Thermal resistance of steels with increased strength properties for pressure vessels of advanced VVER reactors of various designs
The paper considers the results of structural studies and mechanical tests after a long-term thermal exposure of laboratory heats of the metallurgically improved 15Kh2NMFA steel and steel with an increased content of nickel considered as materials for the pressure vessels of advanced VVER-type react...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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National Research Nuclear University (MEPhI)
2023-10-01
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| Series: | Nuclear Energy and Technology |
| Online Access: | https://nucet.pensoft.net/article/113715/download/pdf/ |
| _version_ | 1797653637585960960 |
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| author | Evgenia A. Kuleshova Ivan V. Fedotov Dmitry A. Maltsev Margarita G. Isaenkova Olga A. Krymskaya Roman A. Minushkin |
| author_facet | Evgenia A. Kuleshova Ivan V. Fedotov Dmitry A. Maltsev Margarita G. Isaenkova Olga A. Krymskaya Roman A. Minushkin |
| author_sort | Evgenia A. Kuleshova |
| collection | DOAJ |
| description | The paper considers the results of structural studies and mechanical tests after a long-term thermal exposure of laboratory heats of the metallurgically improved 15Kh2NMFA steel and steel with an increased content of nickel considered as materials for the pressure vessels of advanced VVER-type reactors of various designs. It has been shown that, both for the improved 15Kh2NMFA steel and the high-nickel steel, there are no signs of grain boundary embrittlement after an segregation provoking embrittlement heat treatment. This is explained by the extremely low grain boundary segregation of phosphorus in the initial state caused by a high degree of the structure dispersity as well as by rather a low content of impurities. Besides, no changes have been found in the yield strength value for the improved 15Kh2NMFA steel, which agrees with the structure investigation results. For the high-nickel steel, a tendency towards a minor yield strength decrease by 5 to 10% and a regular reduction of the critical brittleness temperature has been revealed. A decrease in the mechanical properties has been caused by a relatively low temperature of tempering for the high-nickel steel and, accordingly, by the potential occurrence of the structure recovery during long-term thermal exposure, as evidenced by the results of an X-ray diffraction analysis. Despite the structure recovery in the high-nickel steel under the long-term thermal exposure, the main strengthening carbide phases remain stable. Due to this, the yield strength value remains at a relatively high level that exceeds the values for the modern VVER-type vessel steels, even in the case of a thermal exposure much in excess of the expected operating conditions for advanced VVER reactors. The observed decrease of critical brittleness temperature during the long-term thermal exposure contributes to an increase in the steel resistance to brittle fracture. |
| first_indexed | 2024-03-11T16:47:27Z |
| format | Article |
| id | doaj.art-aaf1c96766fa4df1bf3ae04c31929bff |
| institution | Directory Open Access Journal |
| issn | 2452-3038 |
| language | English |
| last_indexed | 2024-03-11T16:47:27Z |
| publishDate | 2023-10-01 |
| publisher | National Research Nuclear University (MEPhI) |
| record_format | Article |
| series | Nuclear Energy and Technology |
| spelling | doaj.art-aaf1c96766fa4df1bf3ae04c31929bff2023-10-22T08:11:08ZengNational Research Nuclear University (MEPhI)Nuclear Energy and Technology2452-30382023-10-019319720310.3897/nucet.9.113715113715Thermal resistance of steels with increased strength properties for pressure vessels of advanced VVER reactors of various designsEvgenia A. Kuleshova0Ivan V. Fedotov1Dmitry A. Maltsev2Margarita G. Isaenkova3Olga A. Krymskaya4Roman A. Minushkin5National Research Centre Kurchatov InstituteNational Research Centre Kurchatov InstituteNational Research Centre Kurchatov InstituteNational Research Nuclear University “MEPhI”National Research Nuclear University “MEPhI”National Research Nuclear University “MEPhI”The paper considers the results of structural studies and mechanical tests after a long-term thermal exposure of laboratory heats of the metallurgically improved 15Kh2NMFA steel and steel with an increased content of nickel considered as materials for the pressure vessels of advanced VVER-type reactors of various designs. It has been shown that, both for the improved 15Kh2NMFA steel and the high-nickel steel, there are no signs of grain boundary embrittlement after an segregation provoking embrittlement heat treatment. This is explained by the extremely low grain boundary segregation of phosphorus in the initial state caused by a high degree of the structure dispersity as well as by rather a low content of impurities. Besides, no changes have been found in the yield strength value for the improved 15Kh2NMFA steel, which agrees with the structure investigation results. For the high-nickel steel, a tendency towards a minor yield strength decrease by 5 to 10% and a regular reduction of the critical brittleness temperature has been revealed. A decrease in the mechanical properties has been caused by a relatively low temperature of tempering for the high-nickel steel and, accordingly, by the potential occurrence of the structure recovery during long-term thermal exposure, as evidenced by the results of an X-ray diffraction analysis. Despite the structure recovery in the high-nickel steel under the long-term thermal exposure, the main strengthening carbide phases remain stable. Due to this, the yield strength value remains at a relatively high level that exceeds the values for the modern VVER-type vessel steels, even in the case of a thermal exposure much in excess of the expected operating conditions for advanced VVER reactors. The observed decrease of critical brittleness temperature during the long-term thermal exposure contributes to an increase in the steel resistance to brittle fracture.https://nucet.pensoft.net/article/113715/download/pdf/ |
| spellingShingle | Evgenia A. Kuleshova Ivan V. Fedotov Dmitry A. Maltsev Margarita G. Isaenkova Olga A. Krymskaya Roman A. Minushkin Thermal resistance of steels with increased strength properties for pressure vessels of advanced VVER reactors of various designs Nuclear Energy and Technology |
| title | Thermal resistance of steels with increased strength properties for pressure vessels of advanced VVER reactors of various designs |
| title_full | Thermal resistance of steels with increased strength properties for pressure vessels of advanced VVER reactors of various designs |
| title_fullStr | Thermal resistance of steels with increased strength properties for pressure vessels of advanced VVER reactors of various designs |
| title_full_unstemmed | Thermal resistance of steels with increased strength properties for pressure vessels of advanced VVER reactors of various designs |
| title_short | Thermal resistance of steels with increased strength properties for pressure vessels of advanced VVER reactors of various designs |
| title_sort | thermal resistance of steels with increased strength properties for pressure vessels of advanced vver reactors of various designs |
| url | https://nucet.pensoft.net/article/113715/download/pdf/ |
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