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Article

The Microstructure, Tensile and Impact Properties of Low-Activation Ferritic-Martensitic Steel EK-181 after High-Temperature Thermomechanical Treatment

by
Nadezhda Polekhina
1,*,
Valeria Linnik
1,
Igor Litovchenko
1,
Kseniya Almaeva
1,
Sergey Akkuzin
1,
Evgeny Moskvichev
1,
Vyacheslav Chernov
2,
Mariya Leontyeva-Smirnova
2,
Nikolay Degtyarev
2 and
Kirill Moroz
2
1
Institute of Strength Physics and Materials Science SB RAS, 2/4 Pr. Akademicheskii, 634055 Tomsk, Russia
2
JSC “A. A. Bochvar High-Technology Research Institute of Inorganic Materials”, 5 Rogov St., 123060 Moscow, Russia
*
Author to whom correspondence should be addressed.
Metals 2022, 12(11), 1928; https://doi.org/10.3390/met12111928
Submission received: 21 October 2022 / Revised: 8 November 2022 / Accepted: 9 November 2022 / Published: 10 November 2022
(This article belongs to the Special Issue Thermomechanical Treatment of Metals and Alloys)
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Abstract

In this work, we study the effect of high-temperature thermomechanical treatment (HTMT) with deformation in the austenite region on the microstructure, tensile properties, impact toughness, and fracture features of advanced low-activation 12% chromium ferritic-martensitic reactor steel EK-181. HTMT more significantly modifies the steel structural-phase state than the traditional heat treatment (THT). As a result of HTMT, the hierarchically organized structure of steel is refined. The forming grains and subgrains are elongated in the rolling direction and flattened in the rolling plane (so-called pancake structure) and have a high density of dislocations pinned by stable nanosized particles of the MX type. This microstructure provides a simultaneous increase, relative to THT, in the yield strength and impact toughness of steel EK-181 and does not practically change its ductile-brittle transition temperature. The most important reasons for the increase in impact toughness are a decrease in the effective grain size of steel (martensite blocks and ferrite grains) and the appearance of a crack-arrester type delamination perpendicular to the main crack propagation direction. This causes branching of the main crack and an increase in the absorbed impact energy.
Keywords: ferritic-martensitic steel EK-181; microstructure; mechanical properties; ductile-brittle transition temperature; impact toughness; fracture; delamination; high temperature thermomechanical treatment ferritic-martensitic steel EK-181; microstructure; mechanical properties; ductile-brittle transition temperature; impact toughness; fracture; delamination; high temperature thermomechanical treatment

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MDPI and ACS Style

Polekhina, N.; Linnik, V.; Litovchenko, I.; Almaeva, K.; Akkuzin, S.; Moskvichev, E.; Chernov, V.; Leontyeva-Smirnova, M.; Degtyarev, N.; Moroz, K. The Microstructure, Tensile and Impact Properties of Low-Activation Ferritic-Martensitic Steel EK-181 after High-Temperature Thermomechanical Treatment. Metals 2022, 12, 1928. https://doi.org/10.3390/met12111928

AMA Style

Polekhina N, Linnik V, Litovchenko I, Almaeva K, Akkuzin S, Moskvichev E, Chernov V, Leontyeva-Smirnova M, Degtyarev N, Moroz K. The Microstructure, Tensile and Impact Properties of Low-Activation Ferritic-Martensitic Steel EK-181 after High-Temperature Thermomechanical Treatment. Metals. 2022; 12(11):1928. https://doi.org/10.3390/met12111928

Chicago/Turabian Style

Polekhina, Nadezhda, Valeria Linnik, Igor Litovchenko, Kseniya Almaeva, Sergey Akkuzin, Evgeny Moskvichev, Vyacheslav Chernov, Mariya Leontyeva-Smirnova, Nikolay Degtyarev, and Kirill Moroz. 2022. "The Microstructure, Tensile and Impact Properties of Low-Activation Ferritic-Martensitic Steel EK-181 after High-Temperature Thermomechanical Treatment" Metals 12, no. 11: 1928. https://doi.org/10.3390/met12111928

APA Style

Polekhina, N., Linnik, V., Litovchenko, I., Almaeva, K., Akkuzin, S., Moskvichev, E., Chernov, V., Leontyeva-Smirnova, M., Degtyarev, N., & Moroz, K. (2022). The Microstructure, Tensile and Impact Properties of Low-Activation Ferritic-Martensitic Steel EK-181 after High-Temperature Thermomechanical Treatment. Metals, 12(11), 1928. https://doi.org/10.3390/met12111928

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