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31 results on '"Ruktuev, Alexey"'

14. Heat Treatment Induced Structural Transformations and High-Temperature Oxidation Behavior of Al 21 Co 22 Cr 22 Fe 13 Ni 22 High-Entropy Coatings Produced by Non-Vacuum Electron Beam Cladding.

Author

Ogneva, Tatiana, Emurlaev, Kemal, Malyutina, Yulia, Domarov, Evgeny, Chakin, Ivan, Ruktuev, Alexey, Riabinkina, Polina, Yurgin, Aleksandr, and Bataev, Ivan

Subjects
HEAT treatment, VACUUM arcs, SURFACE coatings, ELECTRON beams, OXIDATION, SCANNING electron microscopy, MICROSCOPY
Abstract

In this study, Al21Co22Cr22Fe13Ni22 high-entropy coatings were produced on steel substrates by non-vacuum electron beam cladding of Co, Cr, and NiAl powders. The high-temperature oxidation behavior of the coatings was studied by holding the specimens at 900 °C in air. The microstructure and phase constitution of the samples were studied both in the as-cladded state and after the heat treatment. The microstructure was characterized using light microscopy (LM) and scanning electron microscopy (SEM). Synchrotron X-ray diffraction (SXRD) and energy-dispersive X-ray spectroscopy (EDX) were used to study the phase constitution of the coatings and the "coating-substrate" interface. The coating consisted of disordered bcc (A2), ordered bcc (B2), and disordered fcc (A1) phases. Annealing the coatings for 50 h at 900 °C led to the formation of fcc precipitates in the bcc dendritic grains and a mixture of fcc and σ-phase particles in the interdendritic regions. Needle-like nanosized B2-precipitates were formed due to annealing in the fcc grains at the coating/substrate interface. The microhardness at the top of the as-cladded coating was 585 HV and gradually decreased towards the substrate. A more uniform distribution of the microhardness was obtained after the annealing. Its average value was 441 HV. Rhomboid Cr2O3, needle-like Al2O3, and spinels of a different morphology were found on the surface of the samples after oxidation at 900 °C. [ABSTRACT FROM AUTHOR]

Published
2023
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15. Structural characterization of layers fabricated by non-vacuum electron beam cladding of Ni-Cr-Si-B self-fluxing alloy with additions of niobium and boron

Author

Zimogliadova, Tatiana A., primary, Bataev, Anatoly A., additional, Lazurenko, Daria V., additional, Bataev, Ivan A., additional, Bataev, Vladimir A., additional, Golkovskii, Mikhail G., additional, Saage, Holger, additional, Ogneva, Tatiana S., additional, and Ruktuev, Alexey A., additional

Published
2022
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21. Structural Features and Corrosion Resistance of Fe66Cr10Nb5B19 Metallic Glass Coatings Obtained by Detonation Spraying

Author

Kuchumova, Ivanna D., primary, Eryomina, Marina A., additional, Lyalina, Natalia V., additional, Dudina, Dina V., additional, Batraev, Igor S., additional, Ulianitsky, Vladimir Yu., additional, Shtertser, Alexandr A., additional, Cherkasova, Nina Yu., additional, Ruktuev, Alexey A., additional, Ukhina, Arina V., additional, Borisenko, Tatiana A., additional, Koga, Guilherme Yuuki, additional, Kiminami, Claudio Shyint, additional, and Jorge, Alberto Moreira, additional

Published
2021
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23. In-situ study of the processes of damage to the tungsten surface under transient heat loads possible in ITER

Author

Vyacheslavov, Leonid N., primary, Vasilyev, Alexander A., additional, Arakcheev, Alexey S., additional, Cherepanov, Dimitrii E., additional, Kandaurov, Igor V., additional, Kasatov, Alexander A., additional, Popov, Vladimir A., additional, Ruktuev, Alexey A., additional, Burdakov, Alexander V., additional, Lazareva, Galina G., additional, Maksimova, Anastasia G., additional, and Shoshin, Andrey A., additional

Published
2021
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24. Structural Features and Corrosion Resistance of Fe66Cr10Nb5B19 Metallic Glass Coatings Obtained by Detonation Spraying.

Author

Kuchumova, Ivanna D., Eryomina, Marina A., Lyalina, Natalia V., Dudina, Dina V., Batraev, Igor S., Ulianitsky, Vladimir Yu., Shtertser, Alexandr A., Cherkasova, Nina Yu., Ruktuev, Alexey A., Ukhina, Arina V., Borisenko, Tatiana A., Koga, Guilherme Yuuki, Kiminami, Claudio Shyint, and Jorge Jr., Alberto Moreira

Subjects
GLASS coatings, METAL coating, METALLIC glasses, CORROSION resistance, CARBON steel, CORROSION potential, SURFACE coatings
Abstract

In the present work, Fe66Cr10Nb5B19 metallic glass coatings deposited by detonation spraying (DS) on carbon steel substrates were structurally characterized and tested in 3.5 wt.% NaCl solutions with pH values of 3.0, 5.5, and 10.0 under potentiodynamic polarization conditions. The coatings had low porosity (2.9-4.5%) and showed a predominantly amorphous structure. The concentration of an amorphous phase in the detonation coatings was 97.5-99.5 wt.%. Such high concentrations were not observed in thermally sprayed Fe-Cr-Nb-B coatings obtained by other research groups. Under the test conditions, the coatings exhibited low corrosion current densities (of the order of 10-6 A cm-2) and low passive current densities (below 10-3 A cm-2) while showing extended passive regions (stable within 1.5 V from the corrosion potential). The Fe66Cr10Nb5B19 coatings produced by DS showed a much better corrosion resistance than the carbon steel substrate. Furthermore, the corrosion resistance of the Fe66Cr10Nb5B19 DS coatings was superior to that of flame-sprayed or high-velocity oxygen fuel-sprayed Fe-Cr-Nb-B coatings reported to date. These results open new prospects for the use of affordable and Cr-lean Fe-Cr-Nb-B glassy coatings for carbon steel protection, where chloride-induced corrosion is the major degradation risk, such as metallic components for marine applications. [ABSTRACT FROM AUTHOR]

Published
2022
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