steel can be borided, and it was determined that the boride layer formed on the surface was single-phase, unlike many steel types, and this phase was Fe2B. In addition, the results obtained were compared with the literature and the accuracy of the results was confirmed.