Abstract: The behavior of creep crack growth for turbine disk of Ni-base superalloy GH33A at 600℃, 650℃ and 700℃ was investigated with compact tension (CT)specimen by means of the direct current potential method. In comparison with such Parameters as stress intensity factor K, net section stress(σnet), reference stress (σzref), the C* parameter and loading point displacement rate △,C*is the best one among these mechanical parameters correlation with the creep crack growth rate. The results have also shown that temperature has a serious influence on the creep crack growth behovior.

Key words: Ni-base superailoy, creep, creep crack growth