The creep crack growth behaviour of Alloy 718 at 923K has been investigated. It is found that its creep crack growth is controlled by stress intensity factor regardless of load level, loading change and crack growing history. The metallographic analysis indicates that the creep crack growth mechanism of this alloy at 923K comprises three stages. Based on this mechanism, a creep crack growth model has been developed where crack growth rates relate with the effective driving force in sinh function. In addition, the effect of microstructure on the creep crack growth behaviour of Alloy 718 has been studied. The results reveal that the crack growth rates strongly depend on the grain size and the carbide structure. These phenomena have been explained by the diffusion and tearing process in the creep crack growth mechanism.
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