Abstract
The susceptibility of three titanium alloys to subcritical crack growth in air under sustained load was determined as a function of hydrogen content. The alloys examined contained from 7 to 76 p.p.m. and included Ti6Al4V, Ti8Al1Mo1V and Ti4Al3Mo1V. Tests were conducted with 0.25-inch-thick, fatigue-precracked compact tension specimens. Crack-growth behavior was quite sensitive to hydrogen content; time to failure increased as hydrogen content was decreased, while the threshold stress intensity — defined as the highest initial stress intensity leading to failure within 1 month — appeared to attain a minimum value at an intermediate hydrogen content. Hydrogen content also was shown to have a significant effect on fracture toughness; dramatic improvements in toughness accompanied reductions in hydrogen content to low levels. The effects of hydrogen on toughness were independent of loading rates varying between 60 and 4600 k.s.i.-inch 1 2 per minute.
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