Abstract
The mechanisms of low-cycle, fatigue crack nucleation and early growth were investigated at room temperature for Ti-17 (an α+ β titanium alloy). The investigation includedβ processed, high temperature α+ β processed, and low temperaturea + β processed material. The mechanisms of crack nucleation and the path of early crack growth were found to vary with microstructure. Low temperature α+ β processed material demonstrated later crack nucleation but more rapid early crack growth than the other two thermomechanically processed forms. High temperature α+ β processed material containing microstructural flaws, commonly referred to as β-flecks, showed a degradation of fatigue life at high cyclic strain ranges. Results are discussed in terms of microstructural sites of plastic strain concentration.
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