High Temperature Oxidation of Centrifugally Cast, Heat-Resistant Alloys

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The research challenge to be addressed through the project involves an investigation of the steam oxidation performance of radiant tube alloys of interest to KUBOTA under well-controlled experimental conditions. It also involves an associated detailed surface analysis of the oxide scale formed using state-of-the-art analytical tools and instruments, namely site-specific sample preparation using focused ion beam (FIB) milling and high resolution electron microscopy and associated techniques. The site selectivity of the FIB sample preparation approach is absolutely critical given the heterogeneous microstructures that are intrinsic to the centrifugal casting process used by KUBOTA to manufacture the radiant tubes. The knowledge platform developed will support alloy development initially to ensure consistent, and ultimately to improve, oxide scale performance by elucidating the key kinetic and metallurgical factors that control the evolution of the oxide scale during the decoking process.