Creep failure model of a 9Cr1Mo-NvV (P91) steel integrating multiple deformation and damage mechanisms
Résumé
P91 tempered martensitic stainless steels have recently been developed for boilers and turbines of supercritical and ultra supercritical power plants. Under creep loading conditions at high temperature, those steels exhibit changes in creep flow and damage mechanisms depending on the stress level. Several creep flow and damage mechanisms may also be simultaneously activated. The aim of this contribution is to present a new model integrating a coupling between constitutive equations and damage evolution, and considering multiple viscoplastic deformation mechanisms. The model formulation is first introduced. It is then applied to model creep flow and damage of a tempered martensitic stainless steel at 625°C for which creep tests on several kinds of specimen geometry were carried out.
Origine : Accord explicite pour ce dépôt
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