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Information × Registration Number 0224U000096, 0121U108961 , R & D reports Title Investigation of the role of the hydrogen factor in the operational degradation of structural steels popup.stage_title Head Zvirko Olha I., д.т.н. Registration Date 02-01-2024 Organization Physico-Mechanical Institute named after GV Karpenko of the National Academy of Sciences of Ukraine popup.description2  The possibility of implementing strain ageing in local micro volumes of ferrite-pearlite steels due to their plastic deformation under the influence of internal stresses caused by accumulated hydrogen has been experimentally substantiated. It was shown for the first time that the mechanism of hydrogen-induced strain ageing in ferrite-pearlite steels was realized in dominant paths for hydrogen. The mechanism of operational damaging of ferrite-pearlite steels consists in the formation of defects of a hydrogen-deformation nature, facilitated in low-strength steels, in contrast to the decohesion mechanism characteristic of high-strength steels. The ratio of yield strength to ultimate strength is proposed as an indicator to differentiate steels according to the dominant mechanism of damage development caused by hydrogen. It is proposed a staged development of operational damage in low-strength ferrite-pearlite steels involving hydrogen is proposed by forming hydrogen-deformation voids. It is shown that hydrogen, absorbed by long-term operated rolled ferrite-pearlite pipe steels, significantly enhances their anisotropy and thus distinctions in mechanical properties in different directions relative to the rolling direction, primarily plasticity, impact toughness, the resistance to hydrogen embrittlement and crack propagation, due to the delamination between fibres and in the vicinity of non-metallic inclusions along the rolling direction, and fracture of partitions between them by cleavage. It is established that the energy of tensile deformation of a hydrogenated specimen with a crack before its start in the direction between the fibres is 60 times lower than across them. It is found that the formation of a specific coarse-grained microstructure can cause a contradiction between the metal strength and its brittle fracture resistance and hydrogen embrittlement. Inhibitor protection against corrosion and corrosion-fatigue fracture has been developed for operated ferrite-pe Product Description popup.authors Bartoshevsʹkyy Denys P. Venhrynyuk Oleh І. Hredilʹ Myroslava I. Demyanchuk Dmytro O. Demianyshyn Nataliia Dubyk Yaroslav Romanovich Zvirko Olha I. Kyryliv Volodymyr I. Kost' Yaroslav P. Krechkovsʹka Halyna V. Kurnat Ivan M. Maksymiv Olʹha V. Mytsyk Bohdan H Moskva Mykhaylo I. Nykyforchyn Hryhoriy М. Proskurnyak Roman V. Svirsʹka Lesya M. Solovej Petro R. Student Oleksandra Z. Tsybailo Ivan O. Tsyrulnyk Oleksandr T Shtoyko Ivan P. popup.nrat_date 2024-01-02 Close