EFFECTS OF HYDROGEN 0N FATIGUE OF VANADIUM AND NIOBIUM

摘要

The fatigue behavior of unalloyed vanadium and niobium as veil as their alloy with hydrogen is described, The response of vanadium-hydrogen alloys to cyclic loading is shown to depend markedly upon the presence or absence of notches, the hydrogen level, method of test, and frequency. In general, hydrides improve high cycle life of unnotched alleys, but are detrimental in the presence of a notch. Low test frequencies also lead to reduced fatigue lives. Stress-assisted hydride growth in previously hydrided alloys has been noted both in fatigue and in delayed failure experiments. Unalloyed vanadium and solid solution vanadium-hydrogen alloys do not undergo delayed failure.