Thermodynamic study on effect of TiO<sub>2</sub> addition on Al and Ti distribution during electroslag remelting of Incoloy825

Ju Jiantao; Wang Huayong; Zhu Zhihong; Yang Kangshuai; Gu Yue

doi:10.7513/j.issn.1004-7638.2022.03.024

Volume 43 Issue 3

Jun. 2022

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Ju Jiantao, Wang Huayong, Zhu Zhihong, Yang Kangshuai, Gu Yue. Thermodynamic study on effect of TiO2 addition on Al and Ti distribution during electroslag remelting of Incoloy825[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(3): 152-160. doi: 10.7513/j.issn.1004-7638.2022.03.024

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Ju Jiantao, Wang Huayong, Zhu Zhihong, Yang Kangshuai, Gu Yue. Thermodynamic study on effect of TiO₂ addition on Al and Ti distribution during electroslag remelting of Incoloy825[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(3): 152-160. doi: 10.7513/j.issn.1004-7638.2022.03.024

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Thermodynamic study on effect of TiO₂ addition on Al and Ti distribution during electroslag remelting of Incoloy825

doi: 10.7513/j.issn.1004-7638.2022.03.024

School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, Shannxi, China

Received Date: 2022-01-17
Publish Date: 2022-06-30

Abstract

Abstract

To investigate the variation of elements in ingots produced by electroslag remelting in low-fluorine slag system, based on Incoloy825 different contents of TiO₂ and deoxidizer were added into slag to carry out four sets of electroslag remelting experiments. A thermodynamic model was established based on the Ions and Molecule coexistence Theory (IMCT), thermodynamics theory and the mass conservation law to control Al and Ti contents. It is found out that increasing TiO₂ addition into the slag brings increasing Ti content and declined Al content in ingots, which is attributed to exchange reaction of 4Al+3TiO₂=3Ti+2Al₂O₃, but slight changes of Si and Mn contents. When the TiO₂ content remains constant, the Al and Ti contents increase along the height of ingots, while Si and Mn contents decrease. When the $ \mathrm{l}\mathrm{g}({a}_{{\mathrm{A}\mathrm{l}}_{2}{\mathrm{O}}_{3}}^{2}/{a}_{\mathrm{T}\mathrm{i}{\mathrm{O}}_{2}}^{2}) $ in slag is at −3.16 in combination with addition of Al deoxidizer, the obtained product can achieve uniform Al and Ti distribution. The predicted model shows good agreement with experimental results.
- Incoloy825,
- electroslag remelting,
- TiO₂,
- thermodynamic model

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References(20)

References

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