薄带厚度对Fe-C合金气-固脱碳反应的影响  

Influence of thickness on gas-solid decarburization reaction of Fe-C alloy sheet

作　　者：程荣 艾立群 李亚强 洪璐阔 李强 

机构地区：[1]华北理工大学冶金与能源学院,河北唐山063009 [2]钢铁研究总院先进钢铁流程及材料国家重点实验室,北京100081

出　　处：《钢铁研究学报》2017年第7期556-561,共6页Journal of Iron and Steel Research

基　　金：国家自然科学基金资助项目(51374090)

摘　　要：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%。To investigate influence of thickness on the gas-solid decarburization reaction of Fe-C alloy sheet,which the initial carbon content of Fe-C sheets were 4.20 mass% with different thicknesses of 0.6,1,1.5and 2mm,decarburization reaction of Fe-C alloy sheet in weak oxidizing atmosphere（Ar-H2-H2O）was studied.The results show that the decarburization rates of Fe-C alloy sheets with different thicknesses decrease with increasing the reaction time.The thinner the thickness of sheet is,the faster the decarburization rate gets.The diffusion of carbon from the interior of sheet to the reaction interface is the controlling step of decarburization rate.The empirical formula of decarburization time,strip thickness and decarburization is obtained by fitting the experimental data.The gas-solid decarburization of Fe-C alloy sheets with different thickness are all nearly first-order reactions by mathematically described decarburization law.A segmented heating method was proposed to improve the decarburization effect.By the new method,the carbon content of Fe-C alloy sheet with thickness of 1.5mm decreases from 4.20mass%to 0.39mass% after 50 min treating.

关 键 词：脱碳 厚度 限制性环节 分段加热法 

分 类 号：TG141[一般工业技术—材料科学与工程]