Precipitation kinetics of complex precipitate in multicomponent systems  

作　　者：Yong Yang Tian-rui Li Tao Jia Zhao-dong Wang 

机构地区：[1]State Key Laboratory of Rolling and Automation,Northeastern University, Shenyang 110819, Liaoning, China

出　　处：《Journal of Iron and Steel Research International》2018年第10期1086-1093,共8页

基　　金：This work was financially supported by the National Natural Science Foundation of China （51234002）.

摘　　要：A kinetic model based on the classical nucleation and growth theory has been proposed to predict the precipitation behavior of complex precipitate. The method for calculating absolute solution temperature, which is an important guidance for determining solution treatment temperature, is also proposed based on thermodynamic model. In the model, nucleation of the second phase is assumed to be controlled by the effective diffusion, which involves the bulk diffusion and dislocation pipe diffusion, and growth is controlled by the bulk diffusion of forming elements. The interfacial energy of complex precipitate is calculated by the linear interpolation method, and the effects of alloying elements on precipitation behavior are manifested using weighted means of their diffusivities and concentration. The predictions were compared with the experimental measurements, and a good agreement was obtained.A kinetic model based on the classical nucleation and growth theory has been proposed to predict the precipitation behavior of complex precipitate. The method for calculating absolute solution temperature, which is an important guidance for determining solution treatment temperature, is also proposed based on thermodynamic model. In the model, nucleation of the second phase is assumed to be controlled by the effective diffusion, which involves the bulk diffusion and dislocation pipe diffusion, and growth is controlled by the bulk diffusion of forming elements. The interfacial energy of complex precipitate is calculated by the linear interpolation method, and the effects of alloying elements on precipitation behavior are manifested using weighted means of their diffusivities and concentration. The predictions were compared with the experimental measurements, and a good agreement was obtained.

关 键 词：Complex precipitate CARBIDE Kinetic model Nucleation and growth theory Absolute solution temperature 

分 类 号：O241.3[理学—计算数学] TU855[理学—数学]