Room temperature creep of Ti--6Al--4v. Technical report. [. cap alpha. -. beta. anneal, recrystallization anneal,. beta. anneal]
Recent investigations have shown that Ti--6Al--44V can exhibit an appreciable amount of creep at room temperature. In the present investigation three different microstructures (alpha--beta anneal, recrystallization anneal and beta anneal) of Ti--6Al--4V were examined under dead weight torsional step loading. The loading sequence was forward, reverse and 2nd forward loading. It was concluded that even at a stress level well below the yield point the alloy exhibits creep in forward loading and increasing creep strain in reverse loading and 2nd loading. In addition, the threshold stress for creep initiation is much lower in reverse loading and 2nd forward loading in comparison to forward loading. Furthermore, the rate of creep at constant stress was different in different microstructures of the alloy; the maximum creep rate occurred with the recrystallization anneal, and the minimum creep rate occurred with the beta anneal. This type of creep would be important in design of structures subjected to long-time cyclic loading. (auth)
- Research Organization:
- George Washington Univ., Washington, DC (USA). Inst. for the Study of Fatigue Fracture and Structural Reliability
- OSTI ID:
- 7116554
- Report Number(s):
- AD-A-028773
- Country of Publication:
- United States
- Language:
- English
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