Long-term isothermal oxidation behavior of two industrial polycrystalline nickel base alloys in air at 700 °C – Evaluation of intergranular oxidation distribution and kinetic
| Autor: | Stéphane Mathieu, Michel Vilasi, S. Knittel, Lionel Aranda, R. Malacarne, Clara Desgranges |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
020209 energy General Chemical Engineering Kinetics Alloy Oxide 02 engineering and technology General Chemistry Intergranular corrosion engineering.material 021001 nanoscience & nanotechnology Isothermal process Chromia Corrosion chemistry.chemical_compound Chemical engineering chemistry 0202 electrical engineering electronic engineering information engineering engineering General Materials Science Crystallite 0210 nano-technology |
| Zdroj: | Corrosion Science. 188:109500 |
| ISSN: | 0010-938X |
| DOI: | 10.1016/j.corsci.2021.109500 |
| Popis: | Chromia forming Alloy 718 and AD730™ have been submitted to isothermal long-term air exposure up to 10 000 h at 700 °C. The resulting very low specific mass gain led to consider two alternatives to determine the oxidation kinetics. Measurements of the external layer thickness and of the intergranular oxide amount were carried out on SEM micrographs evidencing the intergranular oxidation contribute around 30% to the total specific mass change. AD730™ with a thicker external scale and a higher amount of intergranular oxide showed a twofold faster oxidation rate than Alloy718. The results demonstrated the need of even longer tests. |
| Databáze: | OpenAIRE |
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