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MicrostructureMicrostructure characterizationCharacterization was performed on an industrially produced hot-rolled 6.35 mm S700MC steelSteel with a minimum yield strengthStrength of 700 MPa. Electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) were employed to analyze grain sizeGrain size, dislocation densityDensity, and precipitationPrecipitation characteristics. The results demonstrated a strong correlation between the actual and theoretical yield strengthsStrength based on solid solutionSolid solutions strengthening, grain sizeGrain size, dislocation densityDensity, and precipitationPrecipitation contributions. Utilizing the same steelSteel chemistry, a new 6.35 mm S760MC steelSteel was developed to achieve a minimum yield strengthStrength of 760 MPa. An industrial trial was performed with a new cooling strategy to optimize the grain sizeGrain size and enhance the mechanical propertiesMechanical properties to meet the 760 MPa requirement. Subsequent microstructureMicrostructure characterizationCharacterization was conducted on a trial material to validate the theoretical yield strengthStrength prediction. This study demonstrates the effective design and processing optimization of high-strengthStrength hot-rolled steelSteel through microstructural engineering and predictive modeling.

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Optimization of Cooling Practice to Increase the Strength of Hot Rolled S760MC High-Strength Steel

  • 会议论文

  • 发表日期：

    2026年

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  • Rekha M. Y. Rao,
  • Brian K. Lin,
  • Dmitri M. Sidorenko,
  • Ashwin Kannan Iyengar,
  • Bertram Ehrhardt

摘要

MicrostructureMicrostructure characterizationCharacterization was performed on an industrially produced hot-rolled 6.35 mm S700MC steelSteel with a minimum yield strengthStrength of 700 MPa. Electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) were employed to analyze grain sizeGrain size, dislocation densityDensity, and precipitationPrecipitation characteristics. The results demonstrated a strong correlation between the actual and theoretical yield strengthsStrength based on solid solutionSolid solutions strengthening, grain sizeGrain size, dislocation densityDensity, and precipitationPrecipitation contributions. Utilizing the same steelSteel chemistry, a new 6.35 mm S760MC steelSteel was developed to achieve a minimum yield strengthStrength of 760 MPa. An industrial trial was performed with a new cooling strategy to optimize the grain sizeGrain size and enhance the mechanical propertiesMechanical properties to meet the 760 MPa requirement. Subsequent microstructureMicrostructure characterizationCharacterization was conducted on a trial material to validate the theoretical yield strengthStrength prediction. This study demonstrates the effective design and processing optimization of high-strengthStrength hot-rolled steelSteel through microstructural engineering and predictive modeling.