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    Dry-sliding wear behavior of AISI 4140 barrel steel at elevated temperatures
    (Carl Hanser Verlag, 2020) Kocyigit, Fatih; Yildiz, Fethullah; Gok, M. Sabri; Cay, Vedat Veli
    In this study dry sliding wear behavior of AISI 4140 steel at given elevated temperatures was examined. The experiments were performed on a heat-modulated ball-on-disc wear device under 3, 5, 7 and 10 N loads at room temperature, 100, 200, 300 and 450 degrees C. 3D optical microscopy was performed for determining the volume loss of the worn samples. SEM (scanning electron microscopy) was used to determine the morphology of the worn surfaces of the samples while Raman spectrometry was used for determining oxide types occurring as a result of wear. Experimental applications showed that volume loses slightly increased as a function of indenter load elevation. The experiments performed at 300 degrees C, the volume loss ratios were found to be lower compared to all other samples. The highest volume loss was obtained in the experiments performed at 450 degrees C. Volume loss decreased in all samples under 10 N load. A tribological layer formed on the surface of samples subjected to a dry-sliding process. In the experiments performed at 100 degrees C and 200 degrees C, the delamination type was the dominant wear mechanism at all loads.
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    Effect of the powder particle size on the wear behavior of boronized AISI 304 stainless steel
    (Carl Hanser Verlag, 2015) Gunen, Ali; Kucuk, Yilmaz; Er, Yusuf; Cay, V. Veli; Oge, Mecit; Gok, M. Sabri
    In this study, the AISI 304 steel specimens were boronized with nanoboron of the size of 10-50 nm and commercial Ekabor 3 powders (<1400 mu m) at 950 degrees C to 1000 degrees C for 2 h and 4 h. Boronized steel specimens were characterized via SEM, microhardness and XRD analyses. Abrasive wear behavior of the specimens, boronized at different temperatures and treatment durations, were examined. The fixed ball micro-abrasion tests were carried out using the abrasive slurry, prepared with different SiC powder particle sizes on the boronized specimens at different rotational speeds. The specimens boronized with nanoboron powders exhibited a higher hardness and abrasive wear resistance than the samples boronized with the Ekabor 3 powders.