Accéder directement au contenu Accéder directement à la navigation
Article dans une revue

Assessment of specific contribution of residual stress generated near surface anomalies in the high temperature fatigue life of a René 65 superalloy

S. Gourdin 1, 2 J. Cormier 2 Gilbert Hénaff 2 Y. Nadot 3, 2 F. Hamon 2 S. Pierret 4
3 ENDO - ENDOmmagement et durabilité ENDO
Département Physique et Mécanique des Matériaux - Département Physique et Mécanique des Matériaux
Abstract : This study evaluates the influence of residual stresses induced by the fabrication of surface anomalies on the fatigue crack growth in a nickel based superalloy. To separate the notch effect of the geometry from the residual stress field induced by fabrication of the surface flaws, two V‐type anomalies are considered: scratches and dents with equivalent morphology and size. A specially designed heat treatment has been used to reduce the magnitude of residual stresses around these anomalies in order to highlight their effects on the different stages of the crack propagation, under low cycle fatigue conditions at 400 °C. The crack initiation life is short for both anomalies but in the presence of compressive residual stresses, a decrease of the fatigue crack growth rate has been observed during the first stages of the crack propagation. Furthermore, the results showed that without residual stresses, scratches and dents exhibit the same behaviour. Thus, the residual stress field below surface anomalies is the main parameter controlling the fatigue life from surface anomalies.
Type de document :
Article dans une revue
Liste complète des métadonnées

https://hal-mines-paristech.archives-ouvertes.fr/hal-02901676
Contributeur : Magalie Prudon <>
Soumis le : vendredi 17 juillet 2020 - 14:19:24
Dernière modification le : mercredi 21 octobre 2020 - 12:02:02

Identifiants

Citation

S. Gourdin, J. Cormier, Gilbert Hénaff, Y. Nadot, F. Hamon, et al.. Assessment of specific contribution of residual stress generated near surface anomalies in the high temperature fatigue life of a René 65 superalloy. Fatigue & Fracture of Engineering Materials & Structures, Wiley-Blackwell, 2017, 40 (1), pp.69-80. ⟨10.1111/ffe.12475⟩. ⟨hal-02901676⟩

Partager

Métriques

Consultations de la notice

43