Output details

Subsurface characterization of an oxidation-induced phase transformation and twinning in nickel-based superalloy exposed to oxy-combustion environments

For the next generation fossil fuel power plants it is of great importance to separate and sequester the CO2. Oxy-fuel combustion eliminates need of separation but turbine alloys are exposed to degradation conditions which are more extreme. In this study, Ni-based superalloys were oxidized in oxy-fuel combustion environment and the underlying alloy was found to be enriched in Ti and Ni which caused twinning and a new brittle phase which would in practice render this type of super alloys unsuitable for operation. The work has been made available to turbine manufacturers and the US DOE fossil Fuel Program (Dr Pete Rozelle, peter.rozelle@hq.doe.gov).