Abstract
In creep resistant steels, several mechanisms contribute to the degradation of creep properties under long-time service conditions. Most important are the coarsening of the carbide and subgrain structure and grain boundary cavitation. A mechanism-based creep damage model is developed, including a Chaboche type viscoplastic model1 for transient creep, the Rodin and Parks model2 for cavitation damage and a microstructurally motivated softening equation. The model parameters are adjusted to a set of creep curves for a 12% chromium steel (X20 CrMoV12 1) and to quantitative microstructural measurements. The combined model is implemented in the finite element code ABAQUS. Tests on compact specimens are successfully modeled.
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