Abstract

The fatigue of TC17 titanium alloy at high temperature could present fatigue failure mode or mixed failure mode with ductile cracks and local regions of fatigue cracks. For the former, the surface crack initiation tends to occur for low fatigue life, a competition between surface and internal crack initiation presents for medium fatigue life, and the internal crack initiation tends to occur for long fatigue life. The oxidation has a negative effect for the fatigue life under high stress amplitudes. For the latter, the fatigue life is generally low and the oxidation has no harmful influence on fatigue life.

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