Development of Simultaneous Corrosion Barrier and Optimized Microstructure in FeCrAl Heat-Resistant Alloy for Energy Applications. Part 1: The Protective Scale

© 2015, The Minerals, Metals & Materials Society. Coarse-grained Fe-based oxide dispersion-strengthened (ODS) steels are a class of advanced materials for combined cycle gas turbine systems to deal with operating temperatures and pressures of around 1100°C and 15–30 bar in aggressive environments, which would increase biomass energy conversion efficiencies up to 45% and above. This two-part paper reports the possibility of the development of simultaneous corrosion barrier and optimized microstructure in a FeCrAl heat-resistant alloy for energy applications. The first part reports the mechanism of generating a dense, self-healing α-alumina layer by thermal oxidation, during a heat treatment that leads to a coarse-grained microstructure with a potential value for high-temperature creep resistance in a FeCrAl ODS ferritic alloy, which will be described in more detail in the second part.G. Pimentel acknowledges the Spanish Ministerio de Ciencia e Inovación for financial support in the form of PhD research grant (FPI). The authors acknowledge financial support to Ministerio de Economia (MINECO) and Fondo Europeo de Desarrollo Regional (FEDER) in the form of ENE2009-13766-C04-01 project and MAT2013-47460-C5-2-P project.Peer Reviewe