Structure Formation of the Nitrogen-Containing Austenitic 04Kh20N6G11M2AFB Steel at Hot Deformation: Part II. Influence of the Phase Composition and Conditions of Hot Deformation on the Process of Dynamic Recrystallization
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The impact of δ-ferrite in high-strength corrosion-resistant nitrogen-containing 04Kh20N6G11M2AFB steel on deformation resistance during hot deformation within the temperature range of 900–1200°С and strain rates of 0.1–10 s–1 was investigated. Analysis of diagrams shows that dynamic recrystallization of δ-ferrite steel starts at a lower threshold deformation rate compared with pure austenitic steel. The values of the deformation threshold necessary for the initiation and development of dynamic recrystallization depending on the phase composition of the nitrogen-containing steel were determined. The complex analysis of the structure proved that δ-ferrite contributes to the nucleation and development of dynamic recrystallization at 1200–1000°C (its initiation corresponds to the lowest deformation threshold) and formation of the recrystallized structure in a larger volume as compared with the purely austenitic structure.
Keywords:nitrogen-containing austenitic steel δ-ferrite structure dynamic recrystallization hot deformation strain rate deformation resistance
Experimental studies were performed by using the equipment of the Center for Collective Use Composition, Structure, and Properties of Structural and Functional Materials of the National Research Center Kurchatov Institute—CRISM Prometey under the financial support of the Ministry of Education within the framework of agreement 14.595.21.0004, unique identifier RFMEFI59517X0004.
- 1.Kalinin, G.Yu., Mushnikova, S.Yu., Nesterova, E.V., Fomina, O.V., and Khar’kov, A.A., The structure and properties of high-strength corrosion-resistant nitrogen steel 04Kh20N6G11M2AFB, Vopr. Materialoved., 2006, no. 1 (45), pp. 45–53.Google Scholar
- 2.Malyshevsky, V.A., Tsukanov, V.V., Kalinin, G.Yu., and Fomina, O.V., Modern low-magnetic steels for shipbuilding, Sudostroenie, 2009, no. 5, pp. 19–21.Google Scholar
- 3.Gorynin, I.V., Rybin, V.V., Malyshevsky, V.A., Kalinin, G.Yu., Mushnikova, S.Yu., Malakhov, N.V., and Yampol’skii, V.D., Creation of prospective fundamentally new corrosion-resistant cored steels doped with nitrogen, Vopr. Materialoved., 2005, no. 2 (42), pp. 40–54.Google Scholar
- 4.Gorynin, I.V., Malyshevsky, V.A., Kalinin, G.Yu., Mushnikova, S.Yu., Bannykh, O.A., Blinov, V.M., and Kostina, M.V., Corrosion-resistant high-strength nitro-genous steels, Vopr. Materialoved., 2009, no. 3 (59), pp. 7–16.Google Scholar
- 7.Kane, R.H., The Hot Deformation of Austenite, Oxford: Pergamon, 1977.Google Scholar
- 8.Pickering, F.B., Physical Metallurgy and the Design of Steels, London: Appl. Sci., 1978.Google Scholar
- 9.Livshits, L.S., Metallovedenie dlya svarshchikov (Metal Science for Welders), Moscow: Mashinostroenie, 1979.Google Scholar
- 10.Demk, H., Deformation under Hot Working Conditions, London: Iron Steel Inst., 1968.Google Scholar
- 11.Sokol, I.Ya., Dvukhfaznye stali (Two-Phase Steels), Moscow: Metallurgiya, 1974.Google Scholar
- 12.Fomina, O.V., Vikhareva, T.V., Sagaradze, V.V., and Kataeva, N.V., Structure formation of the nitrogen-containing austenitic 04Kh20N6G11M2AFB steel at hot deformation: Part I. influence of deformation temperature and strain rate on the process of dynamic recrystallization, Inorg. Mater.: Appl. Res., 2018, vol. 9, no. 6, pp. 1060–1069.Google Scholar