Sustained-load crack growth in the near threshold regime was studied at room temperature in a mill-annealed Ti-6Al-4V titanium alloy forging using mini-C(T) specimens in the C-L orientation. The observed sustained-load cracking behavior exhibited an apparent crack length dependence beyond that accounted for by the fracture mechanics parameter K. In addition, the initial value of K, applied after crack extension by fatigue, influenced the subsequent crack growth rates. The influence of the far-field specimen stresses on the hydrogen diffusion process at the crack tip and transient crack growth rate effects appear to be responsible for the observed behavior.

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