Metal dusting is a high-temperature corrosion process which attacks several materials in strongly carburising atmospheres. Fundamental studies on the thermodynamics and kinetics of phase transformations during metal dusting are performed on pure iron and also on iron-based alloys. Metastable phases such as Fe3C and Fe5C2 grow and decompose under metal dusting conditions. Making use of this situation studies on the growth kinetics of carbides on pure iron and also on iron-based alloys are performed. At 800 °C the growth of an austenite layer is observed. The experimental results are compared with DICTRA simulations. By carburising diffusion couples of Fe-X (X = Mo, Cr, V, Si) the effect of ternary additions X on the growth kinetics of cementite can be studied.