Abstract
The solidification path of peritectic steel Q345 was calculated and compared with in-situ observations to investigate the effect of phase transition on the equilibrium partition coefficient. Subsequently, a thermodynamic model for calculating the equilibrium partition coefficient was established and thermodynamic calculations were performed under different phase configurations. Results indicate that L (liquid phase) + δ, L + δ + γ, and L + δ phases coexist in sequence during the solidification of peritectic steel Q345. The phase constitution of the mushy zone evidently affects the evolution of the equilibrium partition coefficient of solutes. The temperature dependence of the equilibrium partition coefficient was quantified through the regression analyses of C, Si, Mn, P, and S solutes under different phase configurations. The average equilibrium partition coefficients of Mn, Si, P, C, and S are 0.696, 0.615, 0.273, 0.2, and 0.033, respectively, thereby indicating the strongest segregation tendency for S and the weakest for Mn.
Highlights
The equilibrium partition coefficient describes the ratio of solute concentration in the solid and liquid phases during equilibrium solidification [1]
The equilibrium partition coefficient varies from 0 to 1 for most solutes in steel [2,5], thereby indicating that a solute may be rejected from the solid phase to the liquid phase, which enriches the liquid phase during solidification
To get fundamental data on the equilibrium partition coefficient of solute elements for peritectic steel Q345, the solidification path and phase transition of peritectic steel Q345 elements for peritectic steel Q345, the solidification path and phase transition of peritectic steel were studied via phase diagram calculations
Summary
The equilibrium partition coefficient describes the ratio of solute concentration in the solid and liquid phases during equilibrium solidification [1]. Equilibrium partition coefficients evaluated from binary or ternary systems were frequently used to simulate macrosegregation during the solidification of steel ingot or cast blank frequently used to simulate macrosegregation during the solidification of steel ingot or cast blank due due to lack of data [17,18]. The equilibrium partition coefficient of solutes should be should be determined within specific multicomponent steels for segregation prediction during determined within specific multicomponent steels for segregation prediction during solidification by solidification by considering phase constitution, temperature, and solute concentration. To get fundamental data on the equilibrium partition coefficient of solute elements for peritectic steel Q345, the solidification path and phase transition of peritectic steel Q345 elements for peritectic steel Q345, the solidification path and phase transition of peritectic steel were studied via phase diagram calculations.
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