Abstract
Electron backscattered diffraction (EBSD) maps acquired in the diffusion zone of aluminised Super 304H steel samples showed that a phase change and associated grain growth phenomena had occurred during high temperature aging in flowing steam environments. This phase transformation could have a significant influence on reducing the oxidation resistance and mechanical stability of the aluminised layer at high temperatures. Scanning electron microscopy combined with energy dispersive X-ray spectroscopy and EBSD mapping provides a valuable insight into microstructural changes occurring in coated alloy systems during high temperature aging processes.
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