Abstract
Slow straining of compact tension specimens of Grade-2 and Grade-12 titanium has been developed as a means of assessing the likelihood of failure in titanium containers for nuclear waste disposal. Hydrided specimens were strained to failure and the stress intensity factors corresponding to slow crack growth and fast brittle failure calculated. In all the materials tested, stable slow crack growth in the as-received material was replaced by fast brittle failure at high hydrogen levels, but whether or not the latter was preceded by slow subcritical crack growth depended upon the hydrogen concentration, the alloy concerned and the orientation of the applied stress with respect to preferred orientation in the fabricated material. The orientation of β-phase present appeared to exert a greater influence than the basal pole concentration on susceptibility to slow crack growth and the onset of fast brittle failure.
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