为了研究1 mm铁碳合金薄带气-固反应脱碳动力学以及探索不同温度对薄带脱碳效果的影响.以初始碳质量分数为4.2%、厚度为1 mm的铁碳合金薄带为研究对象,在气体流量为400 mL/min、pH2O/pH2为0.85的Ar-H2-H2O混合气氛条件下,以高温气-固反应形式开展脱碳试验研究.结果表明,提高脱碳温度可以明显提高脱碳效果,在1413 K温度条件下脱碳30 min可以将碳脱至0.12%.宏观脱碳反应近似为表观一级反应,脱碳反应表观活化能为157.9 kJ/mol.脱碳反应初期主要受控于表面化学反应,后期碳在薄带内部的扩散成为主要限制性环节.
Focus on the study of decarburization behavior of 1 mm iron-carbon alloy ribbons with carbon mass content of 4.2%,a series of gas-solid reaction experiments at different temperatures were carried out. The impact of different temperatures on the decarburization of Fe-C ribbons and the dynamics of decarburizing process were investigated with the atmosphere of Ar-H2-H2O mixed gas,the gas flow rate was set as 400 mL/min,and the ratio of PH2O/PH2 was 0.85. The results showed that rising decarburizing temperature can improve the decarburization rate effectively. For example, the carbon content decreased to 0.12%after 30 min decarburization at 1413 K. Apparent decarburizing process can be concluded as nearly first-order reaction. Apparent activation energy of the decarburizing process calculated is 157.9 kJ/mol. The surface gas-solid chemical reaction is the controlling step in initial decarburizing stage and then,the diffusion of car-bon in ribbon bulk is the main controlling step in the following process.
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