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Materials 2018, 11(8), 1343; https://doi.org/10.3390/ma11081343

Thermodynamic Analysis of Ti3O5Nanoparticles Formed in Melt and Their Effects on Ferritic Steel Microstructure

1
School of Mechanical Engineering, Dongguan University of Technology, Dongguan 523808, China
2
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
3
State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
4
Department of Mechanical Engineering, University of South Florida, Tampa, FL 33620, USA
*
Authors to whom correspondence should be addressed.
Received: 11 June 2016 / Revised: 9 July 2018 / Accepted: 17 July 2018 / Published: 2 August 2018
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Abstract

Based on the Wagner’s formalism combined with mass conservation, a thermodynamic analysis method has been developed previously. This method enables the calculation of the equilibrium matrix composition, precipitate composition and precipitate total molar fraction for TixOy(s) in molten metal, which can be determined at any appropriate temperature. In this present study, the Ti3O5 phase precipitation and the quantitative relationship between the addition of Ti, O and Ti3O5 in the molten steel were studied using the thermodynamic model. Using the combined multipoint dispersion supply method, electromagnetic stirring and well-dispersed 5-nm Ti3O5 nanoparticles were fabricated in the ferrite matrix of the as-cast high-strength steel with 0.05 wt % Ti—0.002 wt % O. The as-cast microstructure was improved by the homogeneously dispersed Ti3O5 nanoparticles through heterogeneous nucleation and grain refinement. View Full-Text
Keywords: metallurgy; nanoparticles; thermodynamics analysis; microstructure; ferritic steel metallurgy; nanoparticles; thermodynamics analysis; microstructure; ferritic steel
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Wang, Y.; Zhou, M.; Pang, X.; Chen, X.; Wang, Z.; Volinsky, A.A.; Tang, H. Thermodynamic Analysis of Ti3O5Nanoparticles Formed in Melt and Their Effects on Ferritic Steel Microstructure. Materials 2018, 11, 1343.

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