Abstract:
This study primarily investigates the impact of mold electromagnetic stirring on inclusions in interstitial-free steel slabs. The results indicate that mold electromagnetic stirring has no significant effect on the types of inclusions in IF steel slabs, with the primary inclusion types being irregular and clustered Al
2O
3-based, Al
2O
3-Ti
2O
3-based, Al
2O
3-TiN-based, polygonal Al
2O
3-Ti
2O
3-TiN-based, and pure TiN-based inclusions. In terms of inclusion size, the inclusions in IF steel slabs are primarily concentrated between 1-10 μm, and mold electromagnetic stirring contributes to the miniaturization of inclusions, with the proportion of microscopic inclusions with the size less than 2.5 μm increasing from 52.48% to 58.66%, while the proportion of inclusions between 5-10 μm decreases accordingly. Furthermore, mold electromagnetic stirring demonstrates a significant effect in reducing non-metallic inclusions on the slab surface and subsurface. Under mold electromagnetic stirring conditions, the inclusion number density is 1.5-9.3 mm
-2, which is significantly lower compared to 4.4-15.6 mm
-2 under non-stirring conditions. Regardless of whether mold electromagnetic stirring is applied, the distribution trend of slab inclusions in the thickness direction is consistent, with the number density of non-metallic inclusions increasing significantly as the distance from the slab surface increases. This study provides an important basis for understanding the production of high-grade automotive steel using mold electromagnetic stirring.