Kinetic oxidation model including the transient regime for a single crystal nickel-based superalloy over the temperature range 750–1300 °C
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authors
keywords
- AM1
- Superalloy
- High temperature oxidation
- Transient oxidation
- Oxidation kinetics
abstract
The oxidation behavior of the Ni-base single-crystal superalloy AM1 was investigated over the temperature range 750–1300 °C. The use of stepwise multi-temperature thermogravimetric analysis (SMT-TGA) showed the presence of a transient regime. This transient regime can be modeled by the initial formation of a fast-growing mixed oxide and then by the formation of α-alumina gradually covering the metal/oxide interface. This model helps to determine the time required for AM1 alloy to be out of the transient regime. Then, the model makes it possible to predict any oxidation kinetics of the AM1 superalloy for the entire temperature range studied.
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