The oxidation kinetics of a chromia forming development nickel-based superalloy over the temperature range of 700 to 850 °C under isothermal and 100 h thermal cycles are presented. The kinetics compare favourably with similar alloys and this is attributed to the formation of (Ti,Nb,Ta)(N,C,B) precipitates throughout the alloy. Between 840 and 850 °C a significant increase in the oxidation kinetics was observed; attributed to the dissolution of the precipitate phases, releasing titanium, tantalum and niobium into the alloy matrix. The results are discussed in terms of potential effect of the presence of (N,C,B) phases and stability on the oxidation kinetics.
- Minor elements
- Nickel-based alloy