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The formation of abnormal microstructuresAbnormal microstructure in the central region of casting slabs could be inherited by the rolled sheet, resulting in banded structures that severely deteriorate the final mechanical propertiesMechanical properties. The abnormal microstructureAbnormal microstructure formation mechanism in the center of microalloyed steelMicroalloyed steel casting slab was investigated in this paper. The results showed that the abnormal microstructureAbnormal microstructure bainite clusters appeared in the center of the microalloyed steelMicroalloyed steel casting slab, which were caused by severe enrichment of C, Mn, and Cr elements. The enrichment of C, Mn, and Cr elements promotes the transformation of undercooled austenite to bainite at a lower cooling rate of 0.42 °C/s in the center of the casting slab based on the TTT curves and experimental results.

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Formation Mechanism of Abnormal Microstructure in the Center of Microalloyed Steel Casting Slab

  • 会议论文

  • 发表日期：

    2026年

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  • Zichao Wang,
  • Jiang Du,
  • Wanlin Wang,
  • Jie Zeng

摘要

The formation of abnormal microstructuresAbnormal microstructure in the central region of casting slabs could be inherited by the rolled sheet, resulting in banded structures that severely deteriorate the final mechanical propertiesMechanical properties. The abnormal microstructureAbnormal microstructure formation mechanism in the center of microalloyed steelMicroalloyed steel casting slab was investigated in this paper. The results showed that the abnormal microstructureAbnormal microstructure bainite clusters appeared in the center of the microalloyed steelMicroalloyed steel casting slab, which were caused by severe enrichment of C, Mn, and Cr elements. The enrichment of C, Mn, and Cr elements promotes the transformation of undercooled austenite to bainite at a lower cooling rate of 0.42 °C/s in the center of the casting slab based on the TTT curves and experimental results.