Search academic texts

Information × Registration Number 0221U102734, 0120U103319 , R & D reports Title Study of the influence of the structural state on corrosion properties and phase transformations of reactor austenitic steels in lead-based heat carrier popup.stage_title Head Fedirko Viktor M., Доктор технічних наук Registration Date 09-02-2021 Organization National Science Center "Kharkiv Institute of Physics and Technology" popup.description2 Peculiarities of corrosion behavior of T91 ferritic-martensitic steel with ultra-dispersed structure in lead melts with oxygen concentration C[O]Pb ≈ 5×10-7 wt.% At a temperature of 500°С at exposures of 500 and 1000 h were evaluated. It was found that for ferritic-martensitic steel T91 without prior hardening treatment in a lead melt with an oxygen concentration of 5×10-7 wt.% corrosion process is intergranular in nature, which is characterized by etching of grain boundaries and penetration of the melt into the matrix with simultaneous dissolution of alloying elements Cr, Mn at exposures up to 500 hours. At an exposure of 1000 h, the formation of an oxide film based on Cr and Si on the surface was recorded, which serves as a barrier between the surface and the lead melt. For T91 steels that have been subjected to hardening treatment, at exposures up to 500 h, a non-continuous oxide film is formed, which partially protects the surface from lead melt. At an exposure of 1000 h, a continuous oxide film is formed, similarly to steel samples without prior hardening treatment, which protects the surface from the negative effects of lead melt. It is established that the pre-hardening treatment intensifies the process of formation of oxide films on the steel surface with the holding time, and the formed structure blocks the penetration of lead into the depth of the matrix. Product Description popup.authors Kukhar Ivan S. Luk'yanenko Oleksandr H Melnyk Khrystyna R Fedirko Viktor M popup.nrat_date 2021-02-09 Close