气氛条件对铁碳合金薄带气—固反应脱碳的影响
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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-H_2O-H_2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H_2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H_2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200~500 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H_2含量为15%,水浴温度333 K。
The study of gas-solid reactions is performed in order to investigate the impact of weak oxidizing atmosphere Ar-H_2O-H_2 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 H_2 content and gas flow on the decarburization of iron-carbon alloy ribbon.It is found out that the significance of gas flow,initial H_2 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% H_2,bath temperature 333 K.
The study of gas-solid reactions is performed in order to investigate the impact of weak oxidizing atmosphere Ar-H_2O-H_2 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 H_2 content and gas flow on the decarburization of iron-carbon alloy ribbon.It is found out that the significance of gas flow,initial H_2 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% H_2,bath temperature 333 K.
引文
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[8]Cheng Rong,Ai Liqun,Hong Lukuo,et al.Experiment of solid state decarburization process of 2 mm Fe-C alloy sheet[J].Iron and Steel,2016,51(7):28-33.(程荣,艾立群,洪陆阔,等.2 mm铁碳合金薄带固态脱碳试验[J].钢铁,2016,51(7):28-33.)
[9]Cheng Rong,Ai Liqun,Hong Lukuo,et al.Decarburization dynamic analysis of gas-solid reaction of Fe-C alloy ribbon[J].China Metallurgy,2016,26(4):27-31.(程荣,艾立群,洪陆阔,等.铁碳合金薄带气—固反应脱碳动力学分析[J].中国冶金,2016,26(4):27-31.)
[10]Lee W H,Park J O,Lee J S,et al.Solid state steelmaking by decarburisation of rapidly solidified high carbon iron sheet[J].Ironmaking&Steelmaking,2012,39(7):530-534.
[11]Mcdonald C.Solid state steelmaking:process technical and economic viability[J].Ironmaking&Steelmaking,2012,39(7):487-489.
[12]Boenen B,Jacobs S,De Wulf M.Modelling decarburization in electrical steels[J].Steel Research International,2005,76(6):425-428.
[13]Luo Haiwen,Xiang Rui,Chen Linfeng.Modeling the decarburization kinetics in grain-oriented silicon steels[J].Chinese Science Bulletin,2014,59(10):866-871.(罗海文,向睿,陈凌峰,等.取向硅钢中脱碳工艺的数值模拟[J].科学通报,2014,59(10):866-871.)