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Microstructural investigation of the oxide formed on TP 347H FG during long-term steam oxidation / A. N. Hansson in Materials and corrosion, Vol. 61 N° 8 (Août 2010) 

Public ISBD [article]  in Materials and corrosion > Vol. 61 N° 8 (Août 2010) . - pp. 665–675 Titre : Microstructural investigation of the oxide formed on TP 347H FG during long-term steam oxidation Type de document : texte imprimé Auteurs : A. N. Hansson, Auteur ; H. Danielsen, Auteur ; F. B. Grumsen, Auteur Année de publication : 2010 Article en page(s) : pp. 665–675 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Austenitic  18–12  stainless  steel;  Cr  diffusion;  internal  oxidation;  steam  oxidation Résumé : The long-term oxidation behaviour of TP347H FG in ultra supercritical steam conditions was assessed by exposing the steel in test superheater loops in a Danish coal-fired power plant and characterising the oxide layer with reflective light and electron microscopy. Double layered oxide scales formed during steam oxidation. TEM investigations reveal that the inner oxide layer consists of particles of metallic Ni/Fe and FeCr spinel in the interior of the former alloy grains and a compact layer of FeCr spinel and Cr2O3 along the former alloy grain boundaries. The morphology suggests that the inner layer grows by internal oxidation of the interior of the alloy grains. The thickness of the inner oxide layer did not change significantly with oxidation time and temperature for exposure times up to 30 000 h. Faster Cr diffusion within the fine-grained alloy at higher temperatures is held responsible for this observation. This hypothesis is supported by kinetic data. The oxide thickness at low and high temperatures after 58 000 h exposure was higher than expected. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905439/abstract [article] Microstructural investigation of the oxide formed on TP 347H FG during long-term steam oxidation [texte imprimé] / A. N. Hansson, Auteur ; H. Danielsen, Auteur ; F. B. Grumsen, Auteur . - 2010 . - pp. 665–675. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 8 (Août 2010) . - pp. 665–675 Mots-clés : Austenitic  18–12  stainless  steel;  Cr  diffusion;  internal  oxidation;  steam  oxidation Résumé : The long-term oxidation behaviour of TP347H FG in ultra supercritical steam conditions was assessed by exposing the steel in test superheater loops in a Danish coal-fired power plant and characterising the oxide layer with reflective light and electron microscopy. Double layered oxide scales formed during steam oxidation. TEM investigations reveal that the inner oxide layer consists of particles of metallic Ni/Fe and FeCr spinel in the interior of the former alloy grains and a compact layer of FeCr spinel and Cr2O3 along the former alloy grain boundaries. The morphology suggests that the inner layer grows by internal oxidation of the interior of the alloy grains. The thickness of the inner oxide layer did not change significantly with oxidation time and temperature for exposure times up to 30 000 h. Faster Cr diffusion within the fine-grained alloy at higher temperatures is held responsible for this observation. This hypothesis is supported by kinetic data. The oxide thickness at low and high temperatures after 58 000 h exposure was higher than expected. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905439/abstract