Цай Кира Викторовна


Degree: д-р физ.-мат. наук

Position: ведущий научный сотрудник лаборатории радиационного материаловедения

Phone: 386-68-00 (доб. 3-71)

Email: kira.tsai7@gmail.com

Count articles: 5

Author articles


Changes in microstructure, hardness and magnetic properties during annealing of 12CR18NI9TI steel irradiated in WWR-K reactor to damage doze of 5 dpa at low (80°С) temperature

Authors: Максимкин Олег Прокофьевич, Цай Кира Викторовна

Keywords: сталь, облучение, петли Франка

Organisation: РГП «Институт ядерной физики»

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12Cr18Ni9Ti austenitic stainless steel (a material of the automatic control rod for WWR-K reactor active zone) irradiated to 5 dpa at 80°C and annealed at 450–950°C for 1 hr has been studied using TEM, magnetic properties and microhardness measurements. Evolution in fine structure of the irradiated steel resulting from heat treatment was identified (Frank loops and black dots) and it was compared to changes in magnetic properties. It was assumed that magnetism of austenitic steel is associated with Frank loops of certain size (15–20 nm) in which at a relatively low temperatures (≤300°С) and irradiation dozes (<20 dpa) the formation of ferromagnetic α-phase during ε→α-transformation may occur.

Pitting corrosion in cold-deformed 12Cr18Ni10Ti stainless steel

Authors: Максимкин Олег Прокофьевич, Цай Кира Викторовна, Яровчук Алевтина Васильевна, Рубан Сергей Владимирович

Keywords: сталь, коррозия, деформация, мартенсит

Organisation: РГП «Институт ядерной физики»

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The results of studies on pitting corrosion of 12Cr18Ni10Ti stainless steel austenized after tensile testing at room and low (−20 and −60°C ) temperatures are given. It has been established that local corrosion resistance of cold-deformed stainless steel depends on strain and temperature which determine structure-phase state of material. It is shown that at low degrees of deformation dislocation substructure formed of quasi-homogeneous honeycomb type which has a stabilizing effect on the state of the steel, resulting in increase of resistance to corrosion. Large degree of plastic deformation (>30%) along with the formation processes of high fragmented inhomogeneous structure in 12Cr18Ni10Ti steel initiate phase transformation γ → α΄ to form α΄-martensite, which negatively affects the corrosion resistance of the material.

Changes in phase composition and strength properties of 12Cr18Ni10Ti austenitic steel as a result of deformation and post-deformation annealing

Authors: Цай Кира Викторовна, Рофман О.В., Отставнов М.А., Цай Кира Викторовна, Отставнов М.А., Рофман О.В.

Keywords: облучение, нержавеющая сталь, 12Х18Н10Т

Organisation: РГП «Институт ядерной физики»

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The results of experiments studying the peculiarities of changes in both phase composition and mechanical properties of austenitic 12X18H10T stainless steel, unirradiated and irradiated with neutrons, subjected to low-temperature deformation and post-deformation annealings in the temperature range 300–800 °C are discussed. The features of the formation and growth of the martensitic-phase during deformation and annealing are investigated. The dependence of the α'-phase content on microhardness of austenitic steel is considered.

Changes in phase composition and strength properties of 12Cr18Ni10Ti austenitic steel as a result of deformation and post-deformation annealing

Authors: Цай Кира Викторовна, Рофман О.В., Отставнов М.А., Цай Кира Викторовна, Отставнов М.А., Рофман О.В.

Keywords: облучение, нержавеющая сталь, 12Х18Н10Т

Organisation: Казахский национальный университет им. аль-Фараби

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The results of experiments studying the peculiarities of changes in both phase composition and mechanical properties of austenitic 12X18H10T stainless steel, unirradiated and irradiated with neutrons, subjected to low-temperature deformation and post-deformation annealings in the temperature range 300–800 °C are discussed. The features of the formation and growth of the martensitic-phase during deformation and annealing are investigated. The dependence of the α'-phase content on microhardness of austenitic steel is considered.

The effect of irradiation with helium ions on microstructure and mechanical properties of EP-450 steel deformed at various temperatures

Authors: Максимкин Олег Прокофьевич, Цай Кира Викторовна, Рофман О.В.

Keywords: облучение, сталь ЭП-450, изохронный циклотрон У-150М, снижение деформационного упрочнения, одноосное растяжение

Organisation: РГП «Институт ядерной физики»

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This research examines mechanical properties and microstructural changes of EP-450 steel implanted with He. Steel samples were uniformly implanted with He+2 ions (40 MeV) to concentrations of 240 appm and 44 appm at 100 °С and 400 °С using U-150M isochronous cyclotron. Uniaxial tensile tests were performed at 25 °С, 400 °С and 800 °С. It was shown that at 100 °С mechanical characteristics of non-irradiated and irradiated EP-450 steel are less sensitive to temperature increase up to 400 °С. Steel samples irradiated at 400 °С show a decrease in strain hardening. Plasticity of the irradiated samples decreases at tensile temperatures 25 °С and 400 °С and almost independent on He concentration. High-temperature deformation of the irradiated material leads to similar plasticity as that for non-irradiated material which indicates that high temperature He embrittlement does not present in EP-450 steel at given conditions.