The effect of plastic deformation temperature on the microstructure and mechanical properties of EK-164 austenitic steel
Chromium-nickel austenitic EK-164 steel has good ductility, corrosion resistance, and effective resistance to radiation swelling in comparison with other steels of this class. Currently, due to these properties, EK-164 steel is used as one of the main materials for the production of shells of fuel elements of reactors. The construction of new fast-neutron reactors (BN-1200, etc.) requires the improvement (strength improvement) of existing nuclear power engineering materials. The paper studies the effect of plastic deformation temperature on the features of microstructure and mechanical properties of EK-164 austenitic steel. The authors proposed the technique of modification of microstructure and mechanical properties of austenitic steel using plastic deformation at various temperatures, determined the features of microstructure and mechanisms of deformation ensuring the improvement of strength properties of steel under the draw. The study showed that during cold deformation ε≈30 %, mechanical twinning (mainly by two systems) develops in the steel microstructure. The authors did not identify the formation of martensite phases in the twins’ intersections that proves the stability of austenite against the phase transformations in the process of deformation of the selected steel. Low-temperature deformation with pre-cooling in liquid nitrogen ε≈50 % leads to more intense twinning (twins by several systems) and contributes to the development of localized deformation in the micro-twin structure. In this case, the localized deformation develops mainly in places with a high density of micro-twins. In the process of warm deformation at 600 °C, ε≈60 %, the original austenite grains are fragmented with the formation of the distorted submicrocrystalline plates, which have both the low-angle and large-angle boundaries of disorientation. The structural states obtained as a result of plastic deformation provide a significant (≈2–5 times) increase in the strength properties of steel.
Sabirov I., Enikeev N.A., Murashkin M.Yu., Valiev R.Z. Bulk nanostructured materials with multifunctional properties. Luxembourg, Springer, 2015. 118 p.
Krawczynska A.T., Suchecki P., Adamczyk-Cieslak B., Romelczyk-Baishya B., Lewandowska M. Influence of high hydrostatic pressure annealing on the recrystallization of nanostructured austenitic stainless steel. Materials Science and Engineering A, 2019, vol. 767, p. 138381.
Dobatkin S.V., Rybalchenko O.V., Enikeev N.A., Tokar A.A., Abramova M.M. Formation of fully austenitic ultrafine-grained high strength state in metastable Cr–Ni–Ti stainless steel by severe plastic deformation. Materials Letters, 2016, vol. 166, pp. 276–279.
Odnobokova M., Belyakov A., Kaibyshev R. Grain refinement and strengthening of austenitic stainless steels during large strain cold rolling. Philosophical Magazine, 2019, vol. 99, pp. 531–556.
Shen Y.F., Jia N., Wang Y.D., Sun X., Zuo L., Raabe D. Suppression of twinning and phase transformation in an ultrafine grained 2 GPa strong metastable austenitic steel: Experiment and simulation. Acta Materialia, 2015, vol. 97, pp. 305–315.
Maier G.G., Astafurova E.G., Melnikov E.V., Mydenkin E.V., Smirnov A.I., Bataev V.A., Odessky P.D., Dobatkin S.V. Evolution of grain-subgrain structure and carbide subsystem upon annealing of a low-carbon low-alloy steel subjected to high-pressure torsion. The Physics of Metals and Metallography, 2016, vol. 117, no. 11, pp. 1101–1110.
Litovchenko I.Y., Tyumentsev A.N., Akkuzin S.A., Naiden E.P., Korznikov A.V. Martensitic transformations and the evolution of the defect microstructure of metastable austenitic steel during severe plastic deformation by high-pressure torsion. The Physics of Metals and Metallography, 2016, vol. 117, no. 8, pp. 875–884.
Levina A.V., Mal’tseva L.A., Arkhangel’skaya A.A., Loginov Yu.N., Ozerets N.N., Mal’tseva T.V. Effect of shear deformation at high pressure on austenitic-ferritic steel 03Kh13N10K5M2Yu2T structure and properties. Metal Science and Heat Treatment, 2015, vol. 57, no. 5-6, pp. 320–328.
Rybin V.V. Bolshie plasticheskie deformatsii i razrushenie metallov [Large plastic deformation and destruction of metals]. Moscow, Metallurgiya Publ., 1986, 224 с.
