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<p>The study presents the obtained true stress–strain curves of 31MnTiB high-strength low-alloy steel. Hot plastic deformation was conducted at various temperatures ranging from 900 – 1100&#xa0;°C and strain rates of 0.1–10&#xa0;s<sup>−1</sup>. Based on the establishment of constitutive equation, the average activation energy of 31MnTiB HSLA-type steel for hot deformation is calculated to be 366.386&#xa0;kJ⋅mol<sup>−1</sup>. The study has developed instability maps for plastic flow by employing the instability criteria of Prasad and Seshacharyulu. Based on the dynamic material model of 31MnTiB HSLA steel, processing maps have been developed. By overlaying the previously established instability and power dissipation maps, these maps were created. The processing maps show a stable domain that ranges from 930 to 980&#xa0;°C, and a strain rate of 0.1&#xa0;s<sup>−1</sup> with peak efficiency of power dissipation, approx. 40%. The analyzed steel was characterized by a martensitic-bainitic microstructure, regardless of the temperature applied, across a wide range of cooling rates. A finer-grained microstructure was observed when specimens were deformed at lower temperatures, irrespective of the cooling rate used, corresponding with the established processing maps.</p>

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Constitutive equation and processing maps of 31MnTiB HSLA-type steel

  • 期刊论文

  • 发表日期：

    2025年2月21日

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  • Mariusz Król,
  • Przemysław Snopiński,
  • Tomasz Tański,
  • Marek Opiela,
  • Monika Chomiak,
  • Adam Czech

摘要

The study presents the obtained true stress–strain curves of 31MnTiB high-strength low-alloy steel. Hot plastic deformation was conducted at various temperatures ranging from 900 – 1100 °C and strain rates of 0.1–10 s−1. Based on the establishment of constitutive equation, the average activation energy of 31MnTiB HSLA-type steel for hot deformation is calculated to be 366.386 kJ⋅mol−1. The study has developed instability maps for plastic flow by employing the instability criteria of Prasad and Seshacharyulu. Based on the dynamic material model of 31MnTiB HSLA steel, processing maps have been developed. By overlaying the previously established instability and power dissipation maps, these maps were created. The processing maps show a stable domain that ranges from