First approach for thermodynamic modelling of the high temperature oxidation behaviour of ternary γ′-strengthened Co–Al–W superalloys |
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| Affiliation: | 1. Department of Materials Science and Engineering, Institute for Surface Science and Corrosion, University of Erlangen-Nürnberg, Martensstr. 7, 91058 Erlangen, Germany;2. Interdisciplinary Centre for Advanced Materials Simulation (ICAMS), Ruhr-University Bochum, Universitätsstr. 150, 44801 Bochum, Germany;1. School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon, 16419, South Korea;2. Gas Turbine Materials Group, Structures, Materials and Manufacturing Lab, Aerospace Portfolio, National Research Council of Canada, Ottawa, K1A 0R6, Ontario, Canada;3. Titanium Alloys Department, Korea Institute of Materials Science, Changwon, 51508, South Korea;1. Key Laboratory of Thermal Fluid Science and Engineering of MOE, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, PR China;2. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0245, USA;1. Centre for Advanced Materials Joining, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada;2. Department of Mechanical Engineering, Tsinghua University, Beijing, China;1. Institut Jean Lamour, University of Lorraine, BP 70239, 54506 Vandoeuvre-lès-Nancy, France;2. Faculty of Sciences and Technologies, University of Lorraine, BP 70239, 54506 Vandoeuvre-lès-Nancy, France;1. Materials Science and Engineering, Institute for Surface Science and Corrosion, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Martensstr. 7, Erlangen, Germany;2. DECHEMA-Forschungsinstitut, Theodor-Heuss-Allee 25, Frankfurt am Main, Germany;3. Materials Science and Engineering, Institute I, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Martensstr. 5, Erlangen, Germany |
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| Abstract: | In the present work, thermodynamic modelling of the high temperature oxidation behaviour of a γ′-strengthened Co-base superalloy is presented. The ternary Co–9Al–9W alloy (values in at%) was isothermally oxidised for 500 h at 800 and 900 °C in air. Results reveal that the calculated oxide layer sequence (Thermo-Calc, TCNI6) is in good agreement with the formed oxide scales on the alloy surface. Furthermore, prediction of the influence of oxygen partial pressure on Al2O3 formation is presented. The modelling results indicate pathways for alloy development or possible pre-oxidation surface treatments for improved oxidation resistance of the material. |
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| Keywords: | A Superalloys B Modelling studies B SEM C Oxidation |
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