首页> 外文期刊>ISIJ international >A Reaction between High Mn–High Al Steel and CaO–SiO2-Type Molten Mold Flux: Reaction Mechanism Change by High Al Content ([pct Al]0 = 5.2) in the Steel and Accumulation of Reaction Product at the Reaction Interface
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A Reaction between High Mn–High Al Steel and CaO–SiO2-Type Molten Mold Flux: Reaction Mechanism Change by High Al Content ([pct Al]0 = 5.2) in the Steel and Accumulation of Reaction Product at the Reaction Interface

机译:高锰高铝钢与CaO-SiO 2 型熔模熔剂的反应:高Al含量引起的反应机理变化([pct Al] 0 = 5.2)在钢中和反应界面上反应产物的积累

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A series of laboratory-scale experiments were carried out in order to elucidate the reaction mechanism between high Mn-high Al steel and CaO–SiO_(2)-type molten mold flux at 1450°C, which represents the reaction taking place during continuous casting of the steel. Compared to the previous study [Kim et al. , Metall. Mater. Trans. 44B (2013) 299–308], high Al content in the liquid steel ([pct Al]_(0) = 5.2) and high MgO content in the liquid flux ((pct MgO)_(0) = 5 to 15) were employed, in order to confirm change of rate-controlling step from mass transport of Al in liquid steel to more complicated steps including mass transport in liquid flux. It was found that Al_(2)O_(3) was rapidly accumulated near the interface of the flux, and SiO_(2) and Na_(2)O were reduced simultaneously, regardless of (pct MgO)_(0). At the early stage of the reaction (1 min), MgAl_(2)O_(4) particles were observed in the flux near the interface, then the particles were spreading out into the bulk flux as the reaction time passed. Other solid phases (CaAl_(4)O_(7), Al_(2)O_(3)) were also observed due to local depletion of MgO in the flux. The MgAl_(2)O_(4) formation mechanism and its effect on mass transfer in the molten flux were discussed. A series of simple kinetic analyses showed that the mass transport of Al in liquid steel is no more controlling the reaction rate. It was concluded that there were possibilities of mass transport in the flux phase contributing reaction rate controlling step.
机译:为了阐明高锰高铝钢与CaO–SiO_(2)型熔融保护渣在1450°C之间的反应机理,进行了一系列实验室规模的实验,该反应机理代表了连续铸造过程中发生的反应。钢。与先前的研究相比[Kim等。 ,Metall。母校反式44B(2013)299–308],钢液中的铝含量高([pct Al] _(0)= 5.2),液流中的MgO含量高((pct MgO)_(0)= 5至15)为了确定速率控制步骤从液态钢中Al的质量传输到更复杂的步骤(包括液态通量的质量传输)的过程,我们采用了这种方法。发现Al_(2)O_(3)在焊剂界面附近迅速聚集,而SiO_(2)和Na_(2)O同时还原,而与(pct MgO)_(0)无关。在反应的早期阶段(1分钟),在界面附近的助熔剂中观察到MgAl_(2)O_(4)颗粒,然后随着反应时间的流逝,这些颗粒散布到主体助熔剂中。由于焊剂中MgO的局部耗尽,还观察到其他固相(CaAl_(4)O_(7),Al_(2)O_(3))。讨论了MgAl_(2)O_(4)的形成机理及其对熔剂中传质的影响。一系列简单的动力学分析表明,铝在钢液中的传质不再控制反应速率。结论是,在助熔剂相中质量传输有助于反应速率控制步骤。

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