Accéder directement au contenu Accéder directement à la navigation
Communication dans un congrès

Influence of strain rate on P92 microstructural stability during fatigue tests at high temperature

Abstract : 9-12%Cr creep-resistant ferritic-martensitic steels are candidates for structural components of Generation IV nuclear power plants. However, they are sensitive to softening during fatigue and creep-fatigue loading. To better understand softening mechanisms in ASTM Grade 92, fatigue tests were carried out at 823 K at various strain amplitudes. Two different values of the strain rate (2 10−3 s−1 and 10−5 s−1) were used for one strain amplitude. The softening behavior is mainly due to microstructural evolution. Examination of fractured specimens (hardness tests, TEM) shows an influence of strain rate on both increase in subgrain size and decrease in free dislocation density during cycling. Study of the evolution of isotropic, kinematic and viscous contributions to stress during fatigue tests shows a decrease in the kinematic contribution during cycling. A simplified mean field polycrystalline model based on subgrain growth is proposed in order to account for this strain rate effect. Potential impact on further creep resistance behavior is discussed.
Liste complète des métadonnées

Littérature citée [24 références]  Voir  Masquer  Télécharger
Contributeur : Bibliothèque Umr7633 <>
Soumis le : mardi 20 février 2018 - 16:32:25
Dernière modification le : mardi 28 avril 2020 - 11:28:10
Document(s) archivé(s) le : lundi 21 mai 2018 - 13:33:26


Giroux-Dalle-Sauzay Procedia e...
Fichiers éditeurs autorisés sur une archive ouverte



Pierre-François Giroux, F. Dalle, Maxime Sauzay, Christel Caës, Benjamin Fournier, et al.. Influence of strain rate on P92 microstructural stability during fatigue tests at high temperature. Fatigue 2010, Jun 2010, Prague, Czech Republic. pp.2141-2150, ⟨10.1016/j.proeng.2010.03.230⟩. ⟨hal-00509939⟩



Consultations de la notice


Téléchargements de fichiers