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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 study the decarburization rule of 1.5 mm-thick Fe-C alloy ribbons in solid state, the test was conducted on the Fe-C alloy ribbons with initial carbon content of 3.2% and 1.5 mm thick. A certain proportion of Ar-H_2-H_2O mixed gas to create a weak oxidizing atmosphere, under the premise of ensuring that the iron matrix is not oxidized, respectively, the sample was heated to 1 293,1 353,1 413 K thermal decarbonization 10 ~ 50 min, the strip was decarburized in the form of a gas-solid reaction. The results show that the decarbonization reaction is approximately a first order reaction with an activation energy of 111.9 kJ / mol. The decarburization temperature has a significant effect on the decarburization effect. The final carbon content of 1.5 mm thick strip is fitted with the time The change is calculated as w_t = 3.2e ~ (0.196 12-1.62 × 10 -4 T) t).