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Abstract
A series of oxidation tests were conducted for a nickel base superalloy, as these materials are used at high temperature in aggressive conditions, thus the influence of oxygen on their degradation mechanisms must be known. The material was treated for up to 150 h at 900 and 1000°C in a furnace able to control and maintain atmospheres with different partial oxygen pressures. The oxidation rate of the material was determined by gravimetric means. In all cases, the rate of oxidation followed parabolic regimes that depended on the value of oxygen partial pressure. The oxide scale formed was characterised by X-ray diffraction and scanning electron microscopy; these analyses revealed that the oxide scale consisted of an outer TiO2 layer and inner Cr2O3 layer under all experimental conditions. Cross-section analyses indicated the development of internal oxidation and the presence of gamma-prime free zones.
Acknowledgements
The authors would like to thank the German Research Foundation (Deutsche Forschungsgemeinschaft, DFG), the Mexican National Council for Science and Technology (Consejo Nacional de Ciencia y Tecnología, CONACYT), the Program for the Improvement of Professorship (Programa de Desarrollo del Profesorado, PRODEP) of the Mexican Ministry for Public Education (Secretaría de Educación Pública, SEP) and the Institute for Innovation and Technology Transfer (Instituto de Innovación y Transferencia de Tecnología, I2T2) of the Government of the State of Nuevo León for the support provided to this work.
ORCID
R. Colás http://orcid.org/0000-0001-6017-7244