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    Öğe
    Kinetic characterization of boride layers formed on AISI 316 stainless steel
    (Carl Hanser Verlag, 2020) Aydin, Ozlem; Topuz, Polat; Aydgomus, Tuna
    This paper presents the growth kinetics of the boride layer formed on a boronized AISI 316 (X5CrNiMo17-12-2) stainless steel surface. Samples were boronized applying the Ekabor 2 (TM) boronizing agent in an atmosphere controlled furnace at 1073, 1173 and 1273 K for 1, 2 and 3 h by the powder pack method. Surfaces of the samples which have completed the boronizing process were prepared for metallographic examinations. An optical microscope and an integrated image analyzer were used to measure the thickness of the boride layer formed on the surface of the samples. Due to the dual phase structure of the boride layer formed on the steels in order to see these phases in detail, an SEM (Scanning Electron Microscope) image of the sample was taken with the help of the back scattered electrons. In addition, for determination of the elements constituting these phases, elemental analysis was carried out with the help of an EDS (Energy Dispersive Spectroscopy) unit connected to SEM. Then XRD (Xray diffraction analysis) analyses were carried out to understand in detail which phases formed the boron layer. For hardness measurements of boride layers, a Vickers hardness device with 100 g weight was used. Finally, to determine the growth kinetics of the boronized samples, calculations were made with the help of the Arhenius equation and compared with the literature.
  • 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.