Intermediate temperature creep of directionally solidified Ni-based superalloy containing local recrystallization

▶ The creep rupture life decreased rapidly with the increase of TRF. ▶ Shorter secondary creep regimes and higher creep rate of RX specimen were observed. ▶ The whole RX region had been cracked at the primary creep stage. ▶ A number of slip lines formed at the steady state creep stage. ▶ The process of crack initiation and propagation depends on the temperature and stress.