东北大学学报（自然科学版）

东北大学学报（自然科学版） ›› 2022, Vol. 43 ›› Issue (5): 652-659.DOI: 10.12068/j.issn.1005-3026.2022.05.007

• 材料与冶金 • 上一篇    下一篇

电渣重熔Inconel 625合金铝钛氧化的热力学分析

刘福斌1， 张海宝1， 高俊哲2， 耿鑫1   

  1. (1. 东北大学 冶金学院， 辽宁 沈阳110819; 2. 冶金自动化研究设计院， 北京100071)
  • 修回日期:2021-07-23 接受日期:2021-07-23 发布日期:2022-06-20
  • 通讯作者: 刘福斌
  • 作者简介:刘福斌(1978-)，男，黑龙江佳木斯人，东北大学副教授.
  • 基金资助:
    山西省关键核心技术和共性技术研发攻关专项资助项目(20201102017)； 2018年江苏省双创团队项目.

Thermodynamic Analysis of Aluminum and Titanium Oxidation During Electroslag Remelting Process of Inconel 625 Alloy

LIU Fu-bin1， ZHANG Hai-bao1， GAO Jun-zhe2， GENG Xin1   

  1. 1. School of Metallurgy， Northeastern University， Shenyang 110819， China; 2. Automation Research and Design Institute of Metallurgical Industry， Beijing 100071， China.
  • Revised:2021-07-23 Accepted:2021-07-23 Published:2022-06-20
  • Contact: LIU Fu-bin
  • About author:-
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摘要： 针对电渣重熔Inconel 625合金过程中Al和Ti含量的控制问题，通过渣-金平衡实验和基于离子-分子共存理论建立作用浓度热力学模型的研究，探索渣系组元对Al，Ti烧损的影响机制.研究了渣系各组元活度及活度比与渣系成分间的关系.研究结果表明:当TiO2的质量分数为3%时，渣系能较好地控制Al和Ti氧化的效果.炉渣中的CaO会引起合金中Al和Ti不同程度的烧损，过量CaO会导致合金发生“烧Ti增Al”现象.升高温度可以抑制合金中Al的氧化，而降低温度可以抑制Ti的氧化.在1823K下，能够有效减少Inconel 625合金电渣重熔过程中Al和Ti烧损的渣系组成为w(CaF2)=50%~60%，w(Al2O3)=15%~20%，w(CaO)=14%~20%，w(MgO)=3%，w(TiO2)=2.5%~3.5%.

关键词: Inconel 625合金;电渣重熔;离子-分子共存理论;热力学;铝钛氧化

Abstract: Slag-metal equilibrium experiments and a thermodynamic model of the action concentration based on the ion and molecule coexistence theory (IMCT) were used to study in controlling Al and Ti elements during the electroslag remelting (ESR) process of Inconel 625 alloy. The influencing mechanisms of slag components on burning loss of Al and Ti were investigated and the relationship of the activity and its ratio for each slag component with chemical composition in the system was provided， respectively. The results indicate that the slag system with the TiO2 of 3% has a good effect on the Al and Ti preservation. The CaO in the slag will cause different degrees of burning loss of Al and Ti， in which the excess CaO can lead to the phenomenon of burning the Ti and increasing the Al content. The Al oxidation is restrained with the temperature， in contrast to the Ti oxidation. Eventually， at the 1823K， the composition of the slag system is selected as w(CaF2)=50%~60%， w(Al2O3)=15%~20%， w(CaO)=14%~20%， w(MgO)=3% and w(TiO2)=2.5%~3.5%， respectively， so as to reduce the Al and Ti burnout effectively during the ESR process of Inconel 625.

Key words: Inconel 625 alloy; electroslag remelting; ion and molecule coexistence theory; thermodynamics; oxidation of Al and Ti

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