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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.
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    Microstructure, hardness and high temperature wear characteristics of boronized Monel 400
    (Elsevier Science Sa, 2022) Kucuk, Yilmaz; Doleker, K. Mert; Gok, M. Sabri; Dal, Serkan; Altinay, Yasemin; Erdogan, Azmi
    Boronizing processes were carried out at 900 degrees C, 950 degrees C and 1000 degrees C for 2, 4 and 6 h to improve the wear performance of Monel 400 alloy. According to microstructure analyses and nanoindentation tests, Ni2B, FeNiB and FeB phases were detected as dominant phases in the boronized layer. Apart from this, it was observed that the amount of Cu deposits in the boronized layers increased depending on the increasing boronizing temperature. After the boronizing process, the boride layer thickness and hardness values were found to be in the range of 32-272 mu m and 12.76-17.83 GPa, respectively. From the results of dry sliding wear test, the wear volume loss values of the boronized Monel 400 alloy decreased by approximately 25 times compared to the untreated samples. The lowest volume loss value among all test samples was observed in the boronized sample at 950 degrees C for 4 h. In addition to the hardness value, it was determined that the morphology and mechanical properties of the boronized layer were also effective on the wear results. Plastic deformation, delamination and oxidation type wear mechanisms were observed as the dominant wear mechanisms in the room and high temperature tests of boronized samples.