Effect of aluminium and silicon on high temperature oxidation resistance of Fe-Cr-Ni heat resistant steel |
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| Authors: | Haitao Wang Qi Zhao Huashun Yu Zhenya Zhang Hongwei Cui Guanghui Min |
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| Institution: | 1. Key Laboratory of Liquid Structure and Heredity of Materials of Ministry of Education, School of Materials Science and Engineering, Shandong University, Jinan 250061, China
2. Key Laboratory of Liquid Structure and Heredity of Materials of Ministry of Education, School of Materials Science and Engineering, Shandong University, Jinan 250061, China;School of Materials Engineering, Yantai Nanshan University, Yantai 265706, China |
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| Abstract: | Fe-Cr-Ni heat resistant steels with different contents of Al and Si were cast in intermediate frequency induction furnace with non-oxidation method. With oxidation weight gain method, the oxidation resistance of test alloys was examined at 1 200℃ for 500 h. The effects of Al and Si on oxidation resistance were studied through analyses of X-ray diffraction (XRD) and scanning electron microscope (SEM). It is shown that the composition of oxide scales is a decisive factor for the oxidation resistance of heat resistant steels. The compounded scale composed of Cr2O3, ar-Al2O3, SiO2 and Fe(Ni)Cr2O4, with flat and compact structure, fine and even grains, exhibits complete oxidation resistance at 1 200℃ Its oxidation weight gain rate is only 0.081 g/(m2·h). By the criterion of standard Gibbs formation free energy, a model of nucleation and growth of the compounded scale was established. The formation of the compounded scale was the result of the competition of being oxidated and reduction among Al, Si, and the matrix metal elements of Fe, Cr and Ni. The protection of the compounded scale was analyzed from the perspectives of electrical conductivity and strength properties. |
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| Keywords: | heat resistant steel oxide scale oxidation resistance |
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