CLEAVAGE RUPTURE OF Ti ALLOY TC11 UNDER FATIGUE-CREEP INTERACTION

The cleavage rupture behaviour of the Ti alloy TC11 with various microstructures,i.e.,equiaxed,duplex and interweaving,has been studied under fatigue-creep interaction at520℃.It was found to be not only related to the rate of creep void initiating,but also control-led by the creep strain accumulation on holding under tension test and stress state atcrack-tip.This seem to be combinably offected by both value of critic void initiating strainand parameter,V_(GC),of critic void growth.