1995 Volume 45 Issue 11 Pages 643-648
Fatigue tests were carried out on notched specimens of Ti-15V-3Cr-3Al-3Sn alloy at frequency of 0.5 or 0.1Hz and stress ratio of 0.1 under electrolytic hydrogen-charging in sulfuric-acid aqueous-solution at charging current densities of 1000 and 2000A/m2, and the results were compared with those tested in air. The crack initiation life is decreased by hydrogen charging especially when the range of apparent stress intensity factor is low. The crack propagation rate is decreased by hydrogen charging when the range of stress intensity factor ΔK is moderate, while when ΔK is small the crack propagation rate under hydrogen charging is almost the same as that in air. The fracture surface of charged specimen reveals larger amount of quasi-cleavage fracture. The measurement of crack closure reveals that the crack opening ratio under charging is almost the same as that in air.
