Rafting prediction criterion for nickel-base single crystals under multiaxial stresses and crystallographic orientation dependence of creep behavior

Based on the relief 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 results. The rafting process has been analyzed quantitively by the relief of interfacial 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.