Investigation of breakaway oxidation kinetics of nickel-base single crystal superalloys: Modeling and experiments
MATERIALS TODAY COMMUNICATIONS(2022)
摘要
Varied oxidation behaviors at 1100 degrees C were investigated in six nickel-base single crystal superalloys. Thereinto, breakaway oxidation shows a feature of continuously increased oxidation rate, contrary to the typical parabolic theory. Predicated on parabolic oxide-layer growth and a constant spalling area fraction, we proposed a kinetics model to simulate the iterative scale growth and spallation process on the surface of superalloys. Our findings revealed that the breakaway oxidation behavior corresponds to accelerated weight-gain rate and is mechanistically attributed to continuous spallation of oxide layers. Based on our and previous research, a typical isothermal oxidation process can be defined as four stages: initial linear stage, parabolic stage, accelerated oxidation stage and dynamic-balance stage.
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关键词
Breakaway oxidation, Spalling model, Kinetics, Superalloys
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