Oxidation of Heat-Resistant Fe-Base Incoloy 800 Alloy

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The oxidation behavior of the heat-resistant Fe-base alloy Incoloy 800 has been investigated in the vicinity of 1000°C under oxygen pressures ranging from 1×10−4 to 2×10−1 atm. The rate of oxidation has been determined by the weight gain using a Cahn RG Electrobalance. Metallographic, electron microprobe and X-ray diffraction studies of the oxidized specimens have been carried out. The rate of oxidation is parabolic but tends to slightly decrease with the progress of oxidation. Cold rolling of the specimen accelerates the rate of oxidation. The dependence of the oxidation rate upon oxygen pressure is slightly smaller than that theoretically expected for the scale of pure Cr2O3. The oxidized specimen has a layer structure of the outer porous scale, the inner dense scale, the complicated scale-substrate interface region and the internally-oxidized substrate in sequence from the outer side. The outer scale is principally composed of oxides of Cr and Mn, but it also contains smaller quantities of oxides of Ti, Fe, Ni etc. Oxygen partial pressure of the reaction affects the composition of the outer scale. The inner scale is principally composed of Cr2O3. Most of the oxides of Al and Si are present in the scale-substrate interface region and the internally-oxidized substrate region. The existence ratio of the spine1 phase against the rhombohedral phase in the outer part of scale considerably increases with the progress of oxidation.

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