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Крымская, Ольга Александровна

Научные группы

Научная группа

Лаборатория рентгеновского текстурного анализа (Кафедра №9)

Организационные подразделения

Организационная единица

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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Крымская

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Ольга Александровна

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Recrystallization of cladding tubes from Zr-based alloys for nuclear reactors
(2019) Isaenkova, M. G.; Perlovich, Yu. A.; Fesenko, V. A.; Krymskaya, O. A.; Исаенкова, Маргарита Геннадьевна; Фесенко, Владимир Александрович; Крымская, Ольга Александровна
© 2019 Published under licence by IOP Publishing Ltd.This paper is devoted to the regularities of change in the crystallographic texture and the structure of cladding tubes with a total degree of deformation by their cross-section of 70-80% as a result of polygonization or recrystallization during heat treatment in the temperature range from 480 to 600 °C. It is shown, that there are two competing processes of crystal lattice perfection in cladding tubes at annealing temperatures over 540 °C. The oriented growth of grain nuclei, formed at the boundaries of grains and disoriented with respect to the deformed matrix by an angle of 20-30° about basal axes, is predominant. At the recrystallization of cladding tubes from E110 alloy, a significant change in their crystallographic texture of cold rolling is observed, i.e. an increase of the integral texture parameter fr increases, and a decrease of fT. The grains, formed at the stage of plastic deformation by twinning, prove to be unstable even at the stage of polygonization, due to the mobility of highly disoriented boundaries under conditions of the anisotropic thermal expansion of neighboring regions.
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STUDY OF SUBSTRUCTURAL HETEROGENEITY OF TEXTURED MATERIALS BY THE X-RAY METHOD OF GENERALIZED DIRECT POLE FIGURES Исследование субструктурнои неоднородности текстурованных материалов рентгеновским методом обобщенных прямых полюсных фигур
(2020) Perlovich, Y. A.; Isaenkova, M. G.; Krymskaya, O. A.; Babich, Y. A.; Fesenko, V. A.; Исаенкова, Маргарита Геннадьевна; Крымская, Ольга Александровна; Фесенко, Владимир Александрович
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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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Change in the Crystallographic Texture of the Martensitic Phase in Superelastic Ti–Zr–Nb Alloys with Increasing Tensile Strain
(2022) Zaripova, M.; Fesenko, V.; Krymskaya, O.; Kozlov, I.; Svetogorov, R.; Isaenkova, M.; Фесенко, Владимир Александрович; Крымская, Ольга Александровна; Козлов, Илья Владимирович; Исаенкова, Маргарита Геннадьевна
Superelastic alloys based on Ti–Zr–Nb are low-modulus biocompatible alloys for medical applications. We analyzed the regularities of the development of martensitic transformations (MT) β (bcc) → α′′ (orthorhombic lattice) in Ti–(17–19)Zr–(14–15)Nb (at.%) alloys, where α′′-phase arises under the influence of tensile or compressive stress. The crystallographic texture of β-titanium alloys was well studied. However, this is precisely what determines the recoverable strain in the material. Phase analysis using synchrotron radiation showed that the MT begins at 1% deformation, and at 1.5% the martensite lines are clearly distinguishable. The orientational dependences of the formation of domains of the martensite phase were studied using generalized direct pole figures. The main texture components of the cold rolled up to 97% and then recrystallized foils are {221}〈114〉 and {100}〈011〉. Under tensile deformation up to 1.4%, α′′-phase domains with the orientation (100)[001] is formed from β-grains compressed along the normal direction of the foil. With an increase in the degree of deformation to 1.6%, in addition to the main texture component, the second texture component appears. Its orientation depends on the direction of application of the external stress: (001)[110] in tension along the rolling direction and (1 ¯ 05)[501] in tension in the transverse direction. © 2022, ASM International.
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CRYSTALLOGRAPHIC TEXTURE AND STRUCTURE FORMED IN ROLLED SHEETS OF ZIRCONIUM ALLOYS DURING ANNEALING
(2022) Klyukova, K. E.; Isaenkova, M. G.; Krymskaya, O. A.; Fesenko, V. A.; Исаенкова, Маргарита Геннадьевна; Крымская, Ольга Александровна; Фесенко, Владимир Александрович
This paper examines the processes of recrystallization in sheets of Zr – 2.5% Nb alloy rolled down to a 50–90% deformation and annealed at 610oC for 1, 3 and 5 hours. The heating rate varied from 10 to 100oC/min. With the help of X-ray structure and texture analysis, the authors looked at optimizing the crystal structure of the deformed alloy while examining changes in the crystallographic texture. It was established that annealing of Zr – 2.5% Nb alloy sheets performed at the temperature that corresponds to the dual phase region α + β of an equilibrium phase diagram also leads to recrystallization, as it happens when applying the annealing temperature of 580oC. However, an 11% increase in the concentration of the additional phase suppresses changes in the crystallographic texture, which may be due to the predominant precipitation of β-zirconium at grain boundaries. At the same time, the growth of recrystallized grains still follows the main regularities of orientation: the orientation of growing grains corresponds to the texture maximum slopes of the direct pole figure (0001); an increased pole density was observed on the difference charts of the direct pole figure (10.0), which is indicative of the presence of grains that are disoriented to the deformed matrix at 30o around the base normals. It is shown that the contribution of the above mentioned processes is determined by the type of initial texture, the annealing temperature, the heating rate and the amount of β-phase. An extended annealing time (from 1 to 5 hours) at the temperature of the dual phase region does not cause any significant change in the crystallographic texture.
