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Information × Registration Number 0217U006389, 0116U005094 , R & D reports Title The study of the physical mechanisms of radiation-induced degradation of the physical properties of materials existing and future atomic-generating complexes of the new generation for energy security of Ukraine popup.stage_title Head Voyevodin Victor Mykolayovych, Доктор фізико-математичних наук Registration Date 19-05-2017 Organization National Science Center "Kharkiv Institute of Physics and Technology popup.description2 An important place in radiation material science the relevance and practical value is the study of the nature of radiation embrittlement of RPV steels of WWER reactors. In this report, based on the analysis of modern aspects of the physical nature of embrittlement, involves a comprehensive study of the influence of various factors (nature of the defect structure, chemical and phase composition of steels, conditions and modes of exposure, etc.) on the change of physico - mechanical properties of metals and alloys, it was found that the implementation of the structural approach to mitigate radiation embrittlement of RPV steels lies in the optimization of the processes of relaxation of internal stresses and control the nature of accumulation and redistribution of defects of radiation origin. On this basis, proposed a method of reducing embrittlement of steels : ultrasonic impact. To determine the mechanism of nucleation of cracks and other defects in nonequilibrium systems (annealing, irradiation, deformation) in elastic range of stress, the mechanisms of the formation of free volume in the material structure due to collective processes- athermic shear phase transformations of martensitic type. It is shown that the control of the degree of tetragonal distortion of the crystal lattice of the irradiated vessel steel can be an indicator of the degree of damage, which directly precedes the beginning of the nucleation of cracks in steel. Developed a phenomenological model of temperature dependence of yield stress, which corresponds to the behavior of irradiated materials with different types of lattices, which allows to predict the temperature intervals manifestations of radiation embrittlement. Product Description popup.authors Ільченко МИкола Іванович Березняк Олена Петрівна Волчок Олег Йосипович Габелкова Світлана Васильовна Гамов Віктор Олегович Гоженко Сергій Васильович Гугля Олексій Григорович Кальченко Олександр Сергійович Крайнюк Евген ОЛександрович Лаптєв Ігор МИколайович Марченко Юрій Олександрович Митрофанов Анатолій Сергійович Ожигов Леонід Семенович Пархоменко Олександр.Олексійович Пилипенко Микола Миколович Рибальченко Нінель Діонісовна Ружицький Велерій Володимирович Толстолуцька Галина Дмитрівна Улибкін Олександр Леонідович Шевцов Анатолій Богданович popup.nrat_date 2020-04-02 Close