OATAO - Open Archive Toulouse Archive Ouverte Open Access Week

On the Mutual Interaction between Mechanical Stresses and Internal Corrosion during Isothermal and Cyclic Oxidation of Nickel-Base Superalloys

Krupp, Ulrich and Orosz, Robert and Christ, Hans-Jürgen and Monceau, Daniel On the Mutual Interaction between Mechanical Stresses and Internal Corrosion during Isothermal and Cyclic Oxidation of Nickel-Base Superalloys. (2008) Materials Science Forum, vol. 595-598 . pp. 1023-1031. ISSN 0255-5476

[img]
Preview
(Document in English)

PDF (Author's version) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
1MB

Official URL: http://dx.doi.org/10.4028/www.scientific.net/MSF.595-598.1023

Abstract

Thermal cycling has been observed to cause a transition from superficial alumina formation to internal oxidation and nitridation, an effect that was shown to depend on the specimen thickness and geometry, which can be described by a spalling-probability model. Once protection by a dense and adherent alumina scale got lost, the internal-corrosion rate is determined by the diffusivity and solubility of nitrogen and oxygen in the alloy. These parameters seem to depend not only on the temperature and the alloy composition but also on the applied mechanical stress. Internal nitridation under a superimposed creep loading was found to follow a higher rate constant than under just isothermal exposure. This effect can probably be attributed to dislocation-pipe diffusion, a mechanism which has been claimed also to be relevant for outward solvent diffusion during internal corrosion, a phenomenon, which was observed as a stress-relief mechanism during various internal-reaction processes.

Item Type:Article
Additional Information:Thanks to Trans Tech Publications editor. The definitive version is available at http://www.scientific.net The original PDF of the article can be found at Materials Science Forum website : http://www.scientific.net/MSF/
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Other partners > Fachhochschule Osnabrück (GERMANY)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > Universität Siegen (GERMANY)
Other partners > VDEh-Betriebsforschungsinstitut - BFI (GERMANY)
Other partners > Institut für Werkstofftechnik (GERMANY)
Laboratory name:
Statistics:download
Deposited By: Celine Cabaup
Deposited On:23 Apr 2009 13:36

Repository Staff Only: item control page