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首页> 外文期刊>Journal of Materials Engineering and Performance >Experimental Investigation of the System Nonmetallic Inclusion-Molten Steel-Refractory System at High Temperatures
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Experimental Investigation of the System Nonmetallic Inclusion-Molten Steel-Refractory System at High Temperatures

机译：高温系统非金属包装钢 - 耐火系统的实验研究

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In continuous casting, the buildup of particles in the flow control system is called clogging. Clogging may be caused by preexisting nonmetallic inclusions attached to the refractory wall, interrupting or disturbing the fluid flow conditions. The interfacial properties of the nonmetallic inclusion-molten steel-refractory system are believed to play a key role in the clogging tendency of selected steel grades in contact with ceramics. The combination of a high-temperature laser scanning confocal microscope (HT-LSCM), which is employed for in situ observation of inclusions’ behavior in the liquid steel or at the steel/ceramic interface, and a high-temperature drop shape analyzer (HT-DSA), which is utilized for contact angle measurements, enabled the investigation of reactions and interactions in the described system at experimental temperatures of approximately 1600?°C. The objective of this study was to develop a method to obtain qualitative information on the deposition of nonmetallic inclusions (NMIs) in the submerged entry nozzle (SEN) during casting. The behavior of solid NMIs from a calcium-treated steel at the interface between liquid steel and Al~(2)O~(3)or MgO was investigated by means of HT-LSCM. During the test evaluation, inclusions were found to separate at the steel/ceramic interface due to an attractive force. This force increased with the NMIs’ size as well as with the ceramic particle change. The HT-DSA provided contact angle data between molten steel and the ceramic used for implementation into the theoretical capillary force model. A clear correspondence between the estimated and calculated capillary forces was observed. The change in the wettability of the system, as induced by the change in the ceramic from MgO to Al~(2)O~(3), showed a reduction of the attractive forces, indicating a weaker separation toward the SEN for the same inclusion type. This study confirmed the strong potential of wettability investigations to predict the clogging tendency of certain steel grades.
机译：在连续铸造中，流量控制系统中的粒子的堆积称为堵塞。通过将连接到耐火壁的非金属夹杂物预先存在，可能引起堵塞，中断或扰乱流体流动条件。认为非金属夹杂物钢 - 耐火系统的界面性能在与陶瓷接触的选定钢等级的堵塞趋势中起关键作用。高温激光扫描共聚焦显微镜（HT-LSCM）的组合，其用于原位观察液体钢中的夹杂物行为或钢/陶瓷界面，以及高温下降形状分析仪（HT用于接触角测量的-DSA）使得在大约1600℃的实验温度下对所描述的系统中的反应和相互作用的研究能够进行调查。本研究的目的是开发一种方法，以获得有关铸造期间浸没式入口喷嘴（SEN）中的非金属夹杂物（NMIS）沉积的定性信息。通过HT-LSCM研究了在液体钢和Al〜（2）O〜（3）O〜（3）O〜（3）或MgO之间的界面处的钙处理钢的固体NMI的行为。在测试评估期间，发现夹杂物由于有吸引力而导致的钢/陶瓷界面分离。这种力随NMIS的尺寸和陶瓷颗粒变化而增加。 HT-DSA提供了钢水和用于实施理论毛细力模型的陶瓷之间的接触角数据。观察到估计和计算的毛细力之间的清晰对应。由MgO到Al〜（2）O〜（3）的陶瓷的变化引起的系统润湿性的变化表明有吸引力的力量减少，表明对同样的夹杂物的分离较弱类型。本研究证实了润湿性调查的强大潜力，以预测某些钢等级的堵塞趋势。

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