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    A basic study on artificial aging in Mg-10Al12Si+1Pb alloy
    (Iop Publishing Ltd, 2020) Cicek, Bunyamin; Aydogmus, Tuna; Sun, Yavuz
    In this study, research has been made on the aging of metal matrix composite materials produced by the in situ casting system. Mg matrix composite material was produced by the in situ casting system. In this study, 90%Mg + 10% Al12Si (wt) ingot casting was performed for alloy formation and 1% Pb was added as an alloying element to the melted structure. This study aims to examine the effect of the artificial aging (AA) process on hardness and microstructure after alloying and composite of Mg metal. The in situ casting system was used in the casting of Mg alloy under the Ar gas atmosphere. The material after required casting homogenization process; for the AA process, they were embedded in a powder graphite filled vessel and kept at 350 degrees C for 1 h and then quenched (with 25 degrees C water). Later; after quenching, the materials were kept at 150 degrees C for 2, 4, 12, 16 and 24 h and aged samples were obtained. Microstructure images were obtained from the samples by scanning electron microscope (SEM) and light optical microscope (LOM) and then the hardness values of the micro hardness device were measured. Grain structure because of AA heat treatment; showed changes according to un-aging material. The hardness value is directly proportional to the increasing aging time of the materials applied to the AA process; it was found that the levels increased approximately to 45% (86HV to 125HV) compared to the un-aging material and passed to the fixing phase.
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    The effect of graphene-nanoplatelet and nano-teflon on mechanical properties of UV photo-resin 3D printer products
    (Taylor & Francis Inc, 2022) Karaca, Tunahan Hakki; Cicek, Bunyamin; Aydogmus, Tuna; Sun, Yavuz
    In this study, a photo-resin 3D printer was used as an example of the additive manufacturing method. The aim of the study is to improve the mechanical values of resin printer products. For this purpose, the change of mechanical values with the effect of nanostructures added to the resin by a special mixing method was investigated. Micro images, surface quality, and layers of the products were analyzed by scanning electron microscope (SEM). Compression, tensile and impact tests were applied for mechanical values. Nano-graphene changed the mechanical values to negative. The nano Teflon addition showed an improvement of about 35%.
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    Invetigations of mechanical properties after dissimilar steels post-weld of Q345B steel
    (Pamukkale Univ, 2020) Cicek, Bunyamin; Aydogmus, Tuna; Gundogdu Is, 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.