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<p>The effects of isothermal treatment and rolling on the microstructure and mechanical properties of low carbon manganese steel were investigated using optical microscopy, scanning electron microscopy and transmission electron microscopy. The isothermal temperature affects the precipitation particle size, morphology, quantity and distribution characteristics. As the isothermal temperature increases from 500 to 700&#xa0;°C, the microstructure was gradually transformed from bainite and ferrite to ferrite and pearlite, and further transformed to ferrite and martensite. The contribution of precipitation strengthening exceeds 120&#xa0;MPa at an isothermal temperature of 600&#xa0;°C. With the increase in the cooling rate, the lath characteristics of bainite becomes more obvious, and the transformation of granular bainite to lath bainite is accelerated. Under a certain rolling process, the strength of the high nitrogen steel is 10-50&#xa0;MPa higher than that of the low-nitrogen steel. 180° cold bending test results show that there is no crack on the surface and sides of the specimen, indicating good cold work formability.</p>

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Effect of Isothermal Treatment and Rolling on the Microstructure and Properties of Low Carbon Manganese Steel

  • 期刊论文

  • 发表日期：

    2025年2月14日

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  • Rendong Liu,
  • Xiaonan Wang,
  • Xin Xu,
  • Chenshuo Cui,
  • Dong Lv,
  • Qian Sun,
  • Zheng Cao,
  • Lijia He,
  • Fei Teng,
  • Wenlu Fan,
  • Zhu Chen,
  • Rong Wang,
  • Jianxia Lin,
  • Tinting Wang,
  • Minfu Xia

摘要

The effects of isothermal treatment and rolling on the microstructure and mechanical properties of low carbon manganese steel were investigated using optical microscopy, scanning electron microscopy and transmission electron microscopy. The isothermal temperature affects the precipitation particle size, morphology, quantity and distribution characteristics. As the isothermal temperature increases from 500 to 700 °C, the microstructure was gradually transformed from bainite and ferrite to ferrite and pearlite, and further transformed to ferrite and martensite. The contribution of precipitation strengthening exceeds 120 MPa at an isothermal temperature of 600 °C. With the increase in the cooling rate, the lath characteristics of bainite becomes more obvious, and the transformation of granular bainite to lath bainite is accelerated. Under a certain rolling process, the strength of the high nitrogen steel is 10-50 MPa higher than that of the low-nitrogen steel. 180° cold bending test results show that there is no crack on the surface and sides of the specimen, indicating good cold work formability.