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This study investigates the influence of banded segregation defects on the microstructureMicrostructure and mechanical propertiesMechanical properties of wear-resistant steelSteel, proposing effective strategies for their control. Experimental results revealed that the banded defectsBanded defects exhibited increasing contrast, width, and interfaceInterface clarity from the surface toward the center of the plate. The banded defectsBanded defects consisted of granular bainite and M/A islands, contrasting with the surrounding ferrite-pearlite matrix. This microstructural heterogeneity originated from severe positive segregation of alloying elements (C, Mn, Cr, Mo) within the banded regions, significantly increasing the hardness variability in the thickness direction of the rolled plate. Besides, the impact energy was marginally higher at the center compared to the near-surface region. The industrial experiments confirm a direct correlation between banded defectsBanded defects in the rolled product and initial solidificationSolidification segregation. By implementing a reduced electromagnetic stirring current to narrow the equiaxed crystal zone, the severe banded defectsBanded defects at the plate center were effectively mitigated.

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Research and Control Strategies for Banded Defects in Wear-Resistant Steel

  • 会议论文

  • 发表日期：

    2026年

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  • Hao Geng,
  • Fei-fei Yang,
  • Haibo Li,
  • Yun Han

摘要

This study investigates the influence of banded segregation defects on the microstructureMicrostructure and mechanical propertiesMechanical properties of wear-resistant steelSteel, proposing effective strategies for their control. Experimental results revealed that the banded defectsBanded defects exhibited increasing contrast, width, and interfaceInterface clarity from the surface toward the center of the plate. The banded defectsBanded defects consisted of granular bainite and M/A islands, contrasting with the surrounding ferrite-pearlite matrix. This microstructural heterogeneity originated from severe positive segregation of alloying elements (C, Mn, Cr, Mo) within the banded regions, significantly increasing the hardness variability in the thickness direction of the rolled plate. Besides, the impact energy was marginally higher at the center compared to the near-surface region. The industrial experiments confirm a direct correlation between banded defectsBanded defects in the rolled product and initial solidificationSolidification segregation. By implementing a reduced electromagnetic stirring current to narrow the equiaxed crystal zone, the severe banded defectsBanded defects at the plate center were effectively mitigated.