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High-temperature oxidation behaviour of model CoReCr alloys at low oxygen partial pressure / B. Gorr in Materials and corrosion, Vol. 61 N° 9 (Septembre 2010) 

Public ISBD [article]  in Materials and corrosion > Vol. 61 N° 9 (Septembre 2010) . - pp. 741–747 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 [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