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| High temperature oxidation behavior of Fe-2.2%Si steel in different atmosphere |
| CAO Guang-ming1, SHAN Wen-chao1, LIU Xiao-jiang2, WANG Chen-yang1 |
1. The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, Liaoning, China;
2. College of Mechanical Engineering, Shenyang University of Technology, Shenyang 110870, Liaoning, China |
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Abstract In order to explore the compound effect and mechanism of Si elements and heating process parameters(atmosphere,temperature and time) on the formation of oxide scale on the surface of Fe-2.2%Si steel,the high temperature oxidation behavior of Fe-2.2%Si steel under the condition of dry air and water vapor was studied by thermogravimetric analyzer(TGA). The oxidation rate constant and oxidation activation energy were calculated by using the oxidation weight gain data obtained from the experiment. The kinetic model of oxidation was established. In addition,the growth mechanism and nodulation mechanism of oxide scale in two kinds of atmosphere were clarified. The experimental results show that the oxidation weight gain curves obtained under different oxidation atmospheres are in accordance with the parabola law. When there is water vapor in the oxidation atmosphere,the oxidation rate of the experimental steel increases and the oxidation activation energy decreases,which leads to the increase of oxidation weight of the experimental steel. Under two kinds of oxidation atmosphere,the oxide scale of the experimental steel is composed of oxide scale and the Si-rich layer at the interface between the oxide scale and the matrix,but the Si-rich layer of the experimental steel obtained under water vapor is loose and porous,and there are a large number of voids and microcracks in the oxide scale. The oxidation mechanism is mainly due to the growth stress during the growth of oxide scale and the existence of water vapor,which leads to the outward diffusion of H2,resulting in a large number of holes and cracks in the oxide scale, which provides a channel for the diffusion of oxidation medium and is beneficial to the diffusion of gas phase materials. and then promote the oxidation behavior of the experimental steel. In addition,the Si-rich layer formed at the interface between the oxide scale and the matrix consumes the Si elements in the matrix,resulting in a poor Si zone on the surface of the matrix,and the oxidation medium can contact the matrix directly through the holes and cracks in the oxide scale,so that the oxidation rate of the matrix in this area increases rapidly,the thickness of the oxide scale increases rapidly,and the nodulation shape is gradually formed.
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Received: 17 February 2022
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2022, Vol. 57 
