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通过理论计算的方法,系统分析了AlN在Hi-B钢铁素体中的析出形核机制。结果表明,第二相AlN粒子不同析出形核机制下的临界形核尺寸随着温度的降低而降低,形核机制不同,临界形核尺寸不相同,但均匀形核和晶界形核的临界形核尺寸较为接近,同一温度条件下,位错形核的临界形核尺寸最小。第二相AlN粒子以位错形核、均匀形核、晶界形核3种形核机制形核的最快析出温度分别为1 273、1 193、1 293K。同时,温度在1 293K以下时,取向硅钢中AlN在铁素体中以位错形核为主,温度高于1 293K后,AlN的形核机制以晶界形核为主。
Through theoretical calculation method, the precipitation mechanism of AlN in Hi-B steel ferrite was systematically analyzed. The results show that the critical nucleation size of AlN particles in the second phase decreases with the decrease of the temperature. The nucleation mechanism is different and the critical nucleation size is different. However, the critical nucleation of homogeneous nucleation and grain boundary nucleation The nucleation size is relatively close. Under the same temperature condition, the critical nucleation size of dislocation nucleation is the smallest. The second phase AlN particles were dislocated and homogeneously nucleated. The fastest nucleation temperatures of the nucleation modes of the nucleation sites of the nucleation sites were 1 273, 1 193 and 1 293K, respectively. Meanwhile, when the temperature is below 1 293K, AlN in oriented silicon steel is dominated by dislocation nucleation in the ferrite. When the temperature is higher than 1 293K, the nucleation mechanism of AlN is dominated by grain boundary nucleation.