OBRABOTKAMETALLOV Vol. 26 No. 4 2024 203 MATERIAL SCIENCE The eff ect of hot plastic deformation on the structure and properties of surface-modifi ed layers after non-vacuum electron beam surfacing of a powder mixture of composition 10Cr-30B on steel 0.12 C-18 Cr-9 Ni-Ti Alina Dudareva 1, a, *, Evdokia Bushueva 1, b, Andrey Tyurin 1, c, Evgeny Domarov 2, d, Igor Nasennik 1, 4, e, Vladislav Shikalov 3, f, Ksenia Skorokhod 3, g, Alexander Legkodymov 2, 4, h 1 Novosibirsk State Technical University, 20 Prospekt K. Marksa, Novosibirsk, 630073, Russian Federation 2 Budker Institute of Nuclear Physics of Siberian Branch Russian Academy of Sciences, 11 Acad. Lavrentieva Pr., Novosibirsk, 630090, Russian Federation 3 Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, 4/1 Institutskaya str., Novosibirsk, 630090, Russian Federation 4 “Federal Research Center” G.K. Boreskov Institute of Catalysis of the Siberian Branch of the Russian Academy of Sciences”, Center for Collective Use “Siberian Ring Photo Source”, 1 Nikolsky ave., Koltsovo village, Novosibirsk region, 1630559, Russian Federation a https://orcid.org/0009-0001-5649-7090, dudareva-alina@mail.ru; b https://orcid.org/0000-0001-7608-734X, bushueva@corp.nstu.ru; c https://orcid.org/0000-0003-4757-424X, a.tyurin@corp.nstu.ru; d https://orcid.org/0000-0003-2422-1513, domarov88@mail.ru; e https://orcid.org/0000-0003-0937-5004, nasennik.2017@corp.nstu.ru; f https://orcid.org/0000-0002-0491-2803, v.shikalov@gmail.com; g https://orcid.org/0000-0003-0210-8405, k.skorokhod@itam.nsc.ru; h https://orcid.org/0000-0001-7405-7454, a_legkodymov@mail.ru Obrabotka metallov - Metal Working and Material Science Journal homepage: http://journals.nstu.ru/obrabotka_metallov Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science. 2024 vol. 26 no. 4 pp. 192–205 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2024-26.4-192-205 ART I CLE I NFO Article history: Received: 06 September 2024 Revised: 20 September 2024 Accepted: 08 October 2024 Available online: 15 December 2024 Keywords: Austenitic Ni-Cr steel Electron beam surfacing Hot plastic deformation Synchrotron radiation Boron Funding The study was carried out in accordance with the state assignment of the Ministry of Education and Science of the Russian Federation (project FSUN-2023-0009). ABSTRACT Introduction. Currently, austenitic Ni-Cr steels are widely used in the oil and gas industry for drilling wells due to its high corrosion resistance, non-magnetic properties, high impact strength, ductility and weldability. However, in order to increase the service life of products, it is necessary to increase the abrasive resistance of the surface layers while maintaining chemical resistance, which is a diffi cult technological task. The solution to such a problem can be the creation of sheet blanks “austenitic Ni-Cr steel - modifi ed layer” subjected to hot plastic deformation. The purpose of the work is to study the eff ect of hot plastic deformation on the structure and phase composition of “modifi ed layer – base metal” compositions obtained by the method of non-vacuum electron beam surfacing of a powder mixture of boron and chromium on austenitic Ni-Cr steel 0.12 C-18 Cr-9 Ni-Ti. Material and methods of research. The work investigated specimens made of steel 0.12 C-18 Cr-9 Ni-Ti with a modifi ed 10Cr-30B layer formed by non-vacuum electron beam surfacing of a powder mixture of chromium and boron, and subsequent hot plastic deformation at a temperature of 950 °C. The research methods are mechanical tests for microhardness, X-ray spectral analysis of the modifi ed layer, metallographic studies, profi le analysis, calculation of lattice parameters. Results and discussion. It is revealed that after deformation, defect-free compositions are obtained, the surface layer of which is a matrix composite material containing oriented chromium carbide particles with altered crystal lattice parameters. After plastic deformation, cracks and delamination are not recorded, which allows us to speak about the high quality of the “modifi ed layer – base metal” compositions with increased hardness values exceeding 6.5 times as-delivered steel 0.12 C-18 Cr-9 Ni-Ti (3…11 GPa and 2 GPa, respectively). In the modifi ed layer, complex borides of type (FexCry)B are formed and located in a γ-solid solution of iron. The lattice parameter decreases for γ-iron from 3.588 Å to 3.580 Å, for boride parameter a from 5.126 Å to 5.111 Å, parameter c from 4.228 Å to 4.199 Å. For citation: Dudareva A.A., Bushueva E.G., Tyurin A.G., Domarov E.V., Nasennik I.E., Shikalov V.S., Skorokhod K.A., Legkodymov A.A. The eff ect of hot plastic deformation on the structure and properties of surface-modifi ed layers after non-vacuum electron beam surfacing of a powder mixture of composition 10Cr-30B on steel 0.12 C-18 Cr-9 Ni-Ti. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science, 2024, vol. 26, no. 4, pp. 192–205. DOI: 10.17212/1994-6309-2024-26.4-192-205. (In Russian). ______ * Corresponding author Dudareva Alina A., Ph.D. (Engineering) student, Research assistant Novosibirsk State Technical University, 20 Prospekt K. Marksa, 630073, Novosibirsk, Russian Federation Tel.: +7 913 707-63-44, e-mail: dudareva-alina@mail.ru
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