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| Effect of Si Content and Temperature on Oxidation Resistance of Fe-Si Alloys |
| Xiao-jiang LIU1,Yong-quan HE2,Guang-ming CAO2,Tao JIA2,Teng-zhi WU2,Zhen-yu LIU2 |
1. School of Mechanical Engineering, Shenyang University of Technology, Shenyang 110870, Liaoning, China
2. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, Liaoning, China |
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Abstract Hot-rolled Fe-(0.75-2.20)Si (mass%) alloys were oxidized in dry air at 600-1200 ��. The oxidation process was carried out by thermal gravimetric analysis (TGA). At 600-1150 ��, oxidation gain curves were approximately parabolic. Electron probe microanalysis (EPMA) was applied to investigate cross-section morphology of oxide layer and element distribution across the layer. At lower temperature of 700 ��, the oxide layer consisted of internal oxidation zone (IOZ), inner Si-rich layer (conglomerate of fayalite and magnetite) and outer hematite layer, while at higher temperature of 1200 ��, fayalite and wustite were observed in external oxide scale. Liquidus temperature of fayalite was detected by differential scanning calorimetry (DSC). Through comparing the oxidation mass gain and parabolic rate constant of the alloys, it was found that oxidation resistance of Fe-Si alloy was enhanced by increasing Si content below 1150 �� while increasing Si content of the alloy resulted in higher oxidation rate above 1150 �� owing to the liquid fayalite formation.
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Received: 25 November 2013
Published: 06 March 2015
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| Fund:The National High Technology Research and Development Program of China;National Natural Science Foundation of China;National Natural Science Foundation of China |
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Corresponding Authors:
Xiao-Jiang
E-mail: oxidescale@163.com
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2015, Vol. 22 
