Научная группа: Лаборатория рентгеновского текстурного анализа (Кафедра №9 ИЯФиТ)
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Исаенкова, Маргарита Геннадьевна
Руководитель научной группы "Лаборатория рентгеновского текстурного анализа"
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Влияние субструктурной неоднородности текстурованных сплавов на основе циркония на анизотропию их физико-механических свойств
(НИЯУ МИФИ, 2020) Крымская, О. А.; Крымская, Ольга Александровна; Перлович, Ю. А.
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Influence of the structural state and crystallographic texture of Zr-2.5% Nb alloy samples on the anisotropy of their thermal expansion
(2021) Isaenkova, M. G.; Tenishev, A. V.; Krymskaya, O. A.; Stolbov, S. D.; Mikhal'chik, V. V.; Fesenko, V. A.; Klyukova, K. E.; Исаенкова, Маргарита Геннадьевна; Тенишев, Андрей Вадимович; Крымская, Ольга Александровна; Михальчик, Владимир Валерьевич; Фесенко, Владимир Александрович
Zirconium remains the main structural material for thermal reactors due to the small capture cross section of thermal neutrons. In the period of stricter safety requirements for reactors with a simultaneous increase in operating parameters, predicting the behavior of the material in emergency situations has gained greater urgency. In this work, we measured the temperature dependence of the thermal expansion of samples cut from thick-walled tubes made of Zr-2.5% Nb alloy that were deformed and annealed in different modes. The analysis of the physical processes responsible for the shaping of the material is carried out. It was found that the anisotropic change in the linear dimensions of cubic samples both during heating and cooling is due to a change in the zirconium content in the beta-phase, phase transformations alpha + beta-Zr -> alpha + beta-Nb -> beta -> alpha + beta-Zr, as well as the preferred orientation of the grains of the alpha-phase, characterized by high anisotropy of linear expansion. It is shown that the expansion of the investigated samples upon heating in the alpha -phase is determined exclusively by the integral texture parameters of Kearns, and the coefficients of thermal linear expansion (TLEC) in different directions vary over a wide range from 3.10-6 to 12.10-6 K-1. During cooling at the stage of the reverse phase transformation of the beta-phase into alpha, an increase in the size of the cubic samples in the tangential direction up to 2.3 % and a decrease in the radial direction to 1.3 % are noted, which is associated with the orientation of the alpha-phase grains formed during cooling in the beta -matrix and anisotropy of the TLEC of the alpha-grains. It is shown that the orientation of the alpha-phase grains in the reverse beta -> alpha transformation is determined not only by the orientation of the basal axes in the initial material, but also by the spatial distribution of the prismatic axes relative to the external directions in the tube. Significant size fluctuations in different directions of the samples obtained using the technology of manufacturing channel tubes for CANDU reactors should lead to the development of significant macrostresses both during heating and cooling of the tube. The structural state of the samples deformed or annealed at 400-530 degrees C does not significantly affect the temperature dependence of the TLEC, but is manifested only in some of its features. In this case, completely recrystallized samples, i.e., with a recrystallization texture, in which the 1120 directions are oriented along the tube axis, are characterized by a significantly lower variation in dimensions in different directions in the temperature range 20-1200 degrees C.
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Regularities of Changes in the Structure of Different Phases of Deformed Zirconium Alloys as a Result of Raising the Annealing Temperature According to Texture Analysis Data
(2023) Isaenkova, M.; Krymskaya, O.; Klyukova, K.; Bogomolova, A.; Kozlov, I.; Dzhumaev, P.; Fesenko, V.; Исаенкова, Маргарита Геннадьевна; Крымская, Ольга Александровна; Богомолова, Анастасия Владимировна; Козлов, Илья Владимирович; Джумаев, Павел Сергеевич; Фесенко, Владимир Александрович
Based on the data of synchrotron and electron microscopic studies of deformed and annealed Russian zirconium alloys, the possibility of analyzing the structural-phase state and crystallographic texture of individual phases has been demonstrated. A qualitative and quantitative phase analysis of deformed and annealed tubes made of Zr-Nb-(Sn-Fe-O) alloys was carried out using diffraction patterns obtained with synchrotron radiation. The main α-Zr phase and the following additional phases: β-Nb, β-Zr, and the Laves phase (intermetallic compound Zr(Nb,Fe)2), were found in the alloys. According to the results of texture analysis of all phases present in the alloy, the mechanisms of plastic deformation, recrystallization, and phase transformations of the main and additional phases were established. It is shown that during plastic deformation of the Zr-1%Nb alloy, a dynamic phase transformation β-Nb→α-Zr→β-Zr is observed. It is established that during recrystallization, larger grains of α-Zr are misoriented relative to the deformed matrix by rotating the prismatic axes around the basal axes by 30°, while fine grains are improved by polygonization and maintain the orientation of the deformed matrix. Processes for changing the orientation of grains of additional phases as a result of high-temperature annealing are also considered.
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Влияние послойной текстурной неоднородности на стойкость к коррозионному растрескиванию под напряжением стальных труб магистральных газопроводов
(НИЯУ МИФИ, 2022) Морозов, Н. С.; Исаенкова, М. Г.
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Electrical Conductivity in Graphite Foils Produced by Rolling and Pressing
(2024) Morozov, N. S.; Shulyak, V. A.; Isaenkova, M. G.; Krymskaya, O. A.; Fesenko, V. A.; Исаенкова, Маргарита Геннадьевна; Крымская, Ольга Александровна; Фесенко, Владимир Александрович
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Институт ядерной физики и технологий
Цель ИЯФиТ и стратегия развития - создание и развитие научно-образовательного центра мирового уровня в области ядерной физики и технологий, радиационного материаловедения, физики элементарных частиц, астрофизики и космофизики.
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Направления исследований:
- Исследование реакторных материалов и титановых сплавов
Циркониевые сплавы, корпусные стали и оболочки быстрых реакторов, топливные материалы. Исследование титановых сплавов со сверхупругостью и эффектом памяти формы
- Исследование сталей различного назначения
Электротехнические трубы магистральных газопроводов, аустенитные стали, ферритно-мартенситные дисперсно-упрочненные оксидами стали
- Разработки моделей и моделирование процессов
Модели текстурообразования и рекристаллизации. Моделирование процессов пластической деформации многофазных сплавов, кристаллизации при селективном лазерном сплавлении порошков
- Анализ структуры и текстуры поликристаллических материалов
Использование нейтронных пучков и синхротронного излучения для анализа структуры и текстуры поликристаллических материалов после пластической деформации, рекристаллизации и фазовых превращений в сплавах