AlN在Hi-B钢铁素体相中析出的形核机制  

Nucleation mechanism of precipitate of AlN in ferrite phase of Hi-B steel

作　　者：王海军[1] 付兵[1] 项利[1] 仇圣桃[1] 

机构地区：[1]钢铁研究总院连铸技术国家工程研究中心,北京100081

出　　处：《钢铁研究学报》2015年第10期40-45,共6页Journal of Iron and Steel Research

基　　金：国家自然科学基金委员会与上海宝山钢铁股份有限公司联合资助项目(50934009)

摘　　要：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。Nucleation mechanism of precipitate of AlN in ferrite phase of Hi-B steel was analysed by theoretical cal- culation method. The results show that the critical nucleation size of the secondary phase AlN particles decreases with precipitation temperature lowering at different nucleation mechanisms. Critical nucleation sizes are different for different nucleation mechanisms, however, critical nucleation sizes of homogeneous nucleation mechanism and grain boundary nucleation mechanism are close. Under the same temperature, the critical nucleation size of dislo- cation nucleation mechanism is the smallest. The fastest precipitation temperatures of the secondary phase AlN particles by dislocation nucleation mechanism, homogeneous nucleation mechanism and grain boundary nucleation mechanism are 1 273,1 193 and 1 293 K, respectively. When temperature is below 1 293 K, the precipitation nucle- ation mechanism of AlN in ferrite is mainly dislocation nucleation. While temperature is higher than 1 293 K, the precipitation nucleation mechanism of AlN in ferrite is mainly grain boundary nucleation.

关 键 词：高磁感取向硅钢 形核机制 ALN PTT曲线 

分 类 号：TG142.1[一般工业技术—材料科学与工程]