A comparison of the high-temperature oxidation behaviour of conventional wrought and laser beam melted Inconel 625

Nicolas Ramenatte (1) , Annabelle Vernouillet (2) , Stéphane Mathieu (1) , Aurélie Vande Put (2) , Michel Vilasi (1) , Daniel Monceau (2)

1 IJL - Institut Jean Lamour
2 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux

The microstructure and oxidation resistance of Laser Beam Melted (LBM) and Conventionally Manufactured (CM) Inconel 625 alloys were studied at 900 °C and 1050 °C. The microstructure of the LBM samples was cellular, with Nb and Mo segregations located at the cell walls. At 900 °C, the oxidation rate was similar for both materials but was clearly higher for the LBM material at 1050 °C. This high oxidation rate induced poor oxide scale compactness, void formation in the subsurface region and the formation of a high amount of Nb1.5Cr0.5O4 at the alloy-oxide interface.

Mots clés: A. Nickel; A. Superalloys; C. Selective oxidation

Domaines: Matériaux

Nicolas Ramenatte, Annabelle Vernouillet, Stéphane Mathieu, Aurélie Vande Put, Michel Vilasi, et al.. A comparison of the high-temperature oxidation behaviour of conventional wrought and laser beam melted Inconel 625. Corrosion Science, 2020, 164, pp.108347. ⟨10.1016/j.corsci.2019.108347⟩. ⟨hal-02972156⟩