1.5 mm铁碳合金薄带气-固反应脱碳研究

Experimental study of Gas-solid Decarburization process of 1.5 mm Fe-C Alloy Ribbon

为了研究1.5 mm厚的铁碳合金薄带固态下的脱碳规律,试验以初始碳质量分数为3.2%,1.5 mm厚的铁碳合金薄带作为研究对象,通过在真空气氛脱碳炉内通入一定比例的Ar-H_2-H_2O混合气体营造出弱氧化性气氛,在保证铁基体不发生氧化的前提下,分别将试样加热到1 293、1 353、1 413 K保温脱碳10~50 min,以气-固反应的形式对薄带进行脱碳处理。试验结果表明:脱碳反应近似为一级反应,反应活化能为111.9 k J/mol;脱碳温度的高低对脱碳效果影响显著,拟合得出1.5 mm厚的薄带最终碳含量随时间变化的计算式为w_t=3.2e^((0.196 12-1.62×10^(-4)T)t)。

In order to investigate the decarburizafion law of 1.5 mm thick iron-carbon alloy strip, an iron carbon steel strip with initial carbon mass fraction of 3.2% was used and placed into a decarburization furnace under weak oxidizing atmosphere created by Ar-H2-H2O mixed gas and heated. The samples were heated to 1 293 K,1 353 K and 1 413 K with holding time of 10 -50 minutes respectively for the decar-burization treatment via gas-solid reaction, the sample . The results show that the decarburization reaction is a approximate first-order reaction, and the activation energy is 111.9 kJ / mol. The decarburization temperature has a significant effect on the decarburization effect. The final carbon content as function ofholding time can be expressed as wt=3.2e（（0.196 12-1.62×10^-4T）t）.