Influence of Inclusions on Magnetic Properties of Al-Killed Non-oriented Silicon Steels

作者：Liu, Yulong; Zhu, Chengyi^*; Huang, Luoyi; Chen, Xinyuan; Li, Guangqiang

来源：JOM, 2022, 74(7): 2645-2655.

DOI：10.1007/s11837-022-05333-w

• ELECTRICAL STEEL
• GRAIN-SIZE
• FLUX DENSITY
• CORE LOSS
• TEXTURE
• SOLIDIFICATION
• MODEL

The influence of inclusions and microstructure on magnetic properties was investigated in calcium(Ca)-treated non-oriented silicon steels. The total number density of inclusions was reduced due to the removal of low melt point and calcium sulfide (CaS)-bearing inclusions. Inclusions containing manganese sulfide (MnS) decreased, while those with aluminum nitride (AlN) increased. The segregation concentration of Mn, S, Al, and N during the solidification process was calculated based on a simple microsegregation model. The results showed that the Ca treatment modulated the precipitation characteristics of MnS and AlN. An increase in the grain size was observed accompanied by a reduced number density of precipitates. The density of gamma-fiber texture increased, while that of the eta-fiber texture decreased. The core loss and magnetic induction decreased by 10.06% and 3.50%, respectively. These results indicated that an appropriate Ca treatment during the refining process could effectively modify the inclusions and reduce the core loss.