Abstract: The precipitation mechanism of AIN in high magnetic induction oriented silicon steel during the soaking process is systematically analyzed by the method of combining thermodynamics and kinetic calculations. The calculation results show that, at the soaking temperature of high magnetic induction oriented silicon steel, AIN in the  α+γ two-phase and has the thennodynamic precipitation conditions. With uniform nucleation, grain boundary nucleation and dislocation nucleation three kinds of mechanisms, the critical nucleation size of AIN is in the same order of magnitude and decreases with decreasing temperature. At the same temperature, the critical nucleation work of AIN grain boundary nucleation is the smallest and the relative nucleation rate is the largest, that is, grain boundary nucleation is easier to occur. The fastest precipitation temperatures for uniform nucleation, grain boundary nucleation and dislocation nucleation of AIN in a phase and 7 phase are 1203 K, 1303 K, 1243 K and 1213 K, 1305 K, 1233 K, respectively. AIN mainly nucleates at grain boundaries at soaking temperature.

Key words: Thennodynamics, Kinetics, High Magnetic Induction Oriented Silicon Steel, AIN, Nucleation Mechanism ,

摘要： 通过热力学和动力学计算相结合的方法，系统地分析了高磁感取向硅钢中A1N在均热过程中的析出机 制。计算结果表明，在高磁感取向硅钢的均热温度下AIN处在α+γ 两相区，同时具备热力学析出条件。在均匀形核、晶界形核和位错形核3种机制下,A1N的临界形核尺寸处在同一数量级且随温度降低而减小。相同温度下， A1N晶界形核的临界形核功最小，相对形核率最大，即较易发生晶界形核。A1N在α相和γ相中均匀形核、晶界形 核和位错形核的最快析出温度分别为1203 K、1303 K、1243 K和1213 K、1305 K、1233 K。 AIN在均热温度下以晶界形核为主。