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This paper presents a creep constitutive reasonably reflecting theinfluence of stress triaxiality on creep deformation and a creep cavity growth modelappropriately describing the effect of stress biaxiality on the multi-axial creep ductility.Three-dimensional finite element analyses are performed to simulate the creep growthbehaviors of a single crack in thumbnail crack specimens and multiple cracks in atensioned plate at high temperature, respectively. Numerical results show the proposedcreep-damage model is proved to be of excellent predictive capability.