Effect of severe plastic deformation on radiation hardening of T91 ferritic-martensitic steel

• Дата: 2021
• Автори: Voyevodin, V.N., Tolstolutskaya, G.D., Karpov, S.A., Velikodnyi, A.N., Tikhonovsky, M.A., Kalchenko, A.S., Tolmachova, G.N., Vasilenko, R.L., Kopanets, I.E.
• Формат: Стаття
• Мова: English
• Опубліковано: Національний науковий центр «Харківський фізико-технічний інститут» НАН України 2021
• Назва видання: Вопросы атомной науки и техники
• Теми: Physics of radiation damages and effects in solids
• Онлайн доступ: http://dspace.nbuv.gov.ua/handle/123456789/194682
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Effect of severe plastic deformation on radiation hardening of T91 ferritic-martensitic steel / V.N. Voyevodin, G.D. Tolstolutskaya, S.A. Karpov, A.N. Velikodnyi, M.A. Tikhonovsky, A.S. Kalchenko, G.N. Tolmachova, R.L. Vasilenko, I.E. Kopanets // Problems of Atomic Science and Technology. — 2021. — № 2. — С. 35-42. — Бібліогр.: 34 назв. — англ.

Effect of thermomechanical treatment on radiation hardening behavior in T91 ferritic-martensitic steel was evaluated. An applying of severe plastic deformation (SPD) by the “upsetting-extrusion” method and subsequent heat treatment led to a considerable grain refinement, crushing of martensite lamellas, reduction of MX carbides size and their more uniform distribution. Nanoindentation measurements of SPD-modified steel revealed a 1.4-fold increase in the hardness relative to the initial steel. Irradiation response of modified steel was examined after 1.4 MeV Ar+ ion irradiations in the dose range of 10…45 displacements per atom (dpa) at room temperature and 460 °C. Microstructure characterization was performed by means of transmission electron microscopy (TEM). It was found that dislocation loops and nano-sized argon bubbles dominated the damage microstructure after ion irradiation. The effects of SPD-induced transformations as well as nano-bubbles formation are discussed regarding to the hardening phenomenon observed in irradiated steel.