Room Temperature Creep of Ti-6Al-4V
GEORGE WASHINGTON UNIV WASHINGTON DC INST FOR THE STUDY OF FATIGUE FRACTURE AND STRUCTURAL RELIABILITY
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Recent investigations have shown that Ti-6Al-4V 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.
- Properties of Metals and Alloys