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

ToF-SIMS analyses of brittle crack initiation of T91 steel by liquid sodium

Abstract : Tempering the martensitic T91 steel at 550 °C instead of 750 °C (recommended heat treatment) makes T91 more sensitive to liquid metal embrittlement. Especially, in liquid sodium, T91 tempered at 550 °C exhibited a brittle fracture while it was ductile in air. Liquid sodium initiated an intergranular crack which then propagated by transgranular mode in the bulk of the specimen. ToF-SIMS analyses were performed on dedicated Small Punch Test specimens in order to distinguish the contribution of the mechanical loading from the sodium environment. Controlled elastic or plastic deformations on pre immersed (503 °C during 169 h) and on as received materials were performed in liquid sodium at 450 °C. Sodium penetration at prior austenitic grains boundaries and at laths boundaries has been pointed out by TOF-SIMS. It is concluded that the sodium penetration requires plastic deformation.
Liste complète des métadonnées

https://hal.univ-lille.fr/hal-03042937
Contributeur : Lilloa Université de Lille <>
Soumis le : lundi 7 décembre 2020 - 09:23:01
Dernière modification le : jeudi 18 février 2021 - 03:32:38

Identifiants

Collections

Citation

Ouadie Hamdane, Jean-Bernard Vogt, Ingrid Proriol Serre, Nicolas Nuns. ToF-SIMS analyses of brittle crack initiation of T91 steel by liquid sodium. Materials Chemistry and Physics, 2014, Materials Chemistry and Physics, 145, pp.243-249. ⟨10.1016/j.matchemphys.2014.02.016⟩. ⟨hal-03042937⟩

Partager

Métriques

Consultations de la notice

20