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<p>The present study investigates the effects of intercritical deformation of low carbon high-strength steel on the formation of deformation induced ferrite, the formation and themechanical stability of retained austenite. In addition, the strengthening mechanism of intercritical deformation rolling followed by bainite isothermal treatment steel was quantitatively characterized. The result shows that the intercritical deformation promotes the nucleation of ferrite at grain boundaries and within grains, and refines the grains. The grain sizes of the undeformed, 20 and 40% deformed samples are 18.7, 13.4 and 10.3&#xa0;μm, respectively. The yield strength, ultimate tensile strength and elongation of intercritical deformation rolling followed by bainite isothermal treatment steel are 1133, 1145&#xa0;MPa and 15.6%, respectively, and the yield strength comes from grain boundary strengthening (239.8&#xa0;MPa), solid solution strengthening (252.4&#xa0;MPa), dislocation strengthening (186.3&#xa0;MPa), and precipitation strengthening (454.5&#xa0;MPa). Additionally, deformation increases the amount of retained austenite, and different strain stretching shows that the mechanical stability of film-like retained austenite is greater than that of block retained austenite</p>

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Study on Strengthening and Toughening of Intercritical Rolling Followed by Bainite Isothermal Treatment Steel

  • 期刊论文

  • 发表日期：

    2025年6月18日

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  • Shouhang Ma,
  • Yaqiang Tian,
  • Shuo Yao,
  • Yingli Wei,
  • Jinying Song,
  • Liansheng Chen,
  • Mingshan Zhang

摘要

The present study investigates the effects of intercritical deformation of low carbon high-strength steel on the formation of deformation induced ferrite, the formation and themechanical stability of retained austenite. In addition, the strengthening mechanism of intercritical deformation rolling followed by bainite isothermal treatment steel was quantitatively characterized. The result shows that the intercritical deformation promotes the nucleation of ferrite at grain boundaries and within grains, and refines the grains. The grain sizes of the undeformed, 20 and 40% deformed samples are 18.7, 13.4 and 10.3 μm, respectively. The yield strength, ultimate tensile strength and elongation of intercritical deformation rolling followed by bainite isothermal treatment steel are 1133, 1145 MPa and 15.6%, respectively, and the yield strength comes from grain boundary strengthening (239.8 MPa), solid solution strengthening (252.4 MPa), dislocation strengthening (186.3 MPa), and precipitation strengthening (454.5 MPa). Additionally, deformation increases the amount of retained austenite, and different strain stretching shows that the mechanical stability of film-like retained austenite is greater than that of block retained austenite