Identification of Titanium Oxide Phases Equilibrated with Liquid Fe–Ti Alloy Based on EBSD Analysis
Identification of Titanium Oxide Phases Equilibrated with Liquid Fe–Ti Alloy Based on EBSD Analysis
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DOI：
10.2355/isijinternational.46.987
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发表时间：
2006-07
影响因子：
1.8
通讯作者：
Woo-Yeol Cha;Takahiro Miki;Y. Sasaki;M. Hino
中科院分区：
文献类型：
--
作者：
Woo-Yeol Cha;Takahiro Miki;Y. Sasaki;M. Hino
文献中的钛脱氧平衡常数及其相互作用参数包括日本科学促进会（JSPS）推荐值都存在大量的不确定性。以往研究中存在不确定性的主要原因是对与液态Fe-Ti合金相平衡的钛氧化物相的信息不足。本文测定了不同钛含量的钛氧化物在铁钛合金熔体中的平衡相变。在1873 K下用“Ti 3 O 5”坩埚对不同Ti含量的Fe-Ti合金熔体进行了平衡。用电子背散射衍射（EBSD）谱图分析技术确定了“Ti_3O_5”坩埚与Fe-Ti合金熔体接触界面上的钛氧化物为平衡钛氧化物。当"Ti_3O_5“坩埚与Fe-Ti合金熔体充分反应并淬火后，本文对Fe-Ti合金中钛含量与钛氧化物平衡稳定区的计算结果与基于钛氧化物生成自由能和Ti在Fe-Ti合金中的活度的热力学计算结果相吻合。
There are huge quantities of uncertainties on the Ti deoxdiation equilibrium constants and their interaction parameters in the literatures including the recommended values by the Japan Society for the Promotion of Science (JSPS). The main reason of such uncertainties among the previous works is due to the insufficient information of titanium oxide phase in equilibrium with liquid Fe–Ti alloy. The measurement of the equilibrium phase changes of titanium oxides with various Ti contents in molten Fe–Ti alloy has been carried out in the present study. Molten Fe–Ti alloys with various Ti contents have been equilibrated with ‘Ti3O5’ crucibles at 1 873 K. The kinds of Ti oxide at the interface of ‘Ti3O5’ crucible contacted with molten Fe–Ti alloys have been identified as the equilibrium titanium oxides with the electron backscatter diffraction (EBSD) pattern analysis technique. After the ‘Ti3O5’ crucible reacted with molten Fe–Ti alloys adequately and both of them were quenched.The present result on the stable region of equilibrium titanium oxides with Ti contents in Fe–Ti alloy was in good agreement with the thermodynamically calculated results based on the free energies of titanium oxides formation and the activity of Ti in Fe–Ti alloy.