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    Effect of the sintering temperature on the coating of duplex stainless steel with Ni3Al
    (Carl Hanser Verlag, 2018) Cay, Vedat Veli; Kati, Nida; Ozan, Sermin; Cetin, Tayfun
    In this study, duplex stainless steel was coated with Ni3Al powder via self-propagating high-temperature synthesis (SHS) and the effect of the sintering temperature on the coating characteristics was investigated. An SEM electron microscope with EDX (energy dispersive X-ray spectroscopy) was used to examine the microstructure of samples that were coated according to the SHS method and likewise to detect the element content of the phases in the structure. Microhardness tests were conducted on the samples to determine the mechanical properties of the coated material. As a result of these studies, it was found that duplex stainless steel can be reliably coated with an Ni3Al intermetallic compound. The increase in sintering temperature within the given range significantly decreased the size of the disconnected area which completely disappeared.
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    INVESTIGATION OF GAS PRESSURE EFFECT ON POWDER CHARACTERIZATION OF AZ31 ALLOY PRODUCED BY GAS ATOMIZATION METHOD
    (Yildiz Technical Univ, 2019) Akkas, Mehmet; Em Kara, Kamal Mohamed; Cetin, Tayfun; Boz, Mustafa
    In this study, the effect of gas pressure on the shape and size of the AZ31 alloy powder produced by using the gas atomization method was investigated experimentally. Experiments were carried out at 840 degrees C constant temperature, in 2 mm constant nozzle diameter and by applying 4 different gas pressures (5, 15, 25 and 35 bar). Argon gas was used to atomize the melt. Scanning electron microscope (SEM) to determine the shape of produced AZ31 powders, XRD and XRF analysis to determine the phases forming in the internal structures of the produced powders and the percentages of these phases and a laser measuring device for powder size analysis were used. The general appearances of AZ31 alloy powders produced had general appearances of complex, ligament, acicular, droplet, flake and spherical shape, but depending on the increase in gas pressure, the shape of the powders is seen to change mostly towards droplet and spherical.
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    'Investigation of the effect of gas pressure on powder characterization of AM60 magnesium alloy powder produced by gas atomization method
    (Gazi Univ, Fac Engineering Architecture, 2020) Cetin, Tayfun; Akkas, Mehmet; Boz, Mustafa
    In this study, the effect of gas pressure on the shape and size of AM60 magnesium alloy powder produced by the gas atomization method has been experimentally investigated. The experiments were carried out at a constant temperature of 820 degrees C with a 2 mm nozzle diameter and 4 different gas pressures (5, 15, 25, 35 bar). Argon gas was used to atomize the melt. In order to determine the shape of the AM60 powder produced, scanning electron microscope (SEM), XRD, XRF and SEM-EDX analysis were used to determine the phases formed in the internal structures of the powders and the% ratios of these phases, and laser measuring device was used for the powder size analysis. Hardness tests were performed to determine the mechanical properties of the powders produced. The general appearance of the AM60 alloy powders produced was ligament, acicular, droplet, flake and spherical in shape, but due to the increase of gas pressure, the shape of the powders changed mostly towards flake and spherical. It was determined that the finest powder was formed at 820 degrees C, 35 bar gas pressure at 2 mm nozzle diameter and the powder was generally complex.