Peculiarities of the Creep Behavior of 15Kh2NMFAA Vessel Steel at High Temperatures
The creep properties of 15Kh2NMFAA nuclear WWER (water–water energetic reactor) vessel steel in the range of 500–1200 °C temperatures, which may appear during severe nuclear reactor accidents, were investigated. The present paper attempts to analyze the creep curves obtained from tensile testing at...
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2025-05-01
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| author | Egor Terentyev Artem Marchenkov Vladimir Loktionov Anastasia Pankina Georgy Sviridov Ksenia Borodavkina Danila Chuprin Nikita Lavrik |
| author_facet | Egor Terentyev Artem Marchenkov Vladimir Loktionov Anastasia Pankina Georgy Sviridov Ksenia Borodavkina Danila Chuprin Nikita Lavrik |
| author_sort | Egor Terentyev |
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| description | The creep properties of 15Kh2NMFAA nuclear WWER (water–water energetic reactor) vessel steel in the range of 500–1200 °C temperatures, which may appear during severe nuclear reactor accidents, were investigated. The present paper attempts to analyze the creep curves obtained from tensile testing at high temperatures using the Larson–Miller parametric technique. The power law rate and material coefficient of Norton’s equation with the Monkman–Grant relationship coefficient were found for each test temperature. It is shown that in accordance with the Monkman–Grant relationship coefficient values, changing the creep type from dislocation glide to high temperature dislocation climb occurs in the temperature range of 600–700 °C, which leads to a slope change in the Larson–Miller parameter plot and the conversion of steel creep behavior. It is also shown that in the range of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>A</mi><mn>1</mn></msub></semantics></math></inline-formula>–<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>A</mi><mn>3</mn></msub></semantics></math></inline-formula> temperatures, a stepwise change in creep characteristics occurs, which is associated with phase transformations. In addition, the constancy of the product of the time to rupture <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>τ</mi><mi>r</mi></msub></semantics></math></inline-formula> and the minimum creep rate <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mover accent="true"><mi>ϵ</mi><mo>˙</mo></mover><mrow><mi>m</mi><mi>i</mi><mi>n</mi></mrow></msub></semantics></math></inline-formula> in the ranges of 600–700 °C and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>A</mi><mn>3</mn></msub></semantics></math></inline-formula>—1200 °C was noted. The proposed approach improves the accuracy of time to rupture estimation of 15Kh2NMFAA steel by at least one order of magnitude. Based on the research results, the calculated dependence of the steel’s long-term strength limit on temperature was obtained for several time bases, allowing us to increase the accuracy of material survivability prediction in the case of a severe accident at a nuclear reactor. |
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| spelling | doaj-art-9484c3493b3d415cbc7f856ba4d317412025-08-20T03:16:22ZengMDPI AGMetals2075-47012025-05-0115657110.3390/met15060571Peculiarities of the Creep Behavior of 15Kh2NMFAA Vessel Steel at High TemperaturesEgor Terentyev0Artem Marchenkov1Vladimir Loktionov2Anastasia Pankina3Georgy Sviridov4Ksenia Borodavkina5Danila Chuprin6Nikita Lavrik7National Research University Moscow Power Engineering Institute, 14/1, Krasnokazarmennaya Street, 111250 Moscow, RussiaNational Research University Moscow Power Engineering Institute, 14/1, Krasnokazarmennaya Street, 111250 Moscow, RussiaNational Research University Moscow Power Engineering Institute, 14/1, Krasnokazarmennaya Street, 111250 Moscow, RussiaNational Research University Moscow Power Engineering Institute, 14/1, Krasnokazarmennaya Street, 111250 Moscow, RussiaNational Research University Moscow Power Engineering Institute, 14/1, Krasnokazarmennaya Street, 111250 Moscow, RussiaNational Research University Moscow Power Engineering Institute, 14/1, Krasnokazarmennaya Street, 111250 Moscow, RussiaNational Research University Moscow Power Engineering Institute, 14/1, Krasnokazarmennaya Street, 111250 Moscow, RussiaNational Research University Moscow Power Engineering Institute, 14/1, Krasnokazarmennaya Street, 111250 Moscow, RussiaThe creep properties of 15Kh2NMFAA nuclear WWER (water–water energetic reactor) vessel steel in the range of 500–1200 °C temperatures, which may appear during severe nuclear reactor accidents, were investigated. The present paper attempts to analyze the creep curves obtained from tensile testing at high temperatures using the Larson–Miller parametric technique. The power law rate and material coefficient of Norton’s equation with the Monkman–Grant relationship coefficient were found for each test temperature. It is shown that in accordance with the Monkman–Grant relationship coefficient values, changing the creep type from dislocation glide to high temperature dislocation climb occurs in the temperature range of 600–700 °C, which leads to a slope change in the Larson–Miller parameter plot and the conversion of steel creep behavior. It is also shown that in the range of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>A</mi><mn>1</mn></msub></semantics></math></inline-formula>–<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>A</mi><mn>3</mn></msub></semantics></math></inline-formula> temperatures, a stepwise change in creep characteristics occurs, which is associated with phase transformations. In addition, the constancy of the product of the time to rupture <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>τ</mi><mi>r</mi></msub></semantics></math></inline-formula> and the minimum creep rate <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mover accent="true"><mi>ϵ</mi><mo>˙</mo></mover><mrow><mi>m</mi><mi>i</mi><mi>n</mi></mrow></msub></semantics></math></inline-formula> in the ranges of 600–700 °C and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>A</mi><mn>3</mn></msub></semantics></math></inline-formula>—1200 °C was noted. The proposed approach improves the accuracy of time to rupture estimation of 15Kh2NMFAA steel by at least one order of magnitude. Based on the research results, the calculated dependence of the steel’s long-term strength limit on temperature was obtained for several time bases, allowing us to increase the accuracy of material survivability prediction in the case of a severe accident at a nuclear reactor.https://www.mdpi.com/2075-4701/15/6/57115Kh2NMFAA steelcreepmicrostructureLarson–Miller parameterMonkman–Grant relationshiplong-term strength limit |
| spellingShingle | Egor Terentyev Artem Marchenkov Vladimir Loktionov Anastasia Pankina Georgy Sviridov Ksenia Borodavkina Danila Chuprin Nikita Lavrik Peculiarities of the Creep Behavior of 15Kh2NMFAA Vessel Steel at High Temperatures Metals 15Kh2NMFAA steel creep microstructure Larson–Miller parameter Monkman–Grant relationship long-term strength limit |
| title | Peculiarities of the Creep Behavior of 15Kh2NMFAA Vessel Steel at High Temperatures |
| title_full | Peculiarities of the Creep Behavior of 15Kh2NMFAA Vessel Steel at High Temperatures |
| title_fullStr | Peculiarities of the Creep Behavior of 15Kh2NMFAA Vessel Steel at High Temperatures |
| title_full_unstemmed | Peculiarities of the Creep Behavior of 15Kh2NMFAA Vessel Steel at High Temperatures |
| title_short | Peculiarities of the Creep Behavior of 15Kh2NMFAA Vessel Steel at High Temperatures |
| title_sort | peculiarities of the creep behavior of 15kh2nmfaa vessel steel at high temperatures |
| topic | 15Kh2NMFAA steel creep microstructure Larson–Miller parameter Monkman–Grant relationship long-term strength limit |
| url | https://www.mdpi.com/2075-4701/15/6/571 |
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