Abstract
This study was undertaken to determine methods for metallurgical improvement of cyclic crack growth and fracture properties in Ti-6A1-6V-2Sn. Two heats of the alloy were studied: an α + β processed material containing 0.165% interstitial oxygen and α β-processed material containing 0.077% interstitial oxygen. All test specimens were given a mill anneal heat treatment, in addition some specimens from each heat were given a recrystallization anneal treatment Fatigue-crack growth rates were determined using compact tension specimens and fracture toughness was determined using 1 in. dynamic tear specimens for each material/heat treatment combination. The recrystallization anneal treatment resulted in significant improvements in the fracture resistance of both materials, despite metallographic evidence that die recrystallization-annealed β-processed material did not develop a fully recrystallized structure. Improvements in cyclic crack growth resistance resulting from the recrystallization anneal treatment, per se, were modest. However, the combined effects of recrystallizalion anneal plus a reduction B interstitial oxygen content significantly improved the cyclic crack growth properties of Ti-6Al-6V-2Sn.
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