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为了研究薄带厚度对Fe-C合金薄带气-固脱碳反应的影响,实验采用初始碳质量分数为4.20%,厚度分别为0.6、1.0、1.5和2.0mm的Fe-C合金薄带作为原料,在Ar-H2-H2O弱氧化气氛条件下进行气-固脱碳反应。结果表明,不同厚度薄带的脱碳速率均随着脱碳时间的延长而降低,薄带越薄脱碳速率越快,碳在薄带内部向反应界面的扩散是整个脱碳反应的限制性环节;通过对实验数据的拟合得到脱碳时间、薄带厚度和脱碳量三者的经验公式,同时对脱碳规律进行了数学的描述,得出不同厚度薄带的脱碳反应均近似于一级反应。提出了可明显改善脱碳效果的分段加热脱碳法,采用该种方法,厚度为1.5mm的薄带在50min内其碳的质量分数可由初始的4.20%脱除到0.39%。
In order to study the influence of strip thickness on the gas-solid decarburization reaction of Fe-C alloy strip, Fe-C alloy strip with initial carbon content of 4.20%, thickness of 0.6, 1.0, 1.5 and 2.0 mm Raw materials, gas-solid decarburization reaction under Ar-H2-H2O weak oxidizing atmosphere. The results show that the decarburization rate decreases with the decarburization time and the decarburization rate decreases with the increase of decarburization time. The diffusion of carbon into the reaction interface is the limiting part of the decarburization reaction The empirical formula of the decarburization time, the strip thickness and the decarburization were obtained by fitting the experimental data. At the same time, the decarburization law was described mathematically. It was found that the decarburization reactions of the strip with different thickness were similar First-order reaction. In this method, the mass fraction of carbon in strip with a thickness of 1.5mm can be removed from the initial 4.20% to 0.39% in 50min.