New Alumina Forming Martensitic Steels

• The work presents a new category of alloys, Alumina Forming Martensitic (AFM) steels, developed for new clean energy power applications such as thermal solar power and Gen IV nuclear power. The aim was to combine the superior corrosion resistance of the alumina scale with the excellent creep properties of the martensitic structure. The alloys were exposed to liquid lead at 550°C for 1824 hours to evaluate their oxidation properties. In addition, the microstructures were analysed in annealed conditions and after the exposure to assess phase stabilities. Using a variety of characterisation techniques, the studies identified Al-rich oxides formed on the surfaces of both specimens after the exposure with no lead penetration. Moreover, martensite, NiAl precipitates, and different carbides were observed in both alloys.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Materialteknik -- Metallurgi och metalliska material (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering -- Metallurgy and Metallic Materials (hsv//eng)

Nyckelord

martensite

alumina

high temperature corrosion

liquid lead

oxidation

Publikations- och innehållstyp

vet (ämneskategori)

ovr (ämneskategori)