工程科学学报.第43卷.第6期：816-824.2021年6月 Chinese Journal of Engineering,Vol.43,No.6:816-824,June 2021 https://doi.org/10.13374/j.issn2095-9389.2020.04.17.003;http://cje.ustb.edu.cn H2/HO气氛下Fe-C合金薄带气固脱碳反应动力学 艾立群，侯耀斌，洪陆阔⑧，周美洁，孙彩娇，孟凡峻，周玉青 华北理工大学治金与能源学院，唐山063210 ☒通信作者，E-mail:honglk@ncst.edu..cn 摘要为对H/H0气氛下F©-C合金薄带的气固反应脱碳进行动力学研究，在保证快速脱碳而铁不氧化的前提下，利用可 控气氛高温管式脱碳炉，研究了不同的脱碳温度、薄带厚度、脱碳时间对F©-C合金薄带脱碳效果的影响.结果表明延长脱 碳时间、提高脱碳温度、减少薄带厚度均可提高脱碳效果.当脱碳温度为1353K,在脱碳过程中，薄带可以分成明显的3层， 由表面到内部依次是完全脱碳层、部分脱碳层和未脱碳层.完全脱碳层的组织为铁素体，此部分碳含量最低：部分脱碳层由 铁素体、渗碳体和少量石墨相组成，未脱碳层由珠光体和大量石墨相组成，此部分碳含量最高.脱碳层的厚度随着脱碳时间 的延长而增加，脱碳层的厚度y与时间1平方根满足良好的线性关系，可用函数y=k5描述，碳原子扩散所需扩散激活能为 122.36kJmo,脱碳反应为表观一级反应，表观活化能为153.79kmo广 关键词脱碳：动力学：气固反应：F©C合金：扩散 分类号TF746 Gas-solid reaction kinetics of decarburization of Fe-C alloy strips in H2/H2O Al Li-qun.HOU Yao-bin,HONG Lu-kuo,ZHOU Mei-jie,SUN Cai-jiao,MENG Fan-jun.ZHOU Yu-qing College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210,China Corresponding author,E-mail:honglk@ncst.edu.cn ABSTRACT To address environmental issues and decrease production costs,the disruptively innovative solidstate steelmaking pro- cess was investigated.In this process,a high-carbon sheet is continuously decarburized using an oxidizing gas to achieve a low- carbon sheet.A significant benefit of the process is the elimination of several conventional processes,including the basic oxygen process,secondary refinement processes,and continuous casting,and the absence of inclusions.The most important feature of the process is the use of high-carbon iron melts to avoid inclusion formation,so that secondary refinement processes are eliminated.To study the gas-solid reaction kinetics of the decarburization of Fe-C alloy strips in H/HO,the effects of the decarburization temperature, strip thickness,and decarburization time on the decarburization effect of the Fe-C alloy strips were studied by a controlled-atmosphere high-temperature tube decarburization furnace.The results show that prolonging the decarburization time,increasing the decarburization temperature,and reducing the strip thickness can improve the decarburization effect.The Fe-C alloy strip cross section is composed of the complete decarburization layer,partial decarburization layer,and nondecarburized layer at 1353 K.The microstructure of the complete decarburization layer is ferrite.The partial decarburization layer is composed of ferrite,cementite,and a small amount of graphite phase.The nondecarburized layer is composed of pearlite and a large amount of graphite phase.The thickness of the decarburized layer has a good linear relationship with the square root of the decarburization time,which can be described by the function yk.The diffusion activation energy of the decarburization reaction of the 1.5 mm Fe-Calloy strip is 122.36 kJmol The variations of the average carbon content were studied,and the apparent activation energy of the decarburization reaction of the Fe-C alloy strips 收稿日期：2020-04-17 基金项目：国家自然科学基金资助项目(51374090)：河北省自然科学基金资助项目(E2019209160.E2018209284):河北省教有厅科技基础 研究资助项目(JQN2019007);河北省研究生创新资助项目(CXZZBS2020131)H2 /H2O 气氛下 Fe‒C 合金薄带气固脱碳反应动力学 艾立群，侯耀斌，洪陆阔苣，周美洁，孙彩娇，孟凡峻，周玉青 华北理工大学冶金与能源学院，唐山 063210 苣通信作者，E-mail：honglk@ncst.edu.cn 摘    要    为对 H2 /H2O 气氛下 Fe‒C 合金薄带的气固反应脱碳进行动力学研究，在保证快速脱碳而铁不氧化的前提下，利用可 控气氛高温管式脱碳炉，研究了不同的脱碳温度、薄带厚度、脱碳时间对 Fe‒C 合金薄带脱碳效果的影响. 