中文摘要：

研究了50W540型无取向硅钢中MnS粒子在300-700℃时效处理0.75-24 h不同时间时效析出行为与铁损变化的关系。结果表明,α-Fe基体中过饱和的Mn、S原子以MnS粒子形式沿位错析出,Mn原子的扩散距离是析出行为的制约因素。700℃时效时过饱和度低、Mn扩散快而MnS粒子易粗化,铁损降低。400-600℃时效时过饱和度高、MnS粒子析出数量增多,铁损升高。400℃以下时效时过饱和度很高,但Mn扩散慢,使细小MnS粒子难以析出且铁损无明显变化。

英文摘要：

The relationship between the aging behavior of MnS particles in 50W540 non-oriented silicon steel aged at 300-700℃ for 0. 75-24h and the core losses was investigated. The results show that the oversaturated Mn and S atoms precipitate along dislocations in the form of MnS particles. The diffusion distance of Mn atoms is the restraining factor for the precipitation behavior. When aging at 700 ℃, the supersaturation is low, the diffusion of Mn atoms is fast, MnS particles are easily coarsened, and the core loss is reduced. While aging at 400-600 ℃ , the supersaturation is high, the number of MnS particles precipitated is large, and the core loss is increased. The MnS particles can hardly be precipitated aging at temperature below 400 ℃ though the supersaturation is high,while the Mn atoms diffuse slowly and therefore core loss has no substantial change.