Thermodynamic Modelling on Nanoscale Growth of Magnesia Inclusion in Fe-O-Mg Melt
Abstract
:1. Introduction
2. Theoretical Modeling for Nano-MgO in Liquid Iron
2.1. Thermodynamic Modeling
2.2. Calculation Method
3. Results and Discussions
3.1. Thermodynamic Properties of Nano-MgO
3.2. Nucleation and Excess Oxygen for Mg-Deoxidation Reaction in Fe-O-Mg Melt
3.3. Gibbs Free Energy Changes for the Formation of Nano-MgO in Liquid Iron
3.4. Multi-Equilibria Thermodynamics of MgO in Liquid Iron
4. Conclusions
- (1)
- It is difficult for nano-magnesia to grow up into final bulk magnesia in final stage of Mg-deoxidation in liquid iron. The existence of the residual nanoscale magnesia is one of the important reason for the supersaturation ratio or the excess oxygen for MgO formation in liquid iron.
- (2)
- Numerical calculation results suggest that the solubility product of magnesium and oxygen for nano-MgO in liquid iron increased with the increasing magnesia products size. The experimental data about Mg-deoxidation in liquid iron are covered by the region between the thermodynamic curves of 2 nm magnesia and bulk-magnesia.
- (3)
- The previous Mg-deoxidation experiments are in the different thermodynamic states, and many previous experiments are close to the final equilibrium between bulk magnesia and liquid iron, but do not reach the final equilibrium because their partial product is nano-magnesia.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Author | logK | Year | ||||||
---|---|---|---|---|---|---|---|---|
Thermodynamic calculation | ||||||||
Sigworth et al. [10] | 7.86 | - | - | - | - | - | - | 1974 |
Gorobetz [11] | 9.24 | −250 | −380 | - | - | - | - | 1980 |
Kulikov [12] | 8.54 | −160 | −243 | - | - | - | - | 1985 |
Nadif et al. [13] | 7.75 | - | - | - | - | - | - | 1986 |
Turkdogan [14] | 7.74 | - | - | - | - | - | - | 1991 |
Satoh et al. [15] | 7.59 | - | - | - | - | - | - | 2009 |
Experiment result | ||||||||
Teplitskii et al. [16] | 5.12 | - | - | - | - | - | - | 1977 |
Nadif et al. [13] | 5.70 | - | - | - | - | - | - | 1986 |
Inoue et al. [17] | 7.8 ± 0.2 | −190 ± 60 | −290 ± 90 | - | - | - | - | 1994 |
Han et al. [18] | 6.03 | −106 | −161 | - | - | - | - | 1997 |
Itoh et al. [19] | 6.8 | −280 | −430 | −20,000 | 350,000 | 462,000 | −61,000 | 1997 |
Ohta et al. [20] | 7.86 | −300 | −460 | 16,000 | 37,000 | 48,000 | 48,000 | 1997 |
Seo and Kim [21] | 7.21 | −370 | −560 | 59,000 | 145,000 | 191,400 | 17,940 | 2000 |
Seo et al. [22] | 7.24 | −266 | −404 | −40,000 | 527,000 | 696,000 | −122,000 | 2003 |
[%O] | [%Mg] | |||
---|---|---|---|---|
0.01 | 0.001 | 0.0005 | 0.0001 | |
0.01 | 1737.801 | 173.780 | 86.890 | 17.378 |
0.005 | 868.900 | 86.890 | 43.445 | 8.689 |
0.0025 | 434.450 | 43.445 | 21.723 | 4.345 |
0.001 | 173.780 | 17.378 | 8.689 | 1.738 |
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Xiao, Y.; Lei, H.; Yang, B.; Wang, G.; Wang, Q.; Jin, W. Thermodynamic Modelling on Nanoscale Growth of Magnesia Inclusion in Fe-O-Mg Melt. Metals 2019, 9, 174. https://doi.org/10.3390/met9020174
Xiao Y, Lei H, Yang B, Wang G, Wang Q, Jin W. Thermodynamic Modelling on Nanoscale Growth of Magnesia Inclusion in Fe-O-Mg Melt. Metals. 2019; 9(2):174. https://doi.org/10.3390/met9020174
Chicago/Turabian StyleXiao, Yuanyou, Hong Lei, Bin Yang, Guocheng Wang, Qi Wang, and Wei Jin. 2019. "Thermodynamic Modelling on Nanoscale Growth of Magnesia Inclusion in Fe-O-Mg Melt" Metals 9, no. 2: 174. https://doi.org/10.3390/met9020174