Abstract: Based on the relicf of interfacial energy density by dislocation generation at the γ-γ interfaces, a rafting prediction criterion has been developed for nickel-base single crystals under multiaxial stresses. The diagrams of rafting have been presented, and confirmed by experimental result.. The rafting process have been analyzed quantitatively by the relief of intedfacial energy. The criterion has been applied to study the creep behavior. The example of creep life analysis shows that the criterion can be correlated satisfactorily to the crystallographic orientation dependence of creep behavior.

Key words: rafting prediction criterion, multiaxial stress state, crystallographic orientation dependence, creep behavior, nickel-base single crystal superalloy