Obrabotka Metallov 2020 Vol. 22 No. 2

OBRABOTKAMETALLOV Vol. 22 No. 2 2020 101 MATERIAL SCIENCE Structure Features and Wear Resistance of Layers, formed by Ni-based Self- fl uxing Alloy combined with Boron by Electron Beam, revealed in the Air Atmosphere Tatiana Zimogliadova 1, a,* , Evdokia Bushueva 1, b , Alexandr Shtertser 2, c , Boris Grinberg 2, d , Natalia Soboleva 3, e , Eva Kollmannsberger 4, f , Ivan Chakin 5, g , Denis Bibko 5, h , Alexey Leonov 5, i , Daria Safarova 1, j 1 Novosibirsk State Technical University, 20 Prospekt K. Marksa, Novosibirsk, 630073, Russian Federation 2 Lavrentyev Institute of Hydrodynamics of the Siberian Branch of the RAS, 15 Ac. Lavrentieva ave., Novosibirsk, 630090, Russian Federation 3 Institute of Engineering Science, Ural Branch of the Russian Academy of Sciences, 34 Komsomolskaya st., 620049, Ekaterinburg, Russian Federation 4 University of Applied Sciences Landshut, 1 Am Lurzenhof, Landshut, 84036, Germany 5 Budker Institute of Nuclear Physics of Siberian Branch Russian Academy of Sciences, 11 Acad. Lavrentieva Pr., Novosibirsk, 630090, Russian Federation a https://orcid.org/0000-0002-1113-9820, zimogliadovatatiana@gmail.com , b https://orcid.org/0000-0001-7608-734X , dusias@mail.ru , c https://orcid.org/0000-0003-4973-0437, asterzer@mail.ru, d https://orcid.org/0000-0002-0160-1903, b_grinberg@mail.ru, e https://orcid.org/0000-0002-7598-2980, natashasoboleva@list.ru, f https://orcid.org/0000-0001-9489-4970, s-ekollm@haw-landshut.de , g https://orcid.org/0000-0003-0529-2017, chak_in2003@bk.ru, h https://orcid.org/0000-0002-3941-7327, denbibko@mail.ru , i https://orcid.org/0000-0001-6692-3121, Alexeyleonov2009@yandex.ru, j https://orcid.org/0000-0002-2811-8292 , safarova10ab@mail.ru Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science. 2020 vol. 22 no. 2 pp. 89–103 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2020-22.2-89-103 Obrabotka metallov - Metal Working and Material Science Journal homepage: http://journals.nstu.ru/obrabotka_metallov ARTICLE INFO Article history : Received: 16 March 2020 Revised: 14 April 2020 Accepted: 02 May 2020 Available online: 15 June 2020 Keywords : Non-vacuum electron beam cladding Ni-Cr-Si-B-alloy Structure Hardness Wear-resistance Stainless steel Funding The reported study was funded by RFBR and government of the Novosibirsk region according to the research project No. 19-43-543011. Acknowledgements The studies were performed using the equipment of the Common Use Cen- ter “Structure, mechanical and physical properties of materials” NSTU. ABSTRACT Introduction. The formation of protective layers on working surfaces of machine parts comprised of chromi- um-nickel austenitic steels is an effective way to increase its reliability and durability. Ni-base self- fl uxing alloys are widely used in order to create wear resistant coatings. The possibility of increasing the set of properties of Ni-Cr-Si-B alloys by adding reinforcing compounds to its matrix or by synthesizing reinforcing phases directly in the process of forming a protective layer is a signi fi cant interest of domestic and foreign scientists. The literature does not provide the information on the formation of protective layers on the surface of austenitic steels using cladding by relativistic electron beams of a Ni-Cr-Si-B alloy in combination with hardening additives. Aim of the current work is to increase the tribotechnical properties of the surface layers of steel workpieces via air-revealed electron beam cladding of a Ni- Cr-Si-B alloy in combination with amorphous boron taken in different weight ratios. The proportion of amorphous boron in the powder mixture is 5, 10, and 15 wt. % respectively. The structural features of the cladded layers are investigated by using the following research methods: optical metallography (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD) and electron microprobe analysis (EMPA). The properties of the surface hardened materials are determined by microhardness investigations and wear resistance during friction against fi xed abrasive particles and under conditions of hydroabrasive treatment. Results and discussion. The material produced during cladding of a Ni-Cr-Si-B alloy in combination with 15 wt. % boron is characterized by the maximum microhardness (1000 HV) and wear resistance under various wear conditions. The main structural factor providing an effective in- crease in the operational characteristics is the formation Fe2B, (Cr, Fe)B borides. It is shown that during Ni-Cr-Si-B alloy +15 wt. % boron cladding precipitation compounds are characterized by phase heterogeneity. The inner part of the two-phase complex particles is CrB2 around which (Fe, Cr)2B is released. For citation: Zimogliadova T.A., Bushueva E.G., Shtertser A.A., Grinberg B.E., Soboleva N.N., Kollmannsberger E., Chakin I.K., Bibko D.S., Leonov A.V., Safarova D.E. Structure features and wear resistance of layers, formed by Ni-based self- fl uxing alloy combined with boron by electron beam, revealed in the air atmosphere. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science , 2020, vol. 22, no. 2, pp. 89–103. DOI: 10.17212/1994-6309-2020-22.2-89-103. (In Russian). ______ * Corresponding author Zimogliadova Tatiana A., Assistant Novosibirsk State Technical University, 20 Prospekt K. Marksa, 630073, Novosibirsk, Russian Federation Tel.: +7-983-322-02-45, e-mail: zimogliadovatatiana@gmail.com