Transient Behavior of Inclusion Chemistry, Shape, and Structure in Fe-Al-Ti-O Melts: Effect of Titanium Source and Laboratory Deoxidation Simulation
Transient Behavior of Inclusion Chemistry, Shape, and Structure in Fe-Al-Ti-O Melts: Effect of Titanium Source and Laboratory Deoxidation Simulation
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DOI：
10.1007/s11663-009-9267-6
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发表时间：
2009-07
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影响因子：
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通讯作者：
Congmin Wang;N. T. Nuhfer;S. Sridhar
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文献类型：
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作者：
Congmin Wang;N. T. Nuhfer;S. Sridhar
在本研究中，在真空感应炉（VIF）中进行了实验室规模的脱氧实验，以阐明钛添加后瞬态阶段夹杂物的演变。采用三种不同的钛源（Fe-70 wt - pct Ti， Fe-30 wt - pct Ti和钛颗粒），并从包裹体化学、结构和形貌方面对结果进行了比较。研究发现，在铝熔体中加入钛后，立即形成含钛夹杂物，这些夹杂物是含有一定量钛的单相或双相颗粒，与熔体平衡预测相反。透射电镜（TEM）分析表明，这些夹杂物可能是Al2TiO5。夹杂物化学性质的变化伴随着夹杂物形态从球形到不规则的转变。随着时间的推移，包裹体的化学性质向热力学稳定的Al2O3方向转变，但形貌的变化仍然存在。临时al2tio5夹杂物的形成是在钛加入后和附近的局部高钛含量的结果。对比不同钛源在瞬态阶段产生的含钛包裹体的数量，发现它们可以排序为Ti > fe - 70% Ti > fe - 30% Ti。
In the present study, laboratory-scale deoxidation experiments in a vacuum-induction furnace (VIF) were carried out to elucidate the evolution of inclusions during transient stages after a titanium addition. Three different titanium sources (Fe-70 wt pct Ti, Fe-30 wt pct Ti, and titanium granules) were employed and the results were compared in terms of the inclusion chemistry, structure, and morphology. It was found that, immediately after titanium additions to an aluminum-killed melt, titanium-containing inclusions, which are either single-phase or dual-phase particles having a certain amount of titanium and are contrary to melt equilibrium predictions, were formed. Analysis by transmission electron microscope (TEM) suggested that these inclusions could be Al2TiO5. The change in the inclusion chemistry was accompanied by a shift in the inclusion morphology from spherical to irregular. With time, the inclusion chemistry shifted back toward the thermodynamically stable Al2O3, but the change in morphology remained. The temporary Al2TiO5inclusions were formed as a result of local high content of titanium immediately after and at the vicinity of the titanium addition. When comparing the different titanium sources, it was found that they can be ranked as Ti > Fe-70 pct Ti > Fe-30 pct Ti, in terms of the amount of titanium-containing inclusions produced during the transient stage.