High Temperature Oxidation of HfC-Containing Chromium-Rich Iron-Based Alloys - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Oxidation of Metals Année : 2014

High Temperature Oxidation of HfC-Containing Chromium-Rich Iron-Based Alloys

Patrice Berthod
Elodie Conrath
  • Fonction : Auteur
  • PersonId : 777429
  • IdRef : 195248384

Résumé

Three HfC-containing iron-based alloys were successfully elaborated by foundry. The alloys, all containing 25wt.%Cr, 0.25 or 0.50wt.%C and 3.7 to 5.6wt.%Hf, are characterized by a dendritic matrix and the presence of interdendritic script-like HfC carbides. These alloys were subjected to thermogravimetry test in air at 1200°C for 46 hours. The long exposure at this high temperature did not significantly modify the characteristics of the bulk HfC carbides. In contrast the presence of hafnium led to not parabolic oxidation kinetics and fast mass gain rates, by comparison with similar Hf-free ternary alloys. The scales formed all over the samples' surfaces were never composed exclusively of chromia and iron oxides or (iron, chromium) oxides were present in significant quantities. Some particles of hafnium oxides were also present in the external scales. A subsurface zone in which the HfC carbides were in situ replaced by hafnium oxides developed from the oxidation front. Catastrophic oxidation started in several locations and threatened to expand all around the samples beyond the stage duration. The high temperature oxidation behavior of these HfC-containing iron-based alloys appeared better than their cobalt-based homologues but worse than their nickel-based homologues, for the same conditions of oxidation test.
Fichier principal
Vignette du fichier
OxidationOfMetals2014vol82p33.pdf (1.06 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-02181311 , version 1 (12-07-2019)

Identifiants

Citer

Patrice Berthod, Elodie Conrath. High Temperature Oxidation of HfC-Containing Chromium-Rich Iron-Based Alloys. Oxidation of Metals, 2014, 82 (1-2), pp.33-48. ⟨10.1007/s11085-014-9475-6⟩. ⟨hal-02181311⟩
54 Consultations
73 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More