Abstract
This study investigated the high temperature oxidation behavior of Fe-22%Cr-5.8%Al alloy and the oxidation kinetics of the alloy were discussed. Bulk samples were prepared by VAM (vacuum arc melting) and hot forging. High temperature oxidation testes were isothermally conducted up to 100 hours in 79%<TEX>$N_2$</TEX>+21%<TEX>$O_2$</TEX> environment at three different temperatures (<TEX>$900^{\circ}C$</TEX>, <TEX>$1000^{\circ}C$</TEX>, <TEX>$1100^{\circ}C$</TEX>). The weight gain was measured after oxidation according to oxidation time (2, 4, 6, 8, 10, 15, 20, 25, 30, 60, 80, 100 hours). The weight gain significantly increased with increasing oxidation temperature. As the temperature increased, the oxidized samples showed sequential formation of <TEX>$Al_2O_3$</TEX>, Cr-rich oxide, Fe-rich oxide. The activation energy of high temperature oxidation was obtained as 306.63 KJ/mol. <TEX>$Al_2O_3$</TEX> were developed on the surface in the early stage of oxidation, representing protective role of oxidation. However, Fe-based and Cr-based oxides leaded to breakaway of oxide layer, thus resulted in the significant increase of additional oxidation.
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