Reactiveness of Low Fluorine Slag for Electroslag Remelting to Al and Ti of Incoloy 825 Alloy

doi:10.12442/j.issn.1002-185X.20190539

Home > Archive>Volume 49, Issue 1, 2020 >233-240. DOI:10.12442/j.issn.1002-185X.20190539

Reactiveness of Low Fluorine Slag for Electroslag Remelting to Al and Ti of Incoloy 825 Alloy
DOI:
                        10.12442/j.issn.1002-185X.20190539
                    
Author:
                        Ju Jiantao1Ju Jiantao
School of Metallurgical Engineering,Xian University of Architecture and Technology,Xi′an
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An Jialiang1An Jialiang
School of Metallurgical Engineering,Xian University of Architecture and Technology,Xi′an
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Shi Chengbin2Shi Chengbin
State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing
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Zheng Dingli2Zheng Dingli
State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing
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Ji Guangheng1Ji Guangheng
School of Metallurgical Engineering,Xian University of Architecture and Technology,Xi′an
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Affiliation:1.School of Metallurgical Engineering,Xian University of Architecture and Technology,Xi′an;2.State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing
Clc Number:TF141
Fund Project:The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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Abstract:

The effect of the content of TiO2 in CaF2-CaO-Al2O3-MgO-Li2O-(TiO2) slag on the content of Al and Ti in Incoloy 825 alloy was discussed by the high temperature slag-metal equilibrium experiment. The relationship between the activity of TiO2 and Al2O3 in slag and the compositions of slag was analyzed by FactSage 7.3 thermodynamic software. The influence rule of components in slag on Gibbs free energy of reaction 4[Al]+3(TiO2) = 3[Ti]+2(Al2O3) and the content of equilibrium Al and Ti in alloy were studied. The results show that the Gibbs free energy of the reaction is negatively correlated with TiO2, CaF2 and MgO in the slag, and positively correlated with CaO and Al2O3. When the content of TiO2 in slag is 0-7.27%, the effect of burning Ti to increase Al is gradually reduced. When the content of TiO2 is 11.27%, the effect of burning Al to increase Ti is appeared. At the same temperature, with the increase of CaO and Al2O3 content in slag, the equilibrium Ti content in alloy decreases and the equilibrium Al content increases. With the increase of TiO2 content in slag, the equilibrium Ti content in alloy increases and the equilibrium Al content decreases. The change of CaF2 and MgO content in slag has little effect on the equilibrium Al and Ti content in the alloy. The experimental results are in good agreement with the thermodynamic calculation results.

Key words:Electroslag remelting; Low-fluoride slag; Incoloy825 alloy; FactSage; Activity

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[Ju Jiantao, An Jialiang, Shi Chengbin, Zheng Dingli, Ji Guangheng. Reactiveness of Low Fluorine Slag for Electroslag Remelting to Al and Ti of Incoloy 825 Alloy[J]. Rare Metal Materials and Engineering,2020,49(1):233~240.]
DOI：10.12442/j. issn.1002-185X.20190539

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Received:June 26,2019
Revised:September 16,2019
Adopted:September 17,2019
Online: February 16,2020
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