Browsing by Subject "Stainless steel alloys"

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    Tribological and adhesion properties of microwave-assisted borided AISI 316L steel
    (Walter de Gruyter GmbH, 2022) Ipek Ayvaz S.; Aydin I.
    In this study, AISI 316L stainless steel alloy samples were borided with powder-pack boriding method using Ekabor II powder with the support of a microwave furnace with a power of 2.9 KW and a frequency of 2.45 GHz. Boriding was carried out at 850, 900 and 950 °C temperatures for 2, 4 and 6 h of operation. A distinct diffusion barrier consisting of Fe-Ni-Si elements was detected in borided samples at 950 °C for 4 and 6 h. As a result of the Daimler Benz Rockwell-C adhesion tests, regions with insufficient adhesion strength were detected in these samples. In other samples, adhesion qualities between boride layers and substrate were in the range of HF1-HF3. The lowest specific wear rates were determined as 5.208 (mm3 Nm-1) × 10-6 and 5.210 (mm3 Nm-1) × 10-6 for the samples borided for 6 h at 850 °C and 4 h at 900 °C, respectively. It was determined that the increase in thickness of the brittle FeB compound increased the wear with the three-body abrasive wear mechanism. © 2021 Walter de Gruyter GmbH, Berlin/Boston.
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    Characterization of a Duplex Coating (Boriding + Hydroxyapatite) on Austenitic Steel
    (Pleiades Publishing, 2023) Ali Ihsan Bahcepinar; Safiye Ipek Ayvaz; Ibrahim Aydin
    Abstract: In this study, duplex coating process (Boriding + Hydroxyapatite) was applied to 316L stainless steel alloys. Before coating, the substrate materials were shotblasted with 300–500 µm glass beads in a vacuum type shot blast machine. Tribological properties of the alloy with boriding process, its bioactivity and biocompatibility was increased with the hydroxyapatite (HA) coating process. Powder pack boriding technique was used in boriding process and Electrophoretic deposition method (EPD) was used in HA coating process. At the end of the study, the microstructures (SEM), elemental analyzes of the coating surfaces (EDS), Ca/P ratios, coating thicknesses were determined. In addition, the hardness and adhesion qualities of the boride layer were determined. When the results obtained are evaluated, duplex layers were successfully formed for all parameters. © Pleiades Publishing, Ltd. 2023. ISSN 0031-918X, Physics of Metals and Metallography, 2023, Vol. 124, No. 14, pp. 1837–1844. Pleiades Publishing, Ltd., 2023. ISSN 0031-918X, Physics of Metals and Metallography, 2023. Pleiades Publishing, Ltd., 2023.
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    Effect of Shot Blasting on the Boriding Kinetics of AISI 316L Stainless Steel
    (Pleiades Publishing, 2023) Ayvaz S.İ.; Aydın İ.; Bahcepınar A.İ.
    Abstract: In this study, the effect of shot blasting on boriding kinetics of AISI 316L stainless steel alloy was investigated. For this purpose, AISI 316L samples were shot blasted at 6 bar pressure using 300–500 µm glass beads. Shot blasted samples were borided with powder pack boriding technique, using Ekabor 2 boriding powder, with 2, 4 and 6 boriding times at 850, 900 and 950°C boriding temperatures. As a result of boriding, boride layers consisting of FeB and Fe2B phases with a microhardness of ~1497–2135 HV0.1 and an average thickness of ~9.6–49.27 µm were obtained on the surface of AISI 316L stainless steel alloy samples. These boride layers on the AISI 316L stainless steel alloy surface were formed in flat morphology due to the high amount of alloying elements. In the kinetic studies, the activation energy of boron diffusion in AISI 316L stainless steel alloy was calculated as 204.68 kJ mol–1. The obtained results showed that shot blasting decreased the boron diffusion kinetics compared to the results in the literature. © 2023, Pleiades Publishing, Ltd.