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首页> 外文期刊>ISIJ international >Factors to Determine Inclusion Compositions in Molten Steel during the Secondary Refining Process of Case-Hardening Steel
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Factors to Determine Inclusion Compositions in Molten Steel during the Secondary Refining Process of Case-Hardening Steel

机译：确定表皮强化钢二次精炼过程中钢水中夹杂物成分的因素

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摘要

A study was carried out to observe inclusions during the secondary refining process of case-hardening steel to understand the factors to determine inclusion compositions. During the LF refining, inclusions changed from the primary deoxidation product of Al_2O_3 to MgO·Al_2O_3 and the CaO-Al_2O_3 system. At the end of LF refining, the compositions were placed on the tie-line connecting the areas of MgO·Al_2O_3 and CaO-Al_2O_3-MgO_(liq) in the CaO-Al_2O_3-MgO diagram. This change took place by the composition evolution targeting the thermodynamic equilibrium states. After the RH treatment, the inclusion compositions changed mainly to Al_2O_3 and the CaO-Al_2O_3 system because MgO·Al_2O_3 inclusions were removed, while the CaO-Al_2O_3 system inclusions, the most stable oxide, were remained. This behavior could be described by the interfacial properties between the oxides and the molten steel. Al_2O_3 inclusions were considered to be newly generated during the RH treatment. It was confirmed that three factors of (1) equilibrium state (2) removal and (3) generation of inclusions dominated to determine the inclusion compositions.
机译：进行了一项研究，以便在表面硬化钢的二次精炼过程中观察夹杂物，以了解确定夹杂物成分的因素。在LF精炼过程中，夹杂物从Al_2O_3的一次脱氧产物变为MgO·Al_2O_3和CaO-Al_2O_3体系。在LF精炼结束时，将组合物放在连接CaO-Al_2O_3-MgO图中的MgO·Al_2O_3和CaO-Al_2O_3-MgO_（liq）的区域的连接线上。这种变化是通过以热力学平衡状态为目标的成分演变而发生的。 RH处理后，由于去除了MgO·Al_2O_3夹杂物而保留了最稳定的氧化物CaO-Al_2O_3系夹杂物，因此夹杂物组成主要变为Al_2O_3和CaO-Al_2O_3系。这种行为可以用氧化物和钢水之间的界面性质来描述。 Al_2O_3夹杂物被认为是在RH处理期间新产生的。证实了确定（1）平衡状态，（2）去除和（3）夹杂物的三个因素占主导地位。

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