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Formation Mechanism of Inclusions in Steel by Ti-Al Deoxidation and Their Physicochemical Properties

Ti-Al脱氧钢中夹杂物的形成机理及其理化性能

基本信息

批准号：
13650800
负责人：
MORITA Kazuki
金额：
$ 2.05万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650800/
关键词：
Thermodynamics Inclusion in Steel Deoxidation Aluminum Titanium Phase Equilibrium Activity Knudsen Cell 鋼中介在物

项目摘要

Thermodynamic properties of the Al_2O_3-SiO_2-TiOx oxide system, which are important for the morphology control of steel using non-metallic inclusions formed during steelmaking processes, have been investigated.Firstly, phase relations for the Al_2O_3-SiO_2-TiOx system at 1873 K were clarified. Solubilities of Al_2O_3 and TiOx were found to be 28 mass% and 50 mass%, respectively, and the ratio of Ti^<4+>/ Ti^<3+> increased with increase in SiO_2 content of the oxide, which indicated that both Ti^<4+> and Ti^<3+> behaved as network formers also from the results of Raman spectroscopy of the quenched samples.Secondly, the activity of each constituent was measured. Oxide melts were equilibrated with Fe-C-Si alloys and the activity of SiO_2 was determined from the final Si content and activity coefficient of Si in the alloy. On the other hand, Knudsen cell effusion method was employed for the activity of Al_2O_3 From the vapor pressures of Al, Si, AlO and SiO for the molten oxide equilibrated with Al-Si-Ti alloy, the activities of Al_2O_3 and SiO_2 were determined. The obtained value of SiOs agreed well with that by chemical equilibration technique, and that of TiOx was also derived by Toop's method. These values demonstrated that the affinity of Si0_2 for Al_2O_3 was almost the same as that of TiOx.The findings drawn in the present research quantitatively provide the driving force necessary in discussing the mechanism of inclusion formation. Also, the composition of steel equilibrated with various compositions of oxide inclusions can be assessed from the results, which leads to an optimization in deoxidation process control.

本文研究了Al_2O_3-SiO_2-TiOx氧化体系的热力学性质，该体系对利用炼钢过程中形成的非金属夹杂物控制钢的形貌具有重要意义。首先，澄清了1873 K下Al_2O_3-SiO_2-TiOx体系的相关系。Al_2O_3和TiOx的溶解度分别为28质量%和50质量%，Ti^<4+>/ Ti^<3+>的比值随氧化物SiO_2含量的增加而增加，这表明Ti^<4+>和Ti^<3+>都具有成网的性质。其次，测量各成分的活性。用Fe-C-Si合金平衡氧化物熔体，并根据合金中最终Si含量和Si活度系数来确定SiO_2的活度。另一方面，采用Knudsen电解槽积液法测定Al_2O_3的活度。通过测定Al-Si- ti合金平衡的氧化液中Al、Si、AlO和SiO的蒸气压，测定了Al_2O_3和SiO_2的活度。SiOs的计算结果与化学平衡法的计算结果吻合较好，TiOx的计算结果也用Toop法得到。这些数值表明，Si0_2对Al_2O_3的亲和力与TiOx几乎相同。本研究的结果为探讨包裹体形成机制提供了定量的推动力。此外，还可以根据结果评估不同氧化物夹杂物平衡钢的成分，从而优化脱氧过程的控制。