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<p>Effects of solute rare earth (RE) on continuous cooling transformation of a low-carbon weathering steel are investigated in this paper, detailed by the methods of continuous cooling transformation test, dilatometry, high-temperature laser scanning confocal microscopy, inductively coupled plasma mass spectrometry and time-of-flight secondary ion mass spectrometry. The results show that RE notably delays the transformation of ferrite and bainite. At moderate cooling rates (1–5 °C&#xa0;s<sup>−1</sup>), RE hinders the diffusion of carbon, lowers the start temperature of ferrite phase transformation, and narrows the range of ferrite phase transformation cooling rates. At high cooling rates (20–50 °C&#xa0;s<sup>−1</sup>), the solid-solubilized RE pinned at grain boundaries reduces the grain boundary energy, increases the transformation resistance, lowers the start temperature of bainite transformation, significantly refines the bainite grain size, and greatly increases the Vickers hardness of the steel, When the cooling rate reaches 50 °C&#xa0;s<sup>−1</sup>, the hardness of RE280 steel with the highest RE content is 87.1HV0.5 higher than that of base steel. The amount of solid solution RE elements rises with an increase in RE content. The enrichment of RE at the grain boundaries has inhibiting effect on the intragranular nucleation of ferrite and bainite in austenite.</p>

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Influence of Rare Earth Elements on Continuous Cooling Transformation Behavior of a Low-Carbon Weathering Steel

  • 期刊论文

  • 发表日期：

    2025年2月6日

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  • Tao Sun,
  • Zhong Xi,
  • Hailin Xiao,
  • Tengshi Liu,
  • Xintong Lian,
  • Han Dong

摘要

Effects of solute rare earth (RE) on continuous cooling transformation of a low-carbon weathering steel are investigated in this paper, detailed by the methods of continuous cooling transformation test, dilatometry, high-temperature laser scanning confocal microscopy, inductively coupled plasma mass spectrometry and time-of-flight secondary ion mass spectrometry. The results show that RE notably delays the transformation of ferrite and bainite. At moderate cooling rates (1–5 °C s−1), RE hinders the diffusion of carbon, lowers the start temperature of ferrite phase transformation, and narrows the range of ferrite phase transformation cooling rates. At high cooling rates (20–50 °C s−1), the solid-solubilized RE pinned at grain boundaries reduces the grain boundary energy, increases the transformation resistance, lowers the start temperature of bainite transformation, significantly refines the bainite grain size, and greatly increases the Vickers hardness of the steel, When the cooling rate reaches 50 °C s−1, the hardness of RE280 steel with the highest RE content is 87.1HV0.5 higher than that of base steel. The amount of solid solution RE elements rises with an increase in RE content. The enrichment of RE at the grain boundaries has inhibiting effect on the intragranular nucleation of ferrite and bainite in austenite.