Abstract.
The oxidation in air under isothermal conditions of Inconel 718 has been investigated at 900 °C. We have studied the firsts stages of the high temperature oxidation mechanism. The oxidised samples were examined using a number of surface analytical techniques including XPS and SEM-EDS. The results have shown that minor alloying elements strongly influence the oxidation behaviour of the alloy:
Previous studies had shown that the rate of the external oxide scale growth and the intergranular oxide penetration during oxidation of Inconel 718 at 900 °C in air are lower than those of Inconel X or Incoloy 800. We suggest that the formation of a quasi continuous scale of the intermetallic phase Ni3Nb at the oxide-alloy interface could have an important contribution to the good oxidation resistance of Inconel 718.
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Delaunay, F., Berthier, C., Lenglet, M. et al. SEM-EDS and XPS Studies of the High Temperature Oxidation Behaviour of Inconel 718. Mikrochim Acta 132, 337–343 (2000). https://doi.org/10.1007/s006040050027
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DOI: https://doi.org/10.1007/s006040050027