from the conferences organized by TANGER Ltd.
Currently, technological development is focused, among other things, on hydrogen and its technologies. Hydrogen storage must be very well secured and material resistance against hydrogen embrittlement is tested using different approaches. Nevertheless, there are three specified methods listed in EN ISO 11114-4 standard, which are disc test, fracture mechanic test and test method to determine the resistance to hydrogen assisted cracking of steel cylinders. Many works showed differences in results evaluated from latter and last method, eventually method for measurement of fracture toughness. Thus, rising crack opening test according to EN ISO 12135 standard, and last method stated in EN ISO 11114-4, i.e., constant displacement test, were done in this paper to find out, how hydrogen damages steel mentioned above. This paper aims on chromium molybdenum steel 34CrMo4, which is often used for production of metal pressure cylinders. Compact tension specimens, respectively modified compact tension specimens with central hole, were prepared and tested for fracture toughness measurement in air and in high-pressure hydrogen gas at 30 MPa, respectively for latter method.
Keywords: Hydrogen embrittlement, fracture toughness, pressure cylinders, 34CrMo4 steel© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.