Cyclic oxidation behavior of Fe-9Cr-1Mo steel in water vapor atmosphere

Abstract

The cyclic oxidation behavior of Fe-9Cr-1Mo steel (9Cr-1Mo) in 10%H₂O+90%Ar (volume fraction) atmosphere at 600, 650 and 700 for °C various time was studied. The oxidation mechanism of 9Cr-1Mo steel in 10%H₂O+90%Ar atmosphere was discussed. The thermal stress was evaluated in two oxide layers to illustrate the spallation of the oxide layer. The experimental results indicate that there exists a duplex oxide scale with an outer layer of Fe₂O₃ and an inner layer of mixed (Fe, Cr)₃O₄ formed on 9Cr-1Mo steel during cyclic oxidation. Some cracks generated in both inner and outer oxide layers. Parts of oxide scales spalled from substrate during the cyclic oxidation. A higher tensile stress in the oxide layer is formed at the early oxidation stage than at the later oxidation stage during heating. This tensile stress results in the formation of cracks in the oxide layer.

Keywords

Fe-9Cr-1Mo steel / water vapor / cyclic oxidation / crack

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