Obrabotka Metallov 2019 Vol. 21 No. 3

OBRABOTKAMETALLOV Vol. 21 No. 3 2019 126 MATERIAL SCIENCE References 1. Koneva H.A. Priroda stadii plasticheskoi deformatsii [Nature of stages of plastic deformation]. Sorosovskii obrazovatel’nyi zhurnal = Soros Educational Journal , 1998, no. 10, pp. 99–105. 2. Panin V.E., Grinyaev Yu.V., Elsukova T.F., Ivanchin A.G. Strukturnye urovni deformatsii tverdykh tel [Structural levels of deformation in solids]. Izvestiya vysshikh uchebnykh zavedenii. Fizika = Soviet Physics Journal , 1983, vol. 25, no. 6, pp. 5–27. 3. Panin V.E., Panin A.B. Fundamental’naya rol’ nanomasshtabnogo strukturnogo urovnya plasticheskoi deformatsii tverdykh tel [Fundamental role of the nanostructural level of plastic deformation in solids]. Metallovedenie i termicheskaya obrabotka metallov = Metal Science and Heat Treatment , 2006, no. 11–12, pp. 5–10. (In Russian). Structural Transformations of Carbon Ferritic-Pearlitic Steels under Conditions of High-Speed Loading Anatoly Bataev a , Ivan Bataev b , Aelita Nikulina c, * , Albert Popelyukh d , Igor Balagansky e , Natalia Plotnikova f Novosibirsk State Technical University, 20 Prospekt K. Marksa, Novosibirsk, 630073, Russian Federation а https://orcid.org/0000-0002-6227-5398, bataev@adm.nstu.ru , b https://orcid.org/0000-0003-2871-0269, i.bataev@corp.nstu.ru , c https://orcid.org/0000-0001-9249-2273, a.nikulina@corp.nstu.ru, d https://orcid.org/0000-0002-0965-3206, popelyux@corp.nstu.ru, e https://orcid.org / 0000-0002-7708-579X , balaganskij@corp.nstu.ru , f https://orcid.org/0000-0002-8005-1128 , n.plotnikova@corp.nstu.ru Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science. 2019 vol. 21 no. 3 pp. 115–128 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2019-21.3-115-128 Obrabotka metallov - Metal Working and Material Science Journal homepage: http://journals.nstu.ru/obrabotka_metallov ARTICLE INFO Article history : Received: 21 June 2019 Revised: 22 July 2019 Accepted: 15 August 2019 Available online: 15 September 2019 Keywords : Hypoeutectoid steels Explosion deformation Deformation twinning Funding The study was carried out by a grant from the Russian Science Foundation (Project No. 17–72–10226) ABSTRACT Introduction . Structure of ferritic-pearlitic steel subjected to explosive loading is investigated using the methods of light microscopy, scanning electron microscopy and transmission electron microscopy. Methods. Steel samples of various shapes and chemical composition are used for testing. Investigation materials are steel 20, 60, U7A in annealed condition. Dynamic loading of samples is performed by deformation schemes of flat plates (disks) using the phenomenon of energy focusing and tube deformation. Structural investigations are carried out by Carl Zeiss Axio Observer Z1m light microscope, EVO 50 XVP scanning electron microscope and FEI Tecnai G2 20 TWIN transmission electron microscope. Results And Discussion. The peculiarity characteristic belongs to the initial stage of deformation of the investigation materials is the twinning process, which takes place both in ferritic grains and in the colonies of lamellar pearlite. Analysis of the data obtained during transmission electron microscopy shows that the width of the twins has a great range. There are both the thin twins with a width of 10-15 nm order and the wide ones, the thickness of which is up to 100 nm. This range is observed in both ferritic grains and pearlitic colonies. Twins of deformation nature within a single colony can be represented as a set of multiple microtwins, separated by cementite plates. It is noted the through movement of twins which happened through grains of ferrite and adjacent colonies of pearlite. It indicates the unity of the ferrite matrix within these structural components. Heating of steel samples and increasing the density of twins are factors that impede the twinning process and initiate the mechanism of deformation by sliding. The change of the deformation mechanism is accompanied by the areas of curvature or even the complete degradation of the twins formed at the initial stage of loading. ______ * Corresponding author Nikulina Aelita A. , Ph.D. (Engineering), Associate Professor Novosibirsk State Technical University, 20 Prospekt K. Marksa, 630073, Novosibirsk, Russian Federation Тел. +7 (383) 346-11-71, e-mail : a.nikulina@corp.nstu.ru For citation: Bataev A.A., Bataev I.A., Nikulina A.A., Popelyukh A.I., Balagansky I.A., Plotnikova N.V. Structural transformations of carbon ferritic-pearlitic steels under conditions of high-speed loading. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science , 2019, vol. 21, no. 3, pp. 115–128. DOI: 10.17212/1994-6309-2019-21.3-115-128. (In Russian).