High temperature oxidation behavior of FeCrAl ferritic stainless steel
The high-temperature oxidation behavior of two ferritic heat-resistant stainless steels(C1 without Zr and C2 with Zr)was studied through isothermal oxidation tests in an atmospheric environment at 1 000,1 050,and 1 100 ℃ for 100 h.The surface,cross-sectional morphology,and phase composition of the oxidation layers of both steels were analyzed using X-ray diffraction,scanning electron microscopy,and energy dispersive spectroscopy.The experimental results indicate that the high-temperature oxidation kinetics curves of both alloys follow a parabolic law.Compared to the C1 alloy,the C2 alloy exhibited lower weight gain rates at all tested temperatures.The addi-tion of Zr did not alter the composition of the oxide film;both alloys formed oxide layers consisting of an inner Cr2O3 layer and an outer spinel oxide layer rich in Fe-Cr-Al-O.The C1 alloy experienced oxide film spallation at va-rious temperatures,with the most significant spallation observed at 1100 ℃.In contrast,the oxide film on the C2 alloy was dense and continuous,demonstrating excellent high-temperature oxidation resistance.The incorporation of Zr in the alloy enhances the adhesion between the oxide layer and the substrate,thereby improving the high-temper-ature oxidation resistance of FeCrAl·alloys.
ferritic stainless steelZrhigh-temperature oxidationoxidation kineticsoxide film
NETL
NSTL
万方数据