Misra R.D.K., Zhang Z., Venkatasurya P.K.C., Somani M.C., Karjalainen L.P. Martensite shear phase reversion-induced nanograined/ultrafine-grained Fe–16Cr–10Ni alloy: The effect of interstitial alloying elements and degree of austenite stability on phase reversion. Materials Science and Engineering A, 2010, vol. 527, pp. 7779–7792.
Li J., Cao Y., Gao B., Li Y., Zhu Y. Superior strength and ductility of 316L stainless steel with heterogeneous lamella structure. Journal of Materials Science, 2018, vol. 53, pp. 10442–10456.
Gong N., Wu H., Niu G., Cao J., Zhang D., Tana. Effect of martensitic transformation on nano/ultrafine-grained structure in 304 austenitic stainless steel. Journal of Iron and Steel Research International, 2017, vol. 24, no. 12, pp. 1231–1237.
Rajasekhara S., Karjalainen L.P., Kyröläinen A., Ferreira P.J. Microstructure evolution in nano/submicron grained AISI 301LN stainless steel. Materials Science and Engineering A, 2010, vol. 527, no. 7-8, pp. 1986–1996.
Ravi KumarB., Sharma S., Kashyap B.P., Prabhu N. Ultrafine grained microstructure tailoring in austenitic stainless steel. Materials and Design, 2015, vol. 68, pp. 63–71.
Akkuzin S.A., Litovchenko I.Yu., Tyumentsev A.N., Chernov V.M. Microstructure and Mechanical Properties of Austenitic Steel EK-164 After Thermomechanical Treatment. Russian Physics Journal, 2019, vol. 62, no. 4, pp. 698–704.
Ditenberg I.A., Tyumentsev A.N., Smirnov I.V., Grinyaev K.V., Chernov V.M. Thermal stability of nanostructured internally oxidized vanadium alloy with combined dispersion and substructural hardening. Physical Mesomechanics, 2019, vol. 22, no. 6, pp. 496–503.
Portnykh I.A., Kozlov A.V., Panchenko V.L., Mitrofanova N.M. Characteristics of radiation porosity formed upon irradiation in a BN-600 reactor in the fuel-element cans of cold-deformed steel EK-164 (06Kh16N20М2G2BTFR)-ID c.d. The Physics of Metals and Metallography, 2012, vol. 113, no. 5, pp. 520–531.
Litovchenko I.V., Polekhina N.A., Tyumentsev A.N., Naiden E.P., Akkuzin S.A. The Features of Microstructure and Mechanical Properties of Metastable Austenitic Steel Subjected to Low-Temperature and Subsequent Warm Deformation. Russian Physics Journal, 2016, vol. 59, no. 6, pp. 782–787.
Wang T.S., Peng J.G., Gao Y.W., Zhang F.C., Jing T.F. Microstructure of 1Cr18Ni9Ti stainless steel by cryogenic compression deformation and annealing. Materials Science and Engineering A, 2005, vol. 407, no. 1-2, pp. 84–88.
Litovchenko I.Yu., Tumentsev A.N., Shevchenko N.V., Korznikov A.V. Evolution of structural and phase states at large plastic deformations of an austenitic steel 17Cr–14Ni–2Mo. The Physics of Metals and Metallography, 2011, vol. 112, no. 4, pp. 412–423.
The authors who publish their manuscripts in “Vektor Nauki of Togliatti State University” Journal agree that:
- When submitting a manuscript to the Editors of “Vektor Nauki of Togliatti State University” Journal, the author accepts that the Editors have the exclusive property rights for the paper use (material submitted to the Editors including such protected by the copyright law objects as figures, charts, tables, etc.), including the rights for reproduction in print and on the Internet; distribution; translation of the materials into English.
- The author guarantees that (s)he has exclusive copyright for the material submitted to the Editors. Shall this guarantee be violated and shall the Editors receive any complaints or claims as a result, the Author shall settle all claims and complaints at his/her own and at his/her expense. The Editors shall not be held liable to a third party for violation of the guarantees given by the Author.
- The Author shall retain the right to use his/her published material, its fragments and paragraphs for personal and teaching purposes. Copying the materials published in the journal can only be allowed to other individuals or legal entities by a written consent from the Editors with a reference to the particular issue (year of publishing) in which the material was published.