Abstract
Fe-40Cr-1Pd, Fe-40Cr-3Pd, Fe-40Cr-1Ru, and Fe-40Cr-3Ru alloys were oxidized in air at 900°C. The isothermal oxidation behavior of the alloys investigated was determined by using thermogravimetric (TG) techniques. Furthermore, the morphologies of the scales formed on the alloys were investigated by means of scanning electron microscopy, energy dispersive x-ray analyzer, and x-ray mapping. The TG results showed that 0.92 and 3.2 wt.% Pd additions to the Fe-40Cr alloy lead to a substantial decrease in the oxidation rate. However, the addition of 0.90 wt.% Ru to the Fe-40Cr alloy has little influence on the oxidation rate while a 3 wt.% Ru addition results in a slight decrease in the oxidation rate. The improved oxidation resistance of the Pd-containing Fe-40Cr alloys is attributed to Pd, which segregates to the oxide-alloy interface during elevated temperature oxidation and facilitates Cr diffusion.
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