Per: cássia de souza almeida (universidade federal fluminense), cláudio faria lopes junior (universidade federal fluminense), patrícia sousa nilo mendes (universidade federal fluminense), Erica Marcelino Freitas de SouzaSilva (universidade federal fluminense), ladário da silva (universidade federal fluminense)
Abstract:
Superalloys are nickel, iron-nickel or cobalt-based metal alloys used in industry when materials with better properties than conventional alloys are needed, from cryogenic to high temperatures. A-286 superalloy is a material capable of combining good corrosion resistance and excellent mechanical properties, especially at high temperatures, which guarantees its importance to the most diverse areas of Engineering. The aim of this paper was study the properties of an A-286 superalloy using the Confocal Microscopy technique for surface evaluation, in which roughness measurements were performed in addition to its topography, Optical Microscopy for microstructural analysis of the material, scanning electron microscopy for surface and compositional analysis and the Ellipsometry technique to obtain the optical properties of the surface. Through the low values found for roughness and topography survey, an excellent finish and good flatness on the surface of the samples was evidenced; the optical microscopy revealed the microstructure of an austenitic matrix with the presence of inclusions, while scanning electron microscopy allied to the EDS technique, the chemical composition of the superalloy was determined. Finally, through the ellipsometry technique, the ellipsometric parameters tan(Ψ) and cos(Δ) were obtained.