High -Temperature short term / in situ oxidation behaviour of Haynes-230 at 1200 °C

Abstract

The reliability and oxidation kinetics behaviour of the Haynes-230 alloy used in hot combustion components for very long-term applications are of great interest to researchers. To recreate the real-time environment, the in situ surface oxidation behaviour of Haynes-230 alloy at high temperature exposures (800, 1000, and 1200°C) is studied in a customized furnace setup equipped with electrochemical impedance spectroscopy (EIS). The heat-treated samples' phase analysis, surface morphology, and chemical composition were evaluated using X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS). The various forms of surface oxide layer formation were investigated using Raman spectroscopy. The EIS method was also utilized to evaluate the oxidation behaviour of Haynes-230 at various temperatures and time durations. Furthermore, the oxidation kinetics were investigated under thermal loading and unloading conditions, and capacitive behaviour was observed under unloading conditions.