On the high-temperature oxidation behavior of a niobium-bearing high nickel-chromium alloy: microstructural evolution and implications on oxidation mechanisms
Source abstract
Abstract
The oxidation behavior of a niobium-bearing high nickel-chromium alloy, widely used in the petrochemical industry, is systematically studied at 800 °C using a combination of transmission electron microscopy and atom-probe tomography experimental techniques and thermodynamic calculations. Oxidation leads to complex surface microstructures consisting of a protective chromia layer, an amorphous SiO 2 (silica) layer, Fe- and Ni-rich metallic mushroom-like austenitic protrusions/precipitates, and sub-oxide voids with highly faceted surfaces. The thermodynamic equilibrium oxides of this alloy are studied as a function of oxygen activity using Thermo-Calc and compared to the observed microstructures. The growth kinetics of oxide layers are studied in detail.
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Research context
OpenAlex topics: Advanced Materials Characterization Techniques · High-Temperature Coating Behaviors · Advanced materials and composites
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