Abstract
A Nimonic 263 alloy, widely used for combustion chamber applications in aeroengines, was exposed to air at 1020 °C to study the oxidation-creep interaction at 780°C in the stress range of 160–275 MPa. Prior exposure of the alloy led to degradation of creep properties, resulting in enhanced creep rate, poor rupture lifetime and creep ductility embrittlement. Degradation of creep properties in the air-exposed alloy has been discussed in terms of oxygen-induced damage in the grain boundary due to the formation of CO gas bubbles and the depletion of γ' in the near-surface region.
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