Oxidation Characteristics of FexCr5Al Alloys Under Simulated Loss of Coolant Accident Condition
FexCr5Al(x=13,15,17,18,wt％)alloys were prepared and exposed to high temperature steam at 1000 and 1200℃ for 2 h.The high temperature oxidation behavior of the alloys was studied by a simultaneous thermal analyzer.The microstructure and composition of the oxide film after oxidation were analyzed by XRD,FIB,EDS and TEM.It is found that the oxidation kinetics of the alloys at two temperatures follow a parabolic growth law.The parabolic rate constants of the alloys are decreased with the increase in Cr content,and the high temperature steam oxidation resistance of the alloys are improved.The ridged oxide films mainly composed of α-Al2O3 are observed in the four alloys.In comparison with the low Cr alloy,the pores of the oxide film are reduced,and the bonding force of the oxide/matrix interface is improved in the high Cr alloy.Consequently,the compactness and adhesion of the oxide film are improved by increasing the Cr content,which promotes the formation of a dense Al oxide film and enhances the high temperature steam oxidation resistance of the alloy.
FeCrAl alloyhigh temperature steam oxidationmicrostructureoxide film
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