The oxidation performance of Cr2O3-forming commercial iron-nickel alloys at high temperature
- 1 May 1989
- journal article
- research article
- Published by Taylor & Francis in High Temperature Technology
- Vol. 7 (2) , 59-71
- https://doi.org/10.1080/02619180.1989.11753415
Abstract
The oxidation of commercial iron-nickel-base and nickel-base Cr203-forming alloys in oxygen under isothermal conditions at 800°C and lOOO°C has been investigated. Although the scales developed on Incoloy DS, Incoloy 800H, Incoloy 825 and Inconel 625 are reasonably protective, those on the first three alloys are partlcularly susceptl~le to failure on cooling. Intergranular oxidation is substantial and can be correlated wlth. the depth of chromium depletion in the subjacent alloy. Void formation at the alloy grau,,: boundaries is particularly severe for Incoloy DS. The roles of the varwus. minor alloymg additions manganese, titanium, silicon, aluminium, molybdenum and mobwm. are. considered and correlated with the overall oxidation process. Manganese and titanium can diffuse relatively rapidly across the scale to form new oxide on the scale. surface, while aluminium and silicon form internal oxides only. Molybdenum and niobium have little effect on the overall behaviour of Incoloy 825 and Inconel 625 under the present conditions.Keywords
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