Obrabotka Metallov 2018 Vol. 20 No. 2

OBRABOTKAMETALLOV Vol. 20 No. 2 2018 84 MATERIAL SCIENCE Reference 1. Suslov A.G., Blumenstein V.Yu., Gurov R.V., Gurov R.V., Isaev A.N., Odintsov L.G., Pleshakov V.V., Fe- dorov V.P., Shneider Yu.G. Tekhnologiya i instrumenty otdelochno-uprochnyayushchei obrabotki detalei poverkh- nostnym plasticheskim deformirovaniem . V 2 t. T. 1 [Technology and tools for finishing-hardening of parts by surface plastic deformation. In 2 vol. Vol. 1]. Moscow, Mashinostroenie Publ., 2014. 480 p. 2. Zuev L.B., Danilov V.I., Barannikova S.A. Plastic flow, necking and failure in metals, alloys and ceramics. Materials Science and Engineering: A , 2008, vol. 483, pp. 223–227. doi: 10.1016/j.msea.2006.11.165. 3. Zuev L.B. Autowave processes of the localization of plastic flow in active media subjected to deformation. Physics of Metals and Metallography , 2017, vol. 118, iss. 8, pp. 810–819. doi: 10.1134/S0031918X17060114. Structural Transformations in the Surface Layer During Multiradius Deforming Tool Processing Valeriy Blumenstein 1, a,* , Vladimir Kukareko 2 , b 1 Kuzbass State technical University named after T.F. Gorbachev, 28 Vesennaya st., Kemerovo, 650000, Russian Federation 2 The Joint Institute of Mechanical Engineering of the National Academy of Sciences of Belarus, 12 Academicheskaya St., Minsk, 220072, Republic of Belarus a http://orcid.org/0000-0002-3711-1535 , blumenstein@rambler.ru , b https://orcid.org/0000-0003-4283-871X , v_kukareko@mail.ru Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science. 2018 vol. 20 no. 2 pp. 75–86 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2018-20.2-75-86 ARTICLE INFO Article history : Received: 01 February 2018 Revised: 20 February 2018 Accepted: 21 March 2018 Available online: 15 June 2018 Keywords : Surface plastic deformation Multiradius tool Structure Phase composition Hardening Acknowledgements : The authors express gratitude to Ph.D. Associate Professor Makhalov M.S., Ph.D. Senior Researcher Grigo- rchic A.N. and postgraduate student Mitrofanova K.S. for assistance with experiments performance. ABSTRACT Objective is to expand the technological possibilities of the process of hardening by surface plastic deforma- tion (SPD) through the use of a multiradius roller (MP), creating a large hydrostatic pressure in the deformation zone. Materials and methods of investigation . Experimental ring samples  60 mm were made from annealed steel 45 GOST 1050-88 taken from one delivery. The hardness of the steel was 190 HV 10. The mechanical processing involved roughing and finishing turning with small allowances of 0.25 and 0.15 mm, respectively, with the feed of 0.07 mm/cycle and a spindle speed of 1600 cycle/min was made. Next, preliminary and final grinding was carried out by the means of abrasive paper with a small grain size. This processing made it possible to exclude the influence of roughness and defective layer on the quality of the processed surface of a part. Surface plastic deformation (SPD) by a MR roller  60 mm was carried out on a turning lathe using a special roller unit in two working modes, differing in the rolling force. The MP roll had the shape of a working surface profile in the form of a combination of succes- sively located deforming elements (DE) with radii of constant magnitude disposed relative to each other with some displacement in the radial and axial directions. Results and discussions. It is established that the processing with a MR roller results in a substantial increase in the defects density of the crystal lattice in the surface layer, an increase in its microhardness approximately in two times and also in the deformation-induced dissolution of cementite particles Fe 3 C. It is shown that an increase in the rolling force of steel by means of a MR roller ensures deeper dissolution of cementite particles in the deformed surface layer and intensifies its hardening. For citation: Blumenshtein V.Yu., Kukareko V.A. Structural transformations in the surface layer during multiradius deforming tool processing. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science , 2018, vol. 20, no. 2, pp. 75–86. doi: 10.17212/1994-6309-2018-20.2-75-86. (In Russian). ______ * Corresponding author Blumenstein Valeriy Yu. , D.Sc. (Engineering), Professor, Kuzbass State technical University named after T.F. Gorbachev, 28 Vesennaya st., Kemerovo, 650000, Russian Federation Тел.: 8 (3842) 39-63-75, e-mail: blumenstein@rambler.ru Obrabotka metallov - Metal Working and Material Science Journal homepage: http://journals.nstu.ru/obrabotka_metallov