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Information × Registration Number 0220U000654, 0117U004146 , R & D reports Title Development of science-based technologies of heat treatment of sparingly alloyed steels for manufacturing rolling tool with increased resistance popup.stage_title Head Bobyr Serhii Volodymyrovych, Registration Date 06-08-2020 Organization IRON & STEEL INSTITUTE NATIONAL ACADEMI OF SCIENCE OF UKRAINE popup.description2 The regression dependences of the temperatures of the beginning and end of the phase transformation of austenite in steel on the chemical composition, cooling rate, physicochemical parameters d and Zy, and parameters D1 and D2 are obtained. According to the developed analytical model, the dependences of the phase composition, yield strength and hardness of 20CrNi4V and 25Cr2Mo1V steels on the cooling rate are constructed, their isothermal and thermokinetic diagrams are constructed. The dependence of the microstructure and hardness of 25Cr2Mo1V steel on the cooling rate was experimentally established, it was shown that the hardness of this steel is in a narrow range (38-44 HRC). It was shown that tempering of 25Cr2Mo1V steel at temperatures of 500-600 °C for 1-9 hours leads to the formation of approximately the same microstructure - the structure of tempering bainite. It was established that tempering at 550 °C for 5 hours. provides the highest hardness of steel 25Cr2Mo1V, due to the smallest block sizes of the crystal lattice. A new technology has been developed for the manufacture of a tube-rolling tool - mandrels of a piercing mill made of 25Cr2Mo1V steel, which provided an increase in the resistance of mandrels by more than 2 times.5481 Product Description popup.authors Балаханова Тетяна Валеріївна Борисенко Андрій Юрійович Головко Віталій Олексійович Голубенко Тетяна Миколаївна Груздова Алла Іванівна Крот Павло Вікторович Кукса Олег Володимирович Левченко Геннадій Васильович Лошкарьов Дмитро Валерійович Луценко Ольга Владислівівна Парусов Едуард Володимирович Поздеева В.А. Приходько Ігор Юрійович Сагура Людмила Володимирівна Сивак Анна Іванівна Чуйко Ігор Миколайович шевченко В.Н. popup.nrat_date 2021-03-17 Close