Influence of Micro-Structure on Oxidation Behavior of a Ni-Based Superalloy at 1000°C

Abstract:

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The isothermal and cyclic oxidation behaviors of a Ni-based superalloy with singlecrystalline (SC), polycrystalline and nanocrystalline (NC) structures were studied at 1000°C. Results indicated that a uniform oxides scale consisted of external Cr2O3 with little TiO2 and internal continuous Al2O3 formed on SC alloy. A non-uniform external oxide of which some locations were nodule-like scale was formed on surface of cast alloy. The nodule-like parts consisted of TiO2, Cr2O3 and serious internal oxidation of Al, and rest flat surface was a Cr2O3 and Al2O3 layer. A continuous Al2O3 layer formed on the sputtered NC coating. The micro-structure influenced the oxidation mechanism and resulted in different oxide scale formed on three materials, which greatly influenced materials’ oxidation and cyclic-oxidation resistance.

Info:

Periodical:

Materials Science Forum (Volumes 595-598)

Edited by:

Pierre Steinmetz, Ian G. Wright, Alain Galerie, Daniel Monceau and Stéphane Mathieu

Pages:

87-94

DOI:

10.4028/www.scientific.net/MSF.595-598.87

Citation:

L. Liu et al., "Influence of Micro-Structure on Oxidation Behavior of a Ni-Based Superalloy at 1000°C ", Materials Science Forum, Vols. 595-598, pp. 87-94, 2008

Online since:

September 2008

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$35.00

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