结果表明延长脱 碳时间、提高脱碳温度、减少薄带厚度均可提高脱碳效果. 当脱碳温度为 1353 K，在脱碳过程中，薄带可以分成明显的 3 层， 由表面到内部依次是完全脱碳层、部分脱碳层和未脱碳层. 完全脱碳层的组织为铁素体，此部分碳含量最低；部分脱碳层由 铁素体、渗碳体和少量石墨相组成，未脱碳层由珠光体和大量石墨相组成，此部分碳含量最高. 脱碳层的厚度随着脱碳时间 的延长而增加，脱碳层的厚度 y 与时间 t 平方根满足良好的线性关系，可用函数 y =kt0.5 描述，碳原子扩散所需扩散激活能为 122.36 kJ·mol−1，脱碳反应为表观一级反应，表观活化能为 153.79 kJ·mol−1 . 关键词    脱碳；动力学；气固反应；Fe–C 合金；扩散 分类号    TF746 Gas–solid reaction kinetics of decarburization of Fe–C alloy strips in H2 /H2O AI Li-qun，HOU Yao-bin，HONG Lu-kuo苣 ，ZHOU Mei-jie，SUN Cai-jiao，MENG Fan-jun，ZHOU Yu-qing College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, China 苣 Corresponding author, E-mail: honglk@ncst.edu.cn ABSTRACT    To address environmental issues and decrease production costs, the disruptively innovative solidstate steelmaking pro￾cess was investigated. In this process, a high-carbon sheet is continuously decarburized using an oxidizing gas to achieve a low￾carbon sheet. A significant benefit of the process is the elimination of several conventional processes, including the basic oxygen process, secondary refinement processes, and continuous casting, and the absence of inclusions. The most important feature of the process is the use of high-carbon iron melts to avoid inclusion formation, so that secondary refinement processes are eliminated. To study the gas–solid reaction kinetics of the decarburization of Fe–C alloy strips in H2 /H2O, the effects of the decarburization temperature, strip thickness, and decarburization time on the decarburization effect of the Fe–C alloy strips were studied by a controlled-atmosphere high-temperature tube decarburization furnace. The results show that prolonging the decarburization time, increasing the decarburization temperature, and reducing the strip thickness can improve the decarburization effect. The Fe–C alloy strip cross section is composed of the complete decarburization layer, partial decarburization layer, and nondecarburized layer at 1353 K. The microstructure of the complete decarburization layer is ferrite. The partial decarburization layer is composed of ferrite, cementite, and a small amount of graphite phase. The nondecarburized layer is composed of pearlite and a large amount of graphite phase. The thickness of the decarburized layer has a good linear relationship with the square root of the decarburization time, which can be described by the function y = kt0.5. The diffusion activation energy of the decarburization reaction of the 1.5 mm Fe–C alloy strip is 122.36 kJ·mol−1. The variations of the average carbon content were studied, and the apparent activation energy of the decarburization reaction of the Fe–C alloy strips 收稿日期: 2020−04−17 基金项目: 国家自然科学基金资助项目（51374090）；河北省自然科学基金资助项目（E2019209160，E2018209284）；河北省教育厅科技基础 研究资助项目（JQN2019007）；河北省研究生创新资助项目（CXZZBS2020131） 工程科学学报，第 43 卷，第 6 期：816−824，2021 年 6 月 Chinese Journal of Engineering, Vol. 43, No. 6: 816−824, June 2021 https://doi.org/10.13374/j.issn2095-9389.2020.04.17.003; http://cje.ustb.edu.cn