Vliv vysokotlakého vodíku na kinetiku růstu trhlin ocelí pro výrobu tlakových lahví

Abstract

The main goal of this thesis is to verify and quantify negative effect of hydrogen on fatigue crack growth rate in structural steels especially used for production of pressure cylinders. A possible occurrence of hydrogen and its spreading in steels is described in theoretical part, as well as the types of hydrogen penetration in steels, hydrogen embrittlement, effect of sulphide environment on steel structure and properties of structural steels. The thesis also describes a hydrogen storage in pressure cylinders and a possible effect of high pressure hydrogen on steels. The practical part shows an effect of high-pressure hydrogen on a fatigue crack growth rate in two types of structural steels, which are typically used for production of pressure cylinders and high pressure hydrogen storage including. Fractographic examination of fracture surfaces of the specimens tested in air and hydrogen for studying the changes in the fracture mechanism are presented too.