| Abstract Scope |
High temperature alloys rely on the formation of a protective oxide scale to resist high temperature oxidation attack, but the capability of an oxide scale to resist oxidation could vary upon oxidation conditions. Many industrial processes are operated in harsh environments, such as mixed gas atmosphere and severe thermal cycling, and it is very important to evaluate alloy performance under different testing conditions. This presentation summarizes high temperature oxidation behaviors of commercial high temperature alloys, focusing on Ni- and Co-base alloys, under various testing conditions, including short-term and long-term oxidation, cyclic oxidation, dynamic (burner rig) oxidation, and water vapor oxidation at temperatures from 871 to 1149 °C (1600 to 2100°F). Experimental results are analyzed and discussed, and in most cases, alumina scale was significantly superior to chromia scale for oxidation resistance in terms of slow oxidation kinetics, scale stability and adhesion, oxide vaporization reduction, mass penetration suppression, etc. |