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采用LaCrO3高温管式炉重熔HP295钢,向钢液中加入不同量的Ce进行脱氧,用SEM及EDS对钢中含Ce夹杂物进行分析,并对Ce-Al-O-S系进行热力学计算。实验结果显示,含Ce夹杂物主要为不规则的Ce2O3和近球形的Ce2O2S,大部分夹杂物尺寸小于5μm。热力学计算表明,含Ce夹杂物的形成主要受钢液中[O],[S]及[Al]S含量的影响,本实验条件下主要形成Ce2O3和Ce2O2S夹杂物;当钢液中Ce与Al的活度比≥0.08时,Al2O3可转变为CeAlO3夹杂物。
The LaCrO3 high temperature tubular furnace was used to remelt HP295 steel. Different amounts of Ce were added into the molten steel to deoxidize. The Ce inclusions in the steel were analyzed by SEM and EDS. The Ce-Al-O-S series were calculated thermodynamically. The experimental results show that Ce inclusions are mainly irregular Ce2O3 and nearly spherical Ce2O2S, the size of most inclusions is less than 5μm. Thermodynamic calculations show that the formation of inclusions containing Ce is mainly affected by the contents of [O], [S] and [Al] S in the molten steel. Ce2O3 and Ce2O2S inclusions are mainly formed under the experimental conditions. When the activity ratio ≥0.08, Al2O3 can be transformed into CeAlO3 inclusions.