Comparative Study on Oxidation Behavior of Fe-5wt% Cr Alloy in Various Mixed Atmospheres at 900–1 000 °C
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The high-temperature oxidation behavior of Fe-5wt% Cr alloys was investigated in both N2+5vol% H2O and N2+21vol% O2+5vol% H2O atmospheres at 900–1000 °C for 120 min by the thermogravimetric analysis (TGA). The oxidation kinetics, phase composition and cross-sectional microstructure of the oxide scale were contrastively analyzed in both environments. Also, the phase composition of oxide scale was measured by X-ray diffraction (XRD). The cross-sectional microstructure and the interface elements distribution were studied by electron probe microanalysis (EPMA). The experimental results demonstrated that the growth rate and the mass gain of the oxide scale in the N2+5vol% H2O atmosphere were both significantly lower than the growth rate and the mass gain in the N2+21vol% O2+5vol% H2O atmosphere. The apparent layer structure of the oxide scale could be observed in an oxygen-enriched environment and did not appear in a pure water vapor without oxygen. In addition, the inner oxide layer growth mechanisms and the outward diffusion of the metal cations were introduced in the atmosphere of N2+5vol% H2O. Consequently, the effects of temperature and humid atmosphere on the Fe-Cr spinal scale evolution were also discussed.
Key wordsFe-5wt% Cr alloy humid environment oxidation kinetics oxide scale ionic diffusion
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