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- Title
Carbonitride Precipitation Kinetics Model During Continuous Casting of Ti Microalloyed Steel.
- Authors
Ji, Cheng; Chen, Tianci; Zhu, Miaoyong
- Abstract
TiN and Ti(C,N) are the main precipitates in Ti micro-alloyed steel during the continuous casting, which directly affect the microstructure and property of the slab. However, due to the solute segregation and the different cooling rates at different locations of the slab section, it is challenging to accurately predict the precipitation behavior of carbonitride during the continuous casting process using the existing thermodynamic model. Taking into account the solute segregation laws at the solid-liquid interface during continuous casting solidification and incorporating the influence of precipitates on solute segregation, this study proposes a model for coupled carbonitride precipitation and solute segregation by introducing dynamic solute partition coefficients. Based on this, a kinetic model is established to describe growth of TiN and Ti(C,N) precipitates during continuous cooling of the slab by utilizing the micro-element superposition method. The nano carbonitride will precipitate in the solid phase upon complete solidification of the slab. The macroscopic solute distribution at different positions of the slab, ranging from the center to the surface, was calculated using a segregation model that incorporates a convective coefficient. Through this, a precipitation model for nano-carbonitrides in Ti microalloyed steel is developed by incorporating the classical nucleation theory. The models are validated by comparing the predicted values of Ti carbonitride precipitation quantity and average precipitate size with experimental data at typical locations, including the surface, 1/4 position, and internal regions of the slab. The accuracy of the predictions reaches over 90 pct. This study enhances the comprehension of precipitation and growth mechanisms of carbonitride in Ti microalloyed steel, contributing to a more comprehensive understanding of this material system.
- Subjects
CONTINUOUS casting; PRECIPITATION (Chemistry) kinetics; PRECIPITATION (Chemistry); SOLID-liquid interfaces; CONTINUOUS processing; SOLIDIFICATION
- Publication
Metallurgical & Materials Transactions. Part A, 2024, Vol 55, Issue 8, p3045
- ISSN
1073-5623
- Publication type
Article
- DOI
10.1007/s11661-024-07457-x