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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、p_(H_2O)/p_(H_2)为0.85的Ar-H_2-H_2O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1 413 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 k J/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。
In order to study the decarburization kinetics of 1 mm Fe-C strip gas-solid reaction and to explore the effect of different temperature on the decarburization effect of the strip. The results show that the Ar-H_2-H_2O mixed with Fe (superscript 2 +) with a flow rate of 400 mL / min and a p_ (H_2O) / p_ (H_2) Under the atmospheric conditions, the decarburization test was carried out in the form of high temperature gas-solid reaction. The results show that increasing the decarburization temperature can obviously improve the decarburization effect, and decarburization can reach 0.12% at a temperature of 1 413 K for 30 min. The macro-decarbonization reaction is approximately an apparent first-order reaction with an apparent activation energy of 157.9 kJ / mol. The initial decarburization reaction is mainly controlled by the surface chemical reaction, the latter part of the carbon diffusion within the thin band has become the main limiting link.