Effect of Si Content and Temperature on Oxidation Resistance of Fe-Si Alloys
Effect of Si Content and Temperature on Oxidation Resistance of Fe-Si Alloys
复制标题
Si含量和温度对Fe-Si合金抗氧化性能的影响
DOI：
10.1016/s1006-706x(15)60036-x
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发表时间：
2015-03-01
影响因子：
2.5
通讯作者：
Liu, Zhen-yu
中科院分区：
文献类型：
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作者：
Liu, Xiao-jiang;He, Yong-quan;Liu, Zhen-yu
采用热重分析（TGA）对热轧Fe-(0.75 ~ 2.20)Si（质量%）合金在600 ~ 1200℃的干燥空气中进行氧化。在600-1150℃时，氧化增益曲线近似抛物线。采用电子探针显微分析（EPMA）研究了氧化层的截面形貌和元素在氧化层上的分布。在较低温度700℃时，氧化层由内氧化带（IOZ）、内富硅层（铁矾石和磁铁矿的砾岩）和外赤铁矿层组成，而在较高温度1200℃时，氧化层由铁矾石和浮士体组成。用差示扫描量热法（DSC）测定了沸石的液相温度。通过对比合金的氧化质量增益和抛物线速率常数，发现在1150℃以下增加Si含量可以增强Fe-Si合金的抗氧化性，而在1150℃以上，由于形成了液态的铁矾石，增加Si含量可以提高合金的氧化速率。
Hot-rolled Fe-(0.75-2.20)Si (mass%) alloys were oxidized in dry air at 600-1200 degrees C. The oxidation process was carried out by thermal gravimetric analysis (TGA). At 600-1150 degrees C, 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 degrees C, 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 degrees C, 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 degrees C while increasing Si content of the alloy resulted in higher oxidation rate above 1150 degrees C owing to the liquid fayalite formation.