Studium vlivu dynamiky poklesu obsahu vodíku v ocelích s KSC a KPC mřížkou

Abstract

This thesis deals with the effect of hydrogen drop dynamics on the mechanical and fractographic properties of steels with different crystal structures. Two types of stainless steels, austenitic and martensitic precipitation hardenable, with different crystal lattice types were studied. By means of electrochemical and high-pressure hydrogenation, these materials were exposed to a hydrogen environment, while subsequent tensile tests carried out at different time intervals, complemented by fractographic analysis, allowed to follow the dehydrogenation process and its influence on the materials properties. The results show that steel with an austenitic microstructure exhibits very high resistance to hydrogen embrittlement, while a significant reduction in ductility and brittle failure were observed in martensitic precipitation-hardenable steel. The work also confirms the presence of irreversible hydrogen traps and provides new insights into the diffusion of hydrogen from steels under normal room conditions. The conclusions of this study may help to optimize structural materials for use in hydrogen-exposed environments.