Microstructure-informed prediction of hardening in ion-irradiated reactor pressure vessel steels - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Metals Année : 2024

Microstructure-informed prediction of hardening in ion-irradiated reactor pressure vessel steels

Résumé

Ion irradiation combined with nanoindentation is a promising tool for studying irradiation-induced hardening of nuclear materials, including reactor pressure vessel (RPV) steels. For RPV steels, the major sources of hardening are nm-sized irradiation-induced dislocation loops and solute atom clusters, both representing barriers for dislocation glide. The dispersed barrier hardening (DBH) model provides a link between the irradiation-induced nanofeatures and hardening. However, a number of details of the DBH model still require consideration. These include the role of the unirradiated microstructure, the proper treatment of the indentation size effect (ISE), and the appropriate superposition rule of individual hardening contributions. In the present study, two well-characterized RPV steels, each ion-irradiated up to two different levels of displacement damage, were investigated. Dislocation loops and solute atom clusters were characterized by transmission electron microscopy and atom probe tomography, respectively. Nanoindentation with a Berkovich indenter was used to measure indentation hardness as a function of the contact depth. In the present paper, the measured hardening profiles are compared with predictions based on different DBH models. Conclusions about the appropriate superposition rule and the consideration of the ISE (in terms of geometrically necessary dislocations) are drawn.

Domaines

Matériaux
Fichier principal
Vignette du fichier
2024_LAI_Metals_ENTENTE.pdf (2.36 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-04472469 , version 1 (02-04-2024)

Identifiants

Citer

Libang Lai, Jann-Erik Brandenburg, Paul Chekhonin, Arnaud Duplessi, Fabien Cuvilly, et al.. Microstructure-informed prediction of hardening in ion-irradiated reactor pressure vessel steels. Metals, 2024, 14 (3), pp.257. ⟨10.3390/met14030257⟩. ⟨hal-04472469⟩
11 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More