Design Of Alumina Forming Martensitic Steels For Power Generation Systems By Powder Metallurgy

Authors:

Masari Facundo (1), Hernández Pascual Rebeca (2), Hernández Mayoral M. Mercedes (2), Torralba José Manuel (2,3), Campos Mónica (2)

1- Universidad Carlos III de Madrid, Leganés Madrid, Spain

2- Centre for Energy, Environmental and Technological Research (CIEMAT), Madrid, Spain

3- IMDEA Materials Institute, Getafe Madrid, Spain

Abstract:

Increasing the operating pressure and temperature of power plants is one method to increase their efficiency and hence lower CO2 emissions. The materials employed define the maximum operating parameters of a plant, ergo, it is crucial to develop new materials to raise its working conditions. Currently, alumina-forming austenitic steels), alloys vulnerable to stress corrosion cracking and irradiation swelling, are one of the materials used for temperatures about 750°C. A novel type of material is proposed, alumina-forming ferritic-martensitic steels, which have superior corrosion and swelling resistance. Advanced fabrication techniques like field-assisted sintering and selective laser melting are explored to achieve different microstructures, starting from pre-alloyed atomized powders. These microstructures were studied with SEM and EBSD, while their mechanical behaviour was observed at room temperature. Finally, corrosion tests were conducted at temperatures of 800°C for 500 hours.

DOI:

https://doi.org/10.59499/EP235765533