Metal dusting corrosion of austenitic alloys at low and high pressure with the effects of Cr, Al, Nb and Cu

Aurélien Fabas (1) , Aurélie Rouaix-Vande Put (1) , Sébastien Doublet (2) , Didier Domergue (2) , Mehdi Salem (3) , Daniel Monceau (1)

1 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
2 Air Liquide [Siège Social]
3 ICA - Institut Clément Ader

Commercial and model alloys were exposed at 570 degrees C to metal dusting conditions at 1 and 21 bar in CO-H-2-H2O and CO-H-2-CO2-CH4-H2O atmospheres, respectively, with similar a(c) and P-O2 center dot gamma `' precipitation beneath the surface of 625 superalloy was due to Nb diffusion toward the Cr-depleted zone formed during oxidation. 693 superalloy was more carburised than 690 superalloy. alpha-Al2O3 formation was believed to induce cracks through the oxide scale, resulting in the alloy carburisation. Cu addition to a FeNiCr model alloy lead to the formation of an almost continuous Cu layer at the oxide/metal interface, greatly improving the metal dusting resistance.

Mots clés: Carburization; Oxidation; Superalloys; High temperature corrosion

Domaines: Sciences de l'ingénieur [physics]

Aurélien Fabas, Aurélie Rouaix-Vande Put, Sébastien Doublet, Didier Domergue, Mehdi Salem, et al.. Metal dusting corrosion of austenitic alloys at low and high pressure with the effects of Cr, Al, Nb and Cu. Corrosion Science, 2017, 123, p. 310-318. ⟨10.1016/j.corsci.2017.04.015⟩. ⟨hal-01620033⟩