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Information × Registration Number 0220U104649, 0120U104904 , R & D reports Title Physico-mechanical macro, micro and nano mechanisms of hydrogen interaction with low-alloy steels as a fundamental factor in the strength and performance of hydrogen storage and transportation systems popup.stage_title Head Dmytrakh Ihor M., Доктор технічних наук Registration Date 24-12-2020 Organization Physico-Mechanical Institute named after GV Karpenko of the National Academy of Sciences of Ukraine popup.description2 Using the scanning (SEM) and transmission (TEM) electron microscopy methods, the quantitative data about macro, micro, and nano defects in the structure of low-alloyed steels for hydrogen storage and transportation systems were received and analyzed. It was found for the first time that even the short-term presence of the diffusible hydrogen of low concentration in steels leads to irreversible changes in the material structure, namely, significantly increases its defectiveness. The stages of the defects forming in the low-alloyed steels at different levels of their microstructure were established. The classification of defects in low-alloyed steels caused by the action of diffusible hydrogen depending on their sizes at different structural levels of the material was made. Taking into account the complicated configuration of defects, which are not suitable for simple mathematical description, their model representation is proposed which is based on the use of the defect area as its main calculation parameter, and the defect of arbitrary configuration is replaced with the circle of equal area. Examples of the implementation of such an approach for a single defect and a system of coplanar defects are given.  Product Description popup.authors Hembara Nazar Т. Hembara Oksana V. Hrynenko Mykhajlo V. Dmytrakh Ihor M Sapuzhak Yaroslav І. Syrotiuk Andrii M. popup.nrat_date 2020-12-24 Close