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Information × Registration Number 0215U004975, 0115U002610 , R & D reports Title Grain boundary diffusion of interstitial and substitutional elements in iron based alloys popup.stage_title Head Teus Sergiy Myronovych, Кандидат фізико-математичних наук Registration Date 23-12-2015 Organization Institute for metal physics NAS Ukkraine popup.description2 The effect of grain boundaries on the diffusion of interstitial and substitutional atoms in iron was studied experimentally and theoretically. Autoradiography and the sectioning method, applied to different grain size polycrystals, prove that a higher area of the grain boundaries leads to a reduction of the migration of the carbon isotopes. An opposite effect is observed for the cobalt isotopes. Theoretical calculations of hydrogen and carbon migration in selected grain boundaries having different disorientation angles and in the bulk show that, for both interstitial elements, the activation enthalpy for migration is higher in the grain boundaries than in the bulk. Both experimental and theoretical results lead to the conclusion that grain boundaries in iron based alloys act as traps for interstitial atoms and retard their diffusion. To put these results into perspective, hydrogen-induced intergranular cracking is discussed in relation to the specificity of hydrogen diffusivity along the grain boundaries. Product Description popup.authors Теус Сергій Миронович popup.nrat_date 2020-04-02 Close