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Regularities of structure and texture development in austenitic steel during cold rolling and heat treatment
(2022) Krymskaya, O. A.; Isaenkova, M. G.; Fesenko, V. A.; Minushkin, R. A.; Крымская, Ольга Александровна; Исаенкова, Маргарита Геннадьевна; Фесенко, Владимир Александрович; Минушкин, Роман Александрович
The paper studies the regularities of the structure and texture formation in austenitic steel AISI 304 under cold rolling and subsequent heat treatment.Regularities of structure and texture formation depending on the rolling type and deformation degree were established.The ratios of main texture components, the volume fractions and the distortion of the martensite s crystalline lattice were analyzed.It is shown that mechanisms of the austenite Дє martensite phase transformation in the course of cold rolling may change depending on various deformation schemes, as well as mechanisms of the reverse phase transformation variate under subsequent annealing.Herewith depending on the rolling type and deformation degree, the crystallographic texture formation of the nucleating austenite under the heat treatment can have single component or multi-component character and follows different orientation relations.The more scattered martensite texture after deformation results in the formation of fine-dispersed austenite, which hardens the material keeping a sufficient level of plasticity.
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Effect of the Stressed State on the Phase Transformations in Zirconium-Based Alloys
(2022) Korotitskii, A. V.; Stolbov, S. D.; Isaenkova, M. G.; Tenishev, A. V.; Mikhal'chik, V. V.; Krymskaya, O. A.; Fesenko, V. A.; Исаенкова, Маргарита Геннадьевна; Тенишев, Андрей Вадимович; Михальчик, Владимир Валерьевич; Крымская, Ольга Александровна; Фесенко, Владимир Александрович
© 2022, Pleiades Publishing, Ltd.Abstract: The crystallographic aspects of the phase transformations in zirconium alloys under compressive stresses are studied, and the changes in the sizes of cladding tubes, rods, and rings made of E110opt and E125 alloys at compressive stresses and without them are determined. The temperature of the onset of the phase transformation on heating is found to shift toward low temperatures under a load applied to a cladding tube ring in the diametral direction, and a noticeable strain leading to the appearance of ellipticity of the rings are detected. Some of the versions of the Burgers orientation relationship are operative during the reverse β‒α phase transformation under compressive stresses, which manifests itself in the suppression of growth of texture maxima in the applied load direction during cooling. Deformation is shown to be accelerated on heating in the two-phase α + β region under compressive stresses, and the parameters of high-temperature creep are calculated using the temperature dependences of the strain.
Только метаданные
Comparison of the results of texture analysis of zirconium alloys based on the data of backscattered electron diffraction and X-ray radiation of different powers
(2023) Isaenkova, M. G.; Krymskaya, O. A.; Klyukova, K. E.; Bogomolova, A. V.; Dzhumaev, P. S.; Kozlov, I. V.; Fesenko, V. A.; Исаенкова, Маргарита Геннадьевна; Крымская, Ольга Александровна; Богомолова, Анастасия Владимировна; Джумаев, Павел Сергеевич; Козлов, Илья Владимирович; Фесенко, Владимир Александрович
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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 О±-Zr phase and the following additional phases: ОІ-Nb, ОІ-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 ОІ-Nbв†’О±-Zrв†’ОІ-Zr is observed. It is established that during recrystallization, larger grains of О±-Zr are misoriented relative to the deformed matrix by rotating the prismatic axes around the basal axes by 30В°, 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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АНАЛИЗ ВОЛЬФРАМОВЫХ ПЛАСТИН ЛИМИТЕРА ТОКАМАКА Т-10 ПОСЛЕ ДЛИТЕЛЬНОЙ КАМПАНИИ
(НИЯУ МИФИ, 2019) ПИСАРЕВ, А. А.; АРХИПОВ, И. И.; БАБИЧ, Я. А.; БЕРДНИКОВА, М. М.; ГАСПАРЯН, Ю. М.; ГРАШИН, С. А.; ДРОБИНИН, В. Е.; ЕФИМОВ, В. С.; ИСАЕНКОВА, М. Г.; КРЫМСКАЯ, О. А.; ПЕРЛОВИЧ, Ю. А.; СТЕПАНОВА, Т. М.; ФЕСЕНКО, В. А.; Фесенко, Владимир Александрович; Бердникова, Мария Михайловна; Крымская, Ольга Александровна; Ефимов, Виталий Сергеевич; Писарев, Александр Александрович; Исаенкова, Маргарита Геннадьевна; Гаспарян, Юрий Микаэлович
Лимитер токамака Т-10 представлял собой кольцо из нержавеющей стали, на котором были установлены 32 пары вольфрамовых пластин с электронной стороны (e-тайлы) и столько же пластин с ионной стороны (i-тайлы). Пластины были изготовлены в НИИЭФА им.Ефремова из вольфрама марки ВМП производства фирмы «Полема» (г.Тула).