| In this paper,Fe-0.2Si Steel,Fe-1Si Steel,Fe-2Si Steel were used as research object of experiment.The law of oxidation weight gain was measured over time and oxidation activation energy was calculated from oxidation kinetics experiments by Thermo Gravimetric Analyzer（TGA）in water vapor,then the anti-oxidation of experimental steels was compared.The structure of oxide scales was observed and analyzed.The content of Si and oxidation time were discussed with the influence of the oxide thickness and structure from the high temperature oxidation experiments with tube type heating furnace.The internal organization of substrate and thickness were observed and analyzed.The experimental conclusions are as follows:The mass gain of per unit of Fe-0.2Si steel and Fe-2Si steel increase with the rise of temperature after 120min in water vapor at 900℃,1000℃,1100℃,1200℃.The mass gain of per unit of Fe-0.2Si steel is more than Fe-2Si Steel at 900℃,1000℃,1100℃.Fe-0.2Si steel mass gain of per unit is less than Fe-2Si steel because Fe2SiO4phase come up liquidation at 1200℃.The oxidation activation energy of Fe-2Si steel is bigger than Fe-0.2Si steel by calculating.Therefore,the anti-oxidation of Fe-2Si Steel is greater than Fe-0.2Si Steel.Fe-0.2Si Steel and Fe-2Si Steel mass gain of per unit and time are from the linear relations to parabola relationship.The thickness of same type steel scales become large After 60 min high temperature oxidation in air,And the sequence of anti-oxidation is from strong to weak.In the whole scale,Si and Cr element enrichment is near the substrate.Other areas are mainly iron oxides.The three types of steels have a phenomenon of internal oxidation,and the internal oxidation layer is mainly composed of Fe,SiO2,Cr2O3.The SiO2 and Cr2O3 are distributing in the surface of steel substrate.And with the increase of Si content,enlarges the particle size of the internal oxidation layer. |
