OBRABOTKAMETALLOV Vol. 27 No. 2 2025 203 MATERIAL SCIENCE References 1. Lo K.H., Shek C.H., Lai J.K.L. Recent developments in stainless steels. Materials Science and Engineering: R: Reports, 2009, vol. 65 (4–6), pp. 39–104. DOI: 10.1016/j.mser.2009.03.001. Eff ect of heterogeneous structure on mechanical behavior of austenitic stainless steel subjected to novel thermomechanical processing Ruslan Chernichenko 1, a,*, Dmitrii Panov 1, b, Stanislav Naumov 1, s, Egor Kudryavtsev 1, d, Gennady Salishchev 1, e, Alexey Pertsev 2, f 1 Belgorod National Research University, 85 Pobedy Str., Belgorod, 308015, Russian Federation 2 Department Chief Metallurgist, Perm Scientifi c-Research Technological Institute, 41 Geroev Khasana Str., Perm, 614990, Russian Federation a https://orcid.org/0000-0002-8619-0700, rus.chernichenko@mail.ru; b https://orcid.org/0000-0002-8971-1268, dimmak-panov@mail.ru; c https://orcid.org/0000-0002-4084-8861, NaumovStanislav@yandex.ru; d https://orcid.org/0000-0003-1113-0807, kudryavtsev@bsuedu.ru; e https://orcid.org/0000-0002-0815-3525, salishchev_g@bsuedu.ru; f https://orcid.org/0009-0009-0771-9345, perets_87@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. 2025 vol. 27 no. 2 pp. 189–205 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2025-27.2-189-205 ART I CLE I NFO Article history: Received: 17 February 2025 Revised: 05 March 2025 Accepted: 21 March 2025 Available online: 15 June 2025 Keywords: Austenitic stainless steel Heterogeneous structure Axial texture Shear texture Cold radial forging Heat treatment Strength Ductility Funding This work was supported by the Russian Science Foundation (Agreement No. 20-79-10094) using the equipment of BSU Shared Research Facilities “Technologies and Materials”. ABSTRACT Introduction. The low yield strength of austenitic stainless steels is a factor signifi cantly limiting their industrial applications. In turn, the formation of a heterogeneous structure is a promising method for achieving a synergy of mechanical properties. At the same time, an eff ective way to obtain a bulk heterogeneous structure is cold radial forging. However, the underlying mechanisms for the improved mechanical properties of materials with a heterogeneous structure formed in the process of cold radial forging are currently poorly understood. Purpose of the work is to investigate the eff ect of a heterogeneous structure obtained by deformation and heat treatment on the mechanical properties of austenitic stainless steel 0.08 C-17 Cr-13 Ni-2 Mn-Ti. Methods. Uniaxial tensile tests were performed on specimens obtained by cold radial forging followed by heat treatment at 600–700°C, using an Instron 5882 testing machine at room temperature with a strain rate of 1.15 × 10–3 s–1. A VIC-3D visual inspection system was used to measure elongation during testing. The fi ne structure was examined on perforated foils with a diameter of 3 mm using a JEOL JEM-2100 transmission electron microscope at an accelerating voltage of 200 kV. Results and discussion. It was shown that, after thermo-mechanical treatment, a twin-matrix austenite structure was obtained in the center of the rod, while an ultrafi ne-grained structure with isolated recrystallized austenite grains of approximately 1 μm in size was obtained at the edge. It was established that a two-component axial austenite texture <001>/<111> is formed in the center of the rod, which transformed into a shear texture B/B̅ towards the rod surface. It was determined that the formation of a heterogeneous structure led to additional strengthening due to back stresses. It was found that, after heat treatment at 700 °C, the specimen with a heterogeneous structure exhibited the highest yield strength, equal to 1054 MPa, with a relative elongation of 16%. Thus, the employed thermo-mechanical treatment may be a promising method for obtaining large-sized rod stocks from austenitic stainless steel 0.08 C-17 Cr-13 Ni-2 Mn-Ti with high mechanical properties. For citation: Chernichenko R.S., Panov D.O., Naumov S.V., Kudryavtsev E.A., Salishchev G.A., PertsevA.S. Eff ect of heterogeneous structure on mechanical behavior of austenitic stainless steel subjected to novel thermomechanical processing. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science, 2025, vol. 27, no. 2, pp. 189–205. DOI: 10.17212/1994-6309-2025-27.2189-205. (In Russian). ______ * Corresponding author Chernichenko Ruslan S., Research assistant Belgorod National Research University, 85 Pobedy Str., 308015, Belgorod, Russian Federation Tel.: +7 905 172-05-92, e-mail: rus.chernichenko@mail.ru
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