Authors:
Facundo Masari (Universidad Carlos III de Madrid, Spain),
Luis Antonio Diaz-Rodriguez (Nanomaterials and Nanotechnology Research Centre, Spain),
Jose M. Torralba (Universidad Carlos III de Madrid|IMDEA Materials Institute, Spain)
Abstract:
It is possible to increase the operating pressure and temperature of power plants to improve efficiency and reduce CO2 emissions per unit of the generated electricity. To accomplish this, new materials must be identified to resist high-temperature corrosion. As an alternative to commercial Alumina-Forming-Austenitic (AFA) steels, new alumina-forming ferritic-martensitic or plain martensitic steels with nano-precipitates are studied. Their significant corrosion resistance is attributed to the formation of a protective Al2O3 layer. This makes it possible to be used at higher temperatures and for longer periods than conventional stainless steels that form a Cr2O3 surface layer. Based on thermodynamic simulations, two promising compositions, Fe-14.5Cr-12Ni-3.5Al and Fe-13Cr-10.5Ni-3.5Al were selected. Once atomized, were consolidated by field-assisted sintering techniques. Oxidation behaviour at high temperatures and experiments at lower temperatures and longer times have been performed at operating temperatures of around 750 °C. The further nano-precipitation of MX particles will provide a mechanical behaviour advantage.
DOI:
https://doi.org/10.59499/WP225371630