Materials and Manufacturing Processes · 2015 · 29 citations · 20 references
EngineeringMaterials EngineeringMaterials ScienceMaterials ChemistryMetallurgyThermal AnalysisAlloy DesignAlloysHigh-temperature OxidationMetalsNickel-based SuperalloysOxidation ResistanceHigh-temperature Oxidation ResistanceMeltingNickel Alloy OxidationOxidationOxidation Of Nickel-based SuperalloysOxidation Of SuperalloysSuperalloysX-ray Diffraction Analysis
Ni-based superalloys with different contents of Nb addition were fabricated by vacuum melting and casting. High temperature oxidation behaviors of the designed alloys were investigated by thermogravimetry. Microstructure and phase constituent of the oxidation scales were studied using scanning electron microscope and X-ray diffraction (XRD), respectively. Results showed that irrespective of the composition, all specimens obeyed the parabolic law during different stages. The scales on specimens B and C with 2.0 wt.% and 2.5 wt.% Nb addition, respectively, were mainly comprised of Cr2O3 and NiCr2O4. However, specimen A, with no Nb addition showed only NiO in the outer scale. The oxidation scales all exhibited a layered structure. With 2.0 wt.%Nb addition, the superalloy's high temperature oxidation resistance was enhanced by about 25%.
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