High-temperature oxidation behavior of 9Cr-5Si-3Al ferritic heat-resistant steel
来源期刊：International Journal of Minerals Metallurgy and Materials2020年第9期
论文作者：Jun-jun Yan Xue-fei Huang Wei-gang Huang
文章页码：1244 - 1250
摘 要：To improve the oxidation properties of ferritic heat-resistant steels,an Al-bearing 9Cr-5Si-3Al ferritic heat-resistant steel was designed.We then conducted cyclic oxidation tests to investigate the high-temperature oxidation behavior of 9Cr-5Si and 9Cr-5Si-3Al ferritic heat-resistant steels at 900 and 1000℃.The characteristics of the oxide layer were analyzed by X-ray diffraction,scanning electron microscopy,and energy dispersive spectroscopy.The results show that the oxidation kinetics curves of the two tested steels follow the parabolic law,with the parabolic rate constant kp of 9Cr-5Si-3Al steel being much lower than that of 9Cr-5Si steel at both 900 and 1000℃.The oxide film on the surface of the 9Cr-5Si alloy exhibits Cr2MnO4 and Cr2O3 phases in the outer layer after oxidation at 900 and 1000℃.However,at oxidation temperatures of 900 and 1000℃,the oxide film of the 9Cr-5Si-3Al alloy consists only of Al2O3 and its oxide layer is thinner than that of the 9Cr-5Si alloy.These results indicate that the addition of Al to the 9Cr-5Si steel can improve its high-temperature oxidation resistance,which can be attributed to the formation of a continuous and compact Al2O3 film on the surface of the steel.
Jun-jun Yan，Xue-fei Huang，Wei-gang Huang
College of Materials Science and Engineering,Sichuan University
摘 要：To improve the oxidation properties of ferritic heat-resistant steels,an Al-bearing 9Cr-5Si-3Al ferritic heat-resistant steel was designed.We then conducted cyclic oxidation tests to investigate the high-temperature oxidation behavior of 9Cr-5Si and 9Cr-5Si-3Al ferritic heat-resistant steels at 900 and 1000℃.The characteristics of the oxide layer were analyzed by X-ray diffraction,scanning electron microscopy,and energy dispersive spectroscopy.The results show that the oxidation kinetics curves of the two tested steels follow the parabolic law,with the parabolic rate constant kp of 9Cr-5Si-3Al steel being much lower than that of 9Cr-5Si steel at both 900 and 1000℃.The oxide film on the surface of the 9Cr-5Si alloy exhibits Cr2MnO4 and Cr2O3 phases in the outer layer after oxidation at 900 and 1000℃.However,at oxidation temperatures of 900 and 1000℃,the oxide film of the 9Cr-5Si-3Al alloy consists only of Al2O3 and its oxide layer is thinner than that of the 9Cr-5Si alloy.These results indicate that the addition of Al to the 9Cr-5Si steel can improve its high-temperature oxidation resistance,which can be attributed to the formation of a continuous and compact Al2O3 film on the surface of the steel.
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