Stability of fatigue cracks at 350 °C in air and in liquid metal in T91 martensitic steel - Université de Lille Accéder directement au contenu
Article Dans Une Revue International Journal of Fatigue Année : 2020

Stability of fatigue cracks at 350 °C in air and in liquid metal in T91 martensitic steel

Résumé

The low cycle fatigue behaviour of a 9Cr1MoNbV martensitic steel has been investigated at 350 °C in air and inlead–bismuth eutectic (LBE) with low and high oxygen content. Total strain controlled tests were performed from Δεt=0.40% to 1.2%. The material exhibited a pronounced cyclic softening in both environments. LBE reduced the fatigue resistance. LBE accelerated the formation of the long crack by promoting the growth of the first short cracks. A clear change in propagation mode was observed. In air, ductile fatigue striations were observed while in LBE a brittle fracture decorated by voluminous and largely spaced striations were visible. From EBSD analysis, it was concluded that in LBE, the long crack advanced quickly by repeated and discontinuous cleavage.

Domaines

Matériaux
Fichier principal
Vignette du fichier
clean Revised_ paper_IJF.pdf (1.57 Mo) Télécharger le fichier
Origine Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-02310474 , version 1 (13-10-2020)

Identifiants

Citer

Jean-Bernard Vogt, Jeremie Bouquerel, Carla Carlé, Ingrid Proriol Serre. Stability of fatigue cracks at 350 °C in air and in liquid metal in T91 martensitic steel. International Journal of Fatigue, 2020, International Journal of Fatigue, ⟨10.1016/j.ijfatigue.2019.105265⟩. ⟨hal-02310474⟩
35 Consultations
93 Téléchargements

Altmetric

Partager

Gmail Mastodon Facebook X LinkedIn More