Abstract
The main part of this investigation are S-N fatigue tests of austenitic stainless steels with different nickel contents (12.6–13.7wt%) in high pressure gaseous helium and hydrogen at −50°C to characterize the influence of hydrogen on the S-N curve. For the steel with 12.6wt% Ni the low cycle fatigue life in hydrogen was about one order of magnitude lower compared to helium. The slopes of the two curves were comparable. The influence of hydrogen decreased with increasing nickel content, which is consistent with tensile test results. The S-N results in He were significantly influenced by the test frequency. Number of cycles to failure decreased with decreasing frequency until saturation at around 0.1Hz. Hydrogen effects were predominant down to a frequency of about 1Hz. Below 1Hz, the decrease in numbers of cycles to failure was dominated by the frequency effect and not by the hydrogen effect. An increased effect of hydrogen for a trapezoid wave form compared to a triangle wave form could not be identified.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
