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基于结晶器电磁搅拌对汽车板夹杂物的影响研究

Research on influence of mold electromagnetic stirring on inclusions in automotive steel sheets

  • 摘要: 本研究主要探讨了结晶器电磁搅拌对IF钢铸坯夹杂物的影响。结果表明,结晶器电磁搅拌对IF钢铸坯夹杂物类型无明显影响,主要夹杂物类型包括不规则形状及簇群状的Al2O3系、Al2O3-Ti2O3系、Al2O3-TiN系以及多边形Al2O3-Ti2O3-TiN系夹杂物和纯TiN系夹杂物。在夹杂物尺寸方面,IF钢铸坯夹杂物尺寸主要集中在1~10 μm,且结晶器电磁搅拌有助于使夹杂物趋于小型化,其中尺寸小于2.5 μm的显微夹杂物比例由52.48%增加到58.66%,而5~10 μm夹杂物比例则相应降低。此外,结晶器电磁搅拌在降低铸坯表面及皮下夹杂物方面效果显著。在电磁搅拌工况下,夹杂物数量密度为1.5~9.3个/mm2,相较于无搅拌工况下的4.4~15.6个/mm2,数量密度明显降低。无论是否进行电磁搅拌,铸坯夹杂物在铸坯厚度方向上的分布趋势一致,即随着距板坯表面距离的增加,非金属夹杂物数量密度显著增加。本研究为理解结晶器电磁搅拌在高等级汽车板生产中的作用提供了重要依据。

     

    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 Al2O3-based, Al2O3-Ti2O3-based, Al2O3-TiN-based, polygonal Al2O3-Ti2O3-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.

     

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