|About this Abstract
|Materials Science & Technology 2020
|High Temperature Corrosion and Degradation of Structural Materials
|The Effect of Surface Treatment on the Formation, Structure, and Chemistry of Protective Oxide Scale on High-temperature Oxidation-resistant Nickel Alloys
|Stephen D. House, Henry O Ayoola, John Lyons, Meng Li, Bingtao Li, Judith C Yang, Wissam A Saidi, Brian Gleeson
|On-Site Speaker (Planned)
|Stephen D. House
High-temperature oxidation-resistant alloys often have finishes – such as polishing or vapor-blasting – applied to their exposed surfaces for aesthetic or practical reasons, which introduce deformation into the surface grain structure. Upon heating, a region of recrystallized grain structure can form at the surface. The degree and depth of the recrystallized zone depends on the type of surface finishing treatment, which in turn affects the extent of imposed surface deformation. Haynes 214® is a high-temperature oxidation-resistant nickel-aluminum-chromium-iron alloy that is known to form adherent alumina scales above 955 °C. Below this temperature, however, it can form either an alumina, chromia, or a combined oxide scale. In this work we employed surface (SEM, AFM) and subsurface (S/TEM, FIB) imaging and spectroscopic techniques to investigate the effect of various surface finishes on oxide scale formation and the surface and subsurface structure of the alloy resulting from the deformation and high-temperature oxidation processes.