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Information × Registration Number 0219U004270, 0116U006893 , R & D reports Title Determination of critical levels of hydrogen accumulation and the impact of hydrogen-induced microstructural changes on the degradation of physical and mechanical properties of structural materials of operating and future nuclear power plants popup.stage_title Head Tolstolutska Galyna Dmytrivna, Доктор фізико-математичних наук Registration Date 22-04-2019 Organization National Science Center "Kharkiv Institute of Physics & Technology" popup.description2 Data on the effect of the radiation-induced structure of the material, the state of the surface, and the preliminary heat treatment on migration, trapping and desorption of hydrogen are obtained. Numerical simulation of the processes occurring during the experiment is performed: implantation, diffusion, interaction with traps and recombination, and the deuterium trapping parameters are determined. In the case of preliminary irradiation of steels with ions of inert gases (helium, argon), additional hydrogen traps are created associated with the formation of gas-filled bubbles. According to the experimental data and calculations, the critical factors that contribute to the accumulation of deuterium and limit its release from the steels are also the interphase boundaries and the state (degree of contamination / oxidation) of the material surface with deuterium retention up to ~ 1500 K. It has been established that under conditions of the generation of radiation defects hydrogen has an effect on hardening at concentrations of ~1 at.%. The results of theoretical and experimental studies of the solubility, diffusion, and permeation of hydrogen, the nature of hydrogen bond with defects, as well as critical levels of hydrogen accumulation, its distribution in the bulk, and the mechanisms of interaction with the material are summarized. The most probable mechanisms of material degradation caused by hydrogen accumulation are analyzed. Recommendations were given on minimizing the negative impact of hydrogen and preventing a reduction of operating characteristics of structural materials. Product Description popup.authors Бикасов Костянтин Вікторович Вікторія Олександрівна Проголаєва Журба Володимир Іванович Карпов Сергій Олександрович Копанець Ігор Євгенович Луценко Валентин Дмитрович Луценко Сергій Валентинович Мануйленко Олег Вячеславович Марченко Юрій Олександрович Нікітін Аркадій Валерійович Решетняк Олена Миколаївна Ружицький Валерій Володимирович Сашенко Станіслав Олегович Слюсаренко Тамара Михайлівна Сунгуров Богдан Сергійович Толстолуцька Галина Дмитрівна Шульгін Микола Анатолійович Яєс Наталія Анатоліївна popup.nrat_date 2020-04-02 Close