Study of the Creep Resistance in Ti-62222S Alloy

摘要

Primary creep behavior was studied in Ti-6Al-2Sn-2Zr-2Cr-2Mo-0. 16Si (Ti-6-22-22S) alloy. Creep tests were performed at 480 degrees C under various stresses in the range of 150 to 500 MPa. The creep behavior was analyzed in terms of Larson-Miller time to reach 0.1 % creep strain. The results were compared with those in other Ti alloys as well as in Ti-6-22-22S reported by others. It was found that the a+B processed Ti-6-22-22S showed better creep resistance than the B processed alloy. It was also found that the a+B processed alloy showed much better creep resistance than Ti-6Al-4V (Ti-64) and is in general agreement with that of Ti-6Al-2Sn-4Zr-6Mo (Ti-6246). Therefore, the Ti-6-22-22S alloy is an attractive alloy not only for room-temperature applications but also for long term load-carrying applications near 400 degrees C and lower. The alloy may replace the existing Ti-6246 alloy and can be used for turbine engine parts at intermediate temperature in addition to conventional applications to air frame parts.