RESEARCH ARTICLE


Oxide Spallation During Post-isothermal High Temperature Oxidation Cooling of Cr-rich Cast Alloys Highly Alloyed with Hf



Elodie Conrath, Patrice Berthod*
Institute Jean Lamour, Department No 2: Chemistry and Physics of Solids and Surfaces, Team: Surface and Interface, Chemical Reactivity of Materials, Faculty of Sciences and Technologies, University of Lorraine, Vandoeuvre-lès-Nancy, France


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© Conrath and Berthod; Licensee Bentham Open

open-access license: This is an open access article licensed under the terms of the Creative Commons Attribution-Non-Commercial 4.0 International Public License (CC BY-NC 4.0) (https://creativecommons.org/licenses/by-nc/4.0/legalcode), which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.

* Address correspondence to this author at the Faculty of Sciences and Technologies, University of Lorraine, B.P. 70239, 54506 Vandoeuvre-lès-Nancy, France; Tel: 0033 383 68 46 66; E-mail: patrice.berthod@univ-lorraine.fr


Abstract

Cobalt, nickel and iron-based alloys containing 25wt.%Cr and strengthened either by chromium carbides or by HfC were oxidized at 1000, 1100 and 1200°C to obtain external oxide scales. The spallation of these oxides during the post-oxidation cooling was studied by exploiting the cooling part of the thermogravimetry curves. The best resistant alloys against scale spallation were the iron-based alloys which did not lose oxide. The nickel-based alloys well behaved too. The worst alloys were the cobalt alloys, principally due to the complex composition of the oxide scales. Beside the base element, the thickness of the oxide was also identified as a major parameter. The presence of Hf with contents much higher than usual was also beneficial for the resistance against spallation.

Keywords: Chromium, Cobalt alloys, Hafnium carbides, High temperature, Iron alloys, Nickel alloys, Oxidation, Scale spallation.