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The physical mechanisms of deformation and fracture that control the shapes of creep curves in superalloys are reviewed and creep by these mechanisms is modelled using the approach of continuum damage mechanics. The resulting constitutive and damage evolution laws for creep are thus fully compatible with the underlying physics of the process. The equation-sets are implemented in a computer system (CRISPEN) that operates on an IBM AT or SYSTEM 2 personal computer to allow: (a) analysis of creep curves; (b) compilation of a database representing full creep curve shapes; (c) simulation of creep curves for abitrary test conditions and (d) comparison of simulated curves with available data. CRISPEN has been applied successfully to a range of nickel-base superalloys (wrought, conventionally cast, directionally solidified, single crystal). Examples are given of the agreement between creep simulations and experimental data for both representations of isolated creep curves and extrapolations to different stress and/or temperature and to variable stress/temperature conditions.

A Model Based Computer Analysis of Creep Data (Cripsen): Applications to Nickel-Base Superalloys