High Temperature Oxidation of Centrifugally Cast, Heat-Resistant Alloys

该项目面临的研究挑战包括对KUBOTA感兴趣的辐射管合金在良好控制的实验条件下的蒸汽氧化性能的研究。它还涉及使用最先进的分析工具和仪器对氧化垢进行相关的详细表面分析，即使用聚焦离子束（FIB）铣削和高分辨率电子显微镜及相关技术进行特定地点的样品制备。考虑到KUBOTA制造辐射管的离心铸造工艺所固有的异质显微结构，FIB样品制备方法的选择性是绝对关键的。开发的知识平台将通过阐明在脱焦过程中控制氧化垢演变的关键动力学和冶金因素，初步支持合金开发，以确保一致，并最终改善氧化垢性能。

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.