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電渣重熔用低氟渣與Incoloy825合金中Al、Ti反應(yīng)性的研究
作者:
作者單位:

1.西安建筑科技大學(xué)冶金工程學(xué)院;2.北京科技大學(xué)冶金新技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室

作者簡(jiǎn)介:

通訊作者:

中圖分類號(hào):

TF141

基金項(xiàng)目:

國(guó)家自然科學(xué)基金資助(項(xiàng)目號(hào)51774225)


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

Fund Project:

The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    摘要:

    通過(guò)高溫渣-金平衡實(shí)驗(yàn)，探討了電渣重熔用低氟渣CaF2-CaO-Al2O3-MgO-Li2O-(TiO2)中TiO2含量對(duì)Incoloy825合金中Al、Ti含量的影響。并利用FactSage7.3熱力學(xué)軟件分析了渣中TiO2和Al2O3的活度與渣成分的關(guān)系。研究了渣中組元對(duì)反應(yīng)4[Al]+3(TiO2)=3[Ti]+2(Al2O3)的吉布斯自由能和合金中平衡Al、Ti含量的影響規(guī)律。結(jié)果表明：反應(yīng)的吉布斯自由能與渣中TiO2、CaF2和MgO呈負(fù)相關(guān)，與CaO和Al2O3呈正相關(guān)；渣中TiO2含量為0～7.27%時(shí)，合金燒鈦增鋁現(xiàn)象逐漸減弱，TiO2含量為11.27%時(shí)，又出現(xiàn)燒鋁增鈦現(xiàn)象；同一溫度下，隨著渣中CaO和Al2O3含量增加，合金中平衡Ti含量降低，平衡Al含量升高。隨著渣中TiO2含量增加，合金中平衡Ti含量升高，平衡Al含量降低。渣中CaF2和MgO含量變化對(duì)合金中平衡Al、Ti含量影響較小。實(shí)驗(yàn)結(jié)果與熱力學(xué)計(jì)算結(jié)果能夠很好的吻合。

    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.

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巨建濤,安家良,史成斌,鄭頂立,棘廣恒.電渣重熔用低氟渣與Incoloy825合金中Al、Ti反應(yīng)性的研究[J].稀有金屬材料與工程,2020,49(1):233~240.[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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  • 收稿日期:2019-06-26
  • 最后修改日期:2019-09-16
  • 錄用日期:2019-09-17
  • 在線發(fā)布日期: 2020-02-16
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