This work studies the impact of the carbon diffusion on the growth kinetics of austenite and the solute segregation,by utilizing the phase-field(PF)method to simulate the solidification of a Fe-C binary alloy.It is re...This work studies the impact of the carbon diffusion on the growth kinetics of austenite and the solute segregation,by utilizing the phase-field(PF)method to simulate the solidification of a Fe-C binary alloy.It is revealed that increasing the ratio of the carbon diffusion coefficient in solid to that in liquid is advantageous in reducing the solute segregation,and a novel microsegregation model is developed based on the quantitative analysis of the results from PF simulations.The simplified one-dimensional diffusion simulation is employed to analyse the quantitative relationship between the parameters of the proposed microsegregation model and the properties of materials.The universality and reliability of the new microsegregation model are then validated by comparing with the experimental data of various alloy systems.These findings contribute to our comprehension of the fundamental theory of solidification and also provide a potential and promising approach to controlling the solidification microstructure.展开更多
This study provides a potentially viable approach to manipulate the precipitation of primary carbides in molten steel by modifying the diffusion coefficient of carbon.The solidification process of a Fe-C alloy is simu...This study provides a potentially viable approach to manipulate the precipitation of primary carbides in molten steel by modifying the diffusion coefficient of carbon.The solidification process of a Fe-C alloy is simulated using the multi-phase-field method,and we focus on the impact of diffusion coefficient of carbon on the solute segregation and cementite precipitation.Two benefits have been revealed as the ratio of the diffusivities of carbon in solid to that in liquid is increased.A potential advantage is the re-duction in the volume fraction of the residual liquid enriched with carbon during the late solidification.Furthermore,the magnitude of the chemical driving force for the phase transition of cementite precip-itation will be lower.The combined influence of both factors results in an exponential decrease in the volume fraction of cementite formed at the end of solidification.展开更多
基金supported by the National Science and Technology Major Project(Grant No.J2019-VI-0019-0134)the National Natural Science Foundation of China(Grant No.52203301)+1 种基金the China Postdoctoral Science Foundation(Grant No.2021TQ0335)the Liaoning Province Science and Technology Plan Joint Fund(Doctoral Research Initiation Project)(Grant No.2024-BSLH-195).
文摘This work studies the impact of the carbon diffusion on the growth kinetics of austenite and the solute segregation,by utilizing the phase-field(PF)method to simulate the solidification of a Fe-C binary alloy.It is revealed that increasing the ratio of the carbon diffusion coefficient in solid to that in liquid is advantageous in reducing the solute segregation,and a novel microsegregation model is developed based on the quantitative analysis of the results from PF simulations.The simplified one-dimensional diffusion simulation is employed to analyse the quantitative relationship between the parameters of the proposed microsegregation model and the properties of materials.The universality and reliability of the new microsegregation model are then validated by comparing with the experimental data of various alloy systems.These findings contribute to our comprehension of the fundamental theory of solidification and also provide a potential and promising approach to controlling the solidification microstructure.
基金supported by the National Sci-ence and Technology Major Project(No.J2019-VI-0019-0134)the National Natural Science Foundation of China(No.52203301)+1 种基金the China Postdoctoral Science Foundation(No.2021TQ0335)the Strategic Priority Research Program of the Chinese Academy of Sci-ences(No.XDC04040202).
文摘This study provides a potentially viable approach to manipulate the precipitation of primary carbides in molten steel by modifying the diffusion coefficient of carbon.The solidification process of a Fe-C alloy is simulated using the multi-phase-field method,and we focus on the impact of diffusion coefficient of carbon on the solute segregation and cementite precipitation.Two benefits have been revealed as the ratio of the diffusivities of carbon in solid to that in liquid is increased.A potential advantage is the re-duction in the volume fraction of the residual liquid enriched with carbon during the late solidification.Furthermore,the magnitude of the chemical driving force for the phase transition of cementite precip-itation will be lower.The combined influence of both factors results in an exponential decrease in the volume fraction of cementite formed at the end of solidification.
