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Fatigue-fluage des aciers martensitiques à 9-12%Cr : comportement et endommagement

Abstract : 9-12%Cr martensitic steels are studied in the framework of the generation IV nuclear reactors. Most of the structural components for which these still may be used will be subjected to high temperature (550∞C) creep-fatigue loadings. The PhD was focused on the understanding and modeling of the cyclic stress-strain behaviour and of the damage mechanisms. The models finally proposed are based on detailed observations carried out on SEM, TEM and EBSD. The cyclic softening effect of these steels is attributed to the coarsening of their microstructure. A micromechanical model based on physical parameters is proposed and leads to encouraging results. The observed damage results from the interactions between creep, fatigue and oxidation. Two main types of damage are observed and explained. A lifetime prediction model is proposed and gives very good results. Possible extrapolations of the present results and models are discussed.
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Submitted on : Friday, January 11, 2008 - 10:37:57 AM
Last modification on : Friday, October 23, 2020 - 4:48:20 PM
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  • HAL Id : tel-00203753, version 1

Citation

Benjamin Fournier. Fatigue-fluage des aciers martensitiques à 9-12%Cr : comportement et endommagement. Mécanique [physics.med-ph]. École Nationale Supérieure des Mines de Paris, 2007. Français. ⟨NNT : 2007ENMP1473⟩. ⟨tel-00203753⟩

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