The Microstructure, Tensile and Impact Properties of Low-Activation Ferritic-Martensitic Steel EK-181 after High-Temperature Thermomechanical Treatment
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...
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MDPI AG
2022-11-01
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| Online Access: | https://www.mdpi.com/2075-4701/12/11/1928 |
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| author | Nadezhda Polekhina Valeria Linnik Igor Litovchenko Kseniya Almaeva Sergey Akkuzin Evgeny Moskvichev Vyacheslav Chernov Mariya Leontyeva-Smirnova Nikolay Degtyarev Kirill Moroz |
| author_facet | Nadezhda Polekhina Valeria Linnik Igor Litovchenko Kseniya Almaeva Sergey Akkuzin Evgeny Moskvichev Vyacheslav Chernov Mariya Leontyeva-Smirnova Nikolay Degtyarev Kirill Moroz |
| author_sort | Nadezhda Polekhina |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-09T18:08:55Z |
| format | Article |
| id | doaj.art-6b3767f74c784cc99f2da94e25dfa587 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-09T18:08:55Z |
| publishDate | 2022-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-6b3767f74c784cc99f2da94e25dfa5872023-11-24T09:14:00ZengMDPI AGMetals2075-47012022-11-011211192810.3390/met12111928The Microstructure, Tensile and Impact Properties of Low-Activation Ferritic-Martensitic Steel EK-181 after High-Temperature Thermomechanical TreatmentNadezhda Polekhina0Valeria Linnik1Igor Litovchenko2Kseniya Almaeva3Sergey Akkuzin4Evgeny Moskvichev5Vyacheslav Chernov6Mariya Leontyeva-Smirnova7Nikolay Degtyarev8Kirill Moroz9Institute of Strength Physics and Materials Science SB RAS, 2/4 Pr. Akademicheskii, 634055 Tomsk, RussiaInstitute of Strength Physics and Materials Science SB RAS, 2/4 Pr. Akademicheskii, 634055 Tomsk, RussiaInstitute of Strength Physics and Materials Science SB RAS, 2/4 Pr. Akademicheskii, 634055 Tomsk, RussiaInstitute of Strength Physics and Materials Science SB RAS, 2/4 Pr. Akademicheskii, 634055 Tomsk, RussiaInstitute of Strength Physics and Materials Science SB RAS, 2/4 Pr. Akademicheskii, 634055 Tomsk, RussiaInstitute of Strength Physics and Materials Science SB RAS, 2/4 Pr. Akademicheskii, 634055 Tomsk, RussiaJSC “A. A. Bochvar High-Technology Research Institute of Inorganic Materials”, 5 Rogov St., 123060 Moscow, RussiaJSC “A. A. Bochvar High-Technology Research Institute of Inorganic Materials”, 5 Rogov St., 123060 Moscow, RussiaJSC “A. A. Bochvar High-Technology Research Institute of Inorganic Materials”, 5 Rogov St., 123060 Moscow, RussiaJSC “A. A. Bochvar High-Technology Research Institute of Inorganic Materials”, 5 Rogov St., 123060 Moscow, RussiaIn 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.https://www.mdpi.com/2075-4701/12/11/1928ferritic-martensitic steel EK-181microstructuremechanical propertiesductile-brittle transition temperatureimpact toughnessfracture |
| spellingShingle | Nadezhda Polekhina Valeria Linnik Igor Litovchenko Kseniya Almaeva Sergey Akkuzin Evgeny Moskvichev Vyacheslav Chernov Mariya Leontyeva-Smirnova Nikolay Degtyarev Kirill Moroz The Microstructure, Tensile and Impact Properties of Low-Activation Ferritic-Martensitic Steel EK-181 after High-Temperature Thermomechanical Treatment Metals ferritic-martensitic steel EK-181 microstructure mechanical properties ductile-brittle transition temperature impact toughness fracture |
| title | The Microstructure, Tensile and Impact Properties of Low-Activation Ferritic-Martensitic Steel EK-181 after High-Temperature Thermomechanical Treatment |
| title_full | The Microstructure, Tensile and Impact Properties of Low-Activation Ferritic-Martensitic Steel EK-181 after High-Temperature Thermomechanical Treatment |
| title_fullStr | The Microstructure, Tensile and Impact Properties of Low-Activation Ferritic-Martensitic Steel EK-181 after High-Temperature Thermomechanical Treatment |
| title_full_unstemmed | The Microstructure, Tensile and Impact Properties of Low-Activation Ferritic-Martensitic Steel EK-181 after High-Temperature Thermomechanical Treatment |
| title_short | The Microstructure, Tensile and Impact Properties of Low-Activation Ferritic-Martensitic Steel EK-181 after High-Temperature Thermomechanical Treatment |
| title_sort | microstructure tensile and impact properties of low activation ferritic martensitic steel ek 181 after high temperature thermomechanical treatment |
| topic | ferritic-martensitic steel EK-181 microstructure mechanical properties ductile-brittle transition temperature impact toughness fracture |
| url | https://www.mdpi.com/2075-4701/12/11/1928 |
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