摘要:
试验以初始碳含量为4.25%,厚度为1 mm铁碳合金薄带为研究对象,利用Ar-H2O-H2弱氧化性气氛在高温条件下,开展气—固反应脱碳研究。通过正交试验和单因素方法研究了水浴温度、初始H2含量、气体流量对1mm铁碳合金薄带脱碳的影响。试验结果表明:在脱碳温度一定的条件下,气氛条件相关的气体流量、初始H2含量、水浴温度对脱碳效果影响的显著性递减。本试验条件下,在200500 mL·min-1范围内增大气体流量,能显著改善脱碳效果;当水浴温度超过333 K时,铁碳合金薄带表面铁元素开始发生氧化,表面形成致密的铁氧化层导致脱碳速率显著下降。在1 413 K脱碳温度下,固态脱碳适宜的气氛条件为:气体流量500 mL·min-1,初始H2含量为15%,水浴温度333 K。
Abstract:
The study of gas-solid reactions is performed in order to investigate the impact of weak oxidizing atmosphere Ar-H2O-H2 on the 1 mm thick 4. 25% C iron-carbon alloy sheet. A serious of orthogonal experiments have been performed to investigate the influence of bath temperature,initial H2 content and gas flow on the decarburization of iron-carbon alloy ribbon.It is found out that the significance of gas flow,initial H2 content and bath temperature on decarburization sequentially decrease.When gas flow rate is in range of 200 ~500 mL·min-1,increasing flow rate can significantly improve the decarburization result.When water bath temperature exceeds 333 K,oxidation of iron takes place,and dense layer of Fe O appears when water bath temperature exceeds 343 K.Suitable parameters for the decarburization at 1 413 K are flowrate 500 mL·min-1,15% H2,bath temperature 333 K.
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