Abstract
Delayed failure tests of hydrogen-charged specimens result in a large scatter of failure times and failure stresses, analogous to the brittle behaviour exhibited by ceramics. Because of the considerable variation in results, a large number of specimens have to be tested in order to gain an indication of the performance of a particular material; when two materials of similar susceptibility to hydrogen embrittlement are tested, interpretation of the results is often difficult. In the present investigation, seven similar steels were tested in the delayed failure mode to determine their relative susceptibilities to hydrogen embrittlement. These steels were of similar composition and microstructure and showed a low susceptibility to hydrogen embrittlement. The results were analysed using established statistical analysis methods, and by a modified statistical analysis which was developed to describe the failure behaviour. The results of the delayed failure tests and the statistical analyses are presented.
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