Cyclic Oxidation Behavior of Conventional and Niobium-Modified MAR-M246 Superalloy at 900 and 1000 °C

Nickel-based superalloys have excellent properties at high temperatures, which makes them appropriate for applications such as turbocharges and aeronautic gas turbines. MAR-M246 is a superalloy developed these kinds of applications. The objective this work was to study the total replacement Ta by Nb in atomic percentage superalloy, regarding oxidation resistance. Although both elements same role (form γ’ precipitates) nickel-based superalloys, more expensive than Nb. Thus, leads possibility price reduction. This studied conventional MAR-M246(Ta) experimental MAR-M246(Nb) on cyclic tests 900 1000 °C up 180 cycles. oxide products were characterized SEM/EDS XRD analysis. mainly TiO2, Al2O3, Cr2O3, NiO, Ni(Co)Cr2O4. Mass gain variation per unit area stable materials temperatures. However, spalled areas detected performed °C. results obtained here suggest that use instead can be considered temperature superalloy.