Microstructural Effects on the Corrosion Behavior of Alloys and Ceramics; Final rept. Jun 2006-Jun 2008

摘要

The objective of this research was to investigate the effect of microstructure on the corrosion behavior of metals and ceramics. Representative materials from the important engineering alloys and ceramics were studied to determine their corrosion behavior in supercritical water and during cyclic oxidation in air. The materials included Incoloy alloy 800H, Inconel alloy 617, 12%Cr ferritic-martensitic steel HCM12A, and silicon carbide fabricated by means of chemical vapor deposition (CVD). The study focused on the effect of the microstructure such as grain boundary networks, grain size, and residual strains on the corrosion behavior of these materials. Novel grain boundary engineering and commercial shot-peening were employed to adjust the grain boundary character distribution of the metals and refine the surface grain size of alloy 800H, respectively. The effect of residual strains generated from the CVD processing was studied for SiC.