ABSTRACT
The oxidation behaviour of two single crystal Ni-based superalloys has been investigated at 450°C and 550°C. Isothermal oxidation was carried out for varying times and it was found that exposure resulted in a sub-micrometre thick oxide. The external and internal oxide kinetics were studied via high-resolution image analysis and both showed sub-parabolic growth rates. Thermogravimetric tests indicated that the overall oxidation growth obeys a near quartic power law while parabolic kinetics can describe the transient oxidation period. Characterisation of the resulting oxides was carried out using electron microscopy, energy dispersive spectroscopy and X-ray diffraction. Results from thermodynamic modelling of the oxide formation are also presented to further assess the postulated mechanism of low-temperature oxidation in these Ni-based superalloys.
Acknowledgements
This work was supported by Uniper Technologies. Thanks are due to Rugby Labs – GE Power (formerly Alstom) for materials supply. The authors also would like to thank Dr Adriana Encinas-Oropesa and Dr Nigel Simms at Cranfield University for use of the TGA facilities, Dr Geoff West from Warwick University for access to the STEM-EDX and Dr Shan Jin from Thermo-Calc Software for the thermodynamic calculations.
Disclosure statement
No potential conflict of interest was reported by the authors.