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脱碳退火时间是决定Fe-3%Si钢表面内氧化行为的重要工艺参数之一,继而影响着后续渗氮及二次再结晶工艺。在1 103K的退火温度及N2+H2+H2O的退火气氛下进行了脱碳退火实验,研究了退火时间对Fe-3%Si钢表面氧化行为的影响。通过傅里叶变换红外光谱仪、扫描电镜及辉光放电质谱仪观察了Fe-3%Si钢表面氧化层的演变过程,分析了氧化层内硅、氧含量分布趋势,建立了氧化层结构与氧化物含量之间的关系。实验结果表明,经过脱碳退火后,Fe-3%Si钢表面氧化物由二氧化硅和铁橄榄石组成。随着退火时间的延长,内氧化层增厚,硅元素在内氧化层中的富集程度增加。当硅钢表面氧化深度相同时,氧化物含量随退火时间的增加而增多。
The decarburization annealing time is one of the important process parameters that determines the oxidation behavior in the surface of Fe-3% Si steel, which in turn affects the subsequent nitriding and secondary recrystallization processes. The decarburization annealing experiment was carried out at the annealing temperature of 1 103K and the annealing atmosphere of N2 + H2 + H2O. The effect of annealing time on the surface oxidation behavior of Fe-3% Si steel was studied. The evolution process of oxide layer on the surface of Fe-3% Si steel was observed by Fourier transform infrared spectroscopy, scanning electron microscopy and glow discharge mass spectrometry. The distribution of silicon and oxygen content in the oxide layer was analyzed. The structure and oxidation of oxide layer The relationship between content. The experimental results show that, after decarburization annealing, the surface oxide of Fe-3% Si steel is composed of silica and fayalite. With the extension of annealing time, the inner oxide layer thickens and the enrichment of silicon element in the inner oxide layer increases. When the depth of oxidation of silicon steel surface is the same, the oxide content increases with the increase of annealing time.