Kinetic Study on Alloying Element Transfer During an Electroslag Remelting Process
Kinetic Study on Alloying Element Transfer During an Electroslag Remelting Process
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电渣重熔过程合金元素迁移动力学研究
DOI：
10.1007/s11663-019-01690-1
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发表时间：
2019-12-01
影响因子：
3
通讯作者：
Wang, Hui-Hua
中科院分区：
文献类型：
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作者：
Hou, Dong;Wang, De-Yong;Wang, Hui-Hua
针对电渣重熔过程中渣对合金元素的影响进行了实验和理论研究，重点是建立一个传质模型来理解渣-金属反应机理。采用1Cr 21 Ni 5 Ti不锈钢作为电极，在50 kg电渣重熔炉上用两种不同的渣进行重熔。分析了沿着铸锭轴向的硫、铝、钛和硅的含量。在渗透理论和膜理论的基础上，本文建立的理论模型阐明了渣-金反应的动力学，揭示了电渣重熔过程中合金元素的转移机理。模型计算结果与实验结果吻合较好。该模型表明，（O2-）+ [S] =（S2-）+ [O]的脱硫反应生成的[O]导致钢中合金元素氧化为[M] + [O] =（MO）。在渣温上升的第一阶段，硫的分配比随渣温的升高而降低，由于硫的分配比大和良好的动力学条件的共同作用，在电渣重熔过程开始时锭中的硫浓度低于其余过程。在渣温上升的第一阶段，沿锭高方向铝的浓度沿着呈上升趋势，在渣温上升的第二阶段，沿锭高方向铝的浓度呈下降趋势。解决这一问题的方法有两种：一种是采用高温熔渣技术启动电渣重熔炉，另一种是在第一次渣温上升期继续向熔渣中添加过量的二氧化钛。
Experimental and theoretical studies have been carried out to investigate the effects of slag on the alloying elements in ingots during the electroslag remelting (ESR) process with a focus on developing a mass-transfer model to understand the mechanism of slag-metal reaction. Stainless steel 1Cr21Ni5Ti was used as the electrode and remelted with two different kinds of slags using a 50-kg ESR furnace. The contents of sulfur, aluminum, titanium and silicon along the axial direction of the produced ingots were analyzed. On the basis of the penetration and film theories, the theoretical model developed in this work elucidates the kinetics of the slag-metal reaction revealing the mechanism of alloying element transfer during the ESR process. The calculation results obtained from the model agree well with the experimental results. The model indicates that the resultant [O] coming from the desulfurization reaction of (O2−) + [S] = (S2−) + [O] causes the oxidation of alloying elements in steel by [M] + [O] = (MO). The distribution ratio of sulfurLSdecreases with the increase of slag temperature in the first slag-temperature-rising period, and the concentration of sulfur in the ingot at the beginning of the ESR process is lower than in the rest of the process because of the combination of the large distribution ratio of sulfurLSand excellent kinetic conditions. The concentration of aluminum along the height of the ingot has an increasing trend in the first slag-temperature-rising period, while it has a decreasing trend in the rest of the process. Two methods can solve this problem: one is starting up the ESR furnace by high temperature molten slag technology and the other is continually adding extra titania into the molten slag in the first slag-temperature-rising period.