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Thermal resistance of steels with increased strength properties for pressure vessels of advanced VVER reactors of various designs

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creativeworkseries.issn2452-3038
dc.contributor.authorMaltsev, D. A.
dc.contributor.authorИсаенкова, Маргарита Геннадьевна
dc.contributor.authorКрымская, Ольга Александровна
dc.contributor.authorФедотов, Иван Владимирович
dc.contributor.authorКулешова, Евгения Анатольевна
dc.contributor.authorМинушкин, Роман Александрович
dc.contributor.authorKuleshova, E. A.
dc.contributor.authorFedotov, I. V.
dc.contributor.authorIsaenkova, M. G.
dc.contributor.authorKrymskaya, O. A.
dc.contributor.authorMinushkin, R. A.
dc.date.accessioned2023-11-01T07:39:30Z
dc.date.available2023-11-01T07:39:30Z
dc.date.issued2023
dc.description.abstractThe 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.
dc.identifier.citationKuleshova EA, Fedotov IV, Maltsev DA, Isaenkova MG, Krymskaya OA, Minushkin RA (2023) Thermal resistance of steels with increased strength properties for pressure vessels of advanced VVER reactors of various designs. Nuclear Energy and Technology 9(3): 197-203. https://doi.org/10.3897/nucet.9.113715
dc.identifier.doi10.3897/nucet.9.113715
dc.identifier.issn2452-3038
dc.identifier.urihttps://openrepository.mephi.ru/handle/123456789/1140
dc.identifier.urihttps://doi.org/10.3897/nucet.9.113715
dc.relation.ispartofNuclear Energy and Technology
dc.subjectthermal resistance
dc.subjecttemper brittleness
dc.subjectstructure parameters
dc.subjectmechanical properties
dc.subjecthigh-nickel steel
dc.subjectreactor pressure vessel steels
dc.titleThermal resistance of steels with increased strength properties for pressure vessels of advanced VVER reactors of various designs
dc.typejournal-article
dspace.entity.typePublication
oaire.citation.issue3
oaire.citation.volume9
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