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Published on: February 5, 2022
Thermodynamic Analysis of Ti₃O₅Nanoparticles Formed in Melt and Their Effects on Ferritic Steel Microstructure
Yanlin Wang1,2, Meng Zhou3, Xiaolu Pang4
1School of Mechanical Engineering, Dongguan University of Technology, Dongguan 523808, China. Wangyanlin921@aliyun.com.
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 TiO(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.
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