Effect of misorientation on the fatigue life of nickel-base single crystal superalloy DD5 at 980 °C

Abstract The misorientation of nickel-base single crystal (NBSX) superalloy is always ignored in the current research, which in fact has a certain influence on the fatigue life of NBSXs. To investigate this influence, the fatigue tests of NBSX superalloy DD5 with different misorientation angles have been carried out at 980 °C, and the failure mechanism has been investigated based on the fractographic observation and crystal plastic finite element (CPFE) analysis. The effect of real misorientation on the fatigue life of NBSX has been quantified, which is also reported for the first time.