[article]
Titre : |
High-temperature oxidation behaviour of model CoReCr alloys at low oxygen partial pressure |
Type de document : |
texte imprimé |
Auteurs : |
B. Gorr, Auteur ; S. Burk, Auteur ; V. B. Trindade, Auteur |
Année de publication : |
2011 |
Article en page(s) : |
pp. 741–747 |
Note générale : |
Génie mécanique |
Langues : |
Anglais (eng) |
Mots-clés : |
Cr2O3-scale high-temperature oxidation thermodynamic calculation |
Résumé : |
The oxidation behaviour of four model Co-Re-Cr alloys and a commercial Co-based alloy was investigated at 1000 °C and a low-oxygen partial pressure of p(O2) = 10−16 bar, in order to prove the feasibility of a pre-oxidation treatment. Under suitable conditions of the pre-oxidation treatment, the oxidation of the highly reactive alloying element Cr is possible. All the studied alloys form a continuous and dense Cr2O3 scale on the metal surface. The transport of chromium to the surface occurs mainly from the Cr-rich σ-phase, which becomes completely dissolved in the surrounding matrix after long exposure times. As a result of the Cr2O3 scale, growth depletion of Cr occurs in the near surface region, leading to internal oxidation. |
En ligne : |
http://onlinelibrary.wiley.com/doi/10.1002/maco.200905412/abstract |
in Materials and corrosion > Vol. 61 N° 9 (Septembre 2010) . - pp. 741–747
[article] High-temperature oxidation behaviour of model CoReCr alloys at low oxygen partial pressure [texte imprimé] / B. Gorr, Auteur ; S. Burk, Auteur ; V. B. Trindade, Auteur . - 2011 . - pp. 741–747. Génie mécanique Langues : Anglais ( eng) in Materials and corrosion > Vol. 61 N° 9 (Septembre 2010) . - pp. 741–747
Mots-clés : |
Cr2O3-scale high-temperature oxidation thermodynamic calculation |
Résumé : |
The oxidation behaviour of four model Co-Re-Cr alloys and a commercial Co-based alloy was investigated at 1000 °C and a low-oxygen partial pressure of p(O2) = 10−16 bar, in order to prove the feasibility of a pre-oxidation treatment. Under suitable conditions of the pre-oxidation treatment, the oxidation of the highly reactive alloying element Cr is possible. All the studied alloys form a continuous and dense Cr2O3 scale on the metal surface. The transport of chromium to the surface occurs mainly from the Cr-rich σ-phase, which becomes completely dissolved in the surrounding matrix after long exposure times. As a result of the Cr2O3 scale, growth depletion of Cr occurs in the near surface region, leading to internal oxidation. |
En ligne : |
http://onlinelibrary.wiley.com/doi/10.1002/maco.200905412/abstract |
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