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<p>The microstructure evolution, precipitation behavior, and hardness changes of Ti microalloyed low-carbon high-strength steel in the range of 0-0.035&#xa0;wt.% Zr during isothermal holding after austenite deformation were studied. Isothermal transformation kinetics and isothermal precipitation kinetics models were established for three tested steels at 600&#xa0;°C for different isothermal times (10, 32, 63, 100, 316, and 1000&#xa0;s), and the precipitation kinetics and their interaction with austenite ferrite transformation, as well as the influence of Zr, were discussed. The results indicate that as the isothermal time increases, the proportion of ferrite in the tested steel increases, while the proportion of martensite/bainite decreases. The addition of Zr inhibited the isothermal phase transformation, delayed the precipitation end time, and promoted the formation of acicular ferrite and bainite. With the increase of Zr content, the solid solubility of Ti in the matrix increases, the grain size of ferrite decreases, the nucleation incubation period of precipitation is shortened, and the nucleation rate increases. Isothermal precipitation occurs after the onset of austenite ferrite phase transformation. The main precipitates during the isothermal process were the carbide of Ti, with a lattice constant of about 0.436&#xa0;nm, exhibiting a Baker–Nutting (BN) relationship with the ferrite matrix. As the Zr content increased from 0 to 0.035&#xa0;wt.%, the fine grain strengthening increment of Ti microalloyed low-carbon high-strength steel increased from 260 to 306&#xa0;MPa.</p>

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Effect of Zr on Microstructure Evolution, Precipitation Behavior, and Mechanical Properties of Ti Microalloyed Low-Carbon High-Strength Steel during the Coiling Process

  • 期刊论文

  • 发表日期：

    2025年5月9日

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  • Hanyu Luo,
  • Chao Lu,
  • Xuegang Xiong,
  • Chuangwei Wang,
  • Jianchun Cao

摘要

The microstructure evolution, precipitation behavior, and hardness changes of Ti microalloyed low-carbon high-strength steel in the range of 0-0.035 wt.% Zr during isothermal holding after austenite deformation were studied. Isothermal transformation kinetics and isothermal precipitation kinetics models were established for three tested steels at 600 °C for different isothermal times (10, 32, 63, 100, 316, and 1000 s), and the precipitation kinetics and their interaction with austenite ferrite transformation, as well as the influence of Zr, were discussed. The results indicate that as the isothermal time increases, the proportion of ferrite in the tested steel increases, while the proportion of martensite/bainite decreases. The addition of Zr inhibited the isothermal phase transformation, delayed the precipitation end time, and promoted the formation of acicular ferrite and bainite. With the increase of Zr content, the solid solubility of Ti in the matrix increases, the grain size of ferrite decreases, the nucleation incubation period of precipitation is shortened, and the nucleation rate increases. Isothermal precipitation occurs after the onset of austenite ferrite phase transformation. The main precipitates during the isothermal process were the carbide of Ti, with a lattice constant of about 0.436 nm, exhibiting a Baker–Nutting (BN) relationship with the ferrite matrix. As the Zr content increased from 0 to 0.035 wt.%, the fine grain strengthening increment of Ti microalloyed low-carbon high-strength steel increased from 260 to 306 MPa.