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Structure formation of nitrogen-containing austenitic 04Kh20N6G11M2AFB steel. Part 2: Influence of the phase composition and hot deformation conditions on the process of dynamic recrystallization
https://doi.org/10.22349/1994-6716-2018-94-2-00-00
Abstract
The effect of δ-ferrite in high-strength corrosion-resistant nitrogen-containing steel of 04Kh20N6G11M2AFB grade on deformation resistance during hot deformation in the temperature range of 900–1200°С and strain rates of 0.1–10 s-1 has been investigated. Analysis of diagrams shows that dynamic recrystallization of δ-ferrite steel starts at a lower threshold deformation rate comparing 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 have been determined. After structure complex analysis, it was established that δ-ferrite promotes the nucleation and development of dynamic recrystallization at temperature 1200–1000°C (starting at the lowest deformation threshold), and recrystallized structure forms in the larger volume range than in purely austenitic steel.
Keywords
nitrogen-containing austenitic steel,
δ-ferrite,
structure,
dynamic recrystallization,
hot deformation,
strain rate,
deformation resistance
Supporting agencies: Experimental studies were performed on the equipment of the laboratory of the Test and Technical Complex of Irradiated and Radionuclide Materials and the Center for Collective Use “Composition, Structure and Properties of Structural and Functional Materials” of the NRC “Kurchatov Institute” – CRISM “Prometey with financial support of the Ministry of Education and Science of Russian Federation within the framework of the agreement 14.595.21.0004, unique identifier RFMEFI59517X0004.
About the Authors
O. V. Fomina
NRC “Kurchatov Institute” – Central Research Institute of Structural Materials “Prometey”
Russian Federation
Russian Federation
Cand. Sci (Eng)
49, Shpalernaya St., 191015, St Petersburg
T. V. Vikhareva
NRC “Kurchatov Institute” – Central Research Institute of Structural Materials “Prometey”
Russian Federation
49, Shpalernaya St., 191015, St Petersburg, Russian Federation
Russian Federation
49, Shpalernaya St., 191015, St Petersburg, Russian Federation
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Review
For citations:
Fomina O.V., Vikhareva T.V. Structure formation of nitrogen-containing austenitic 04Kh20N6G11M2AFB steel. Part 2: Influence of the phase composition and hot deformation conditions on the process of dynamic recrystallization. Voprosy Materialovedeniya. 2018;(2(94)):22-29. (In Russ.) https://doi.org/10.22349/1994-6716-2018-94-2-00-00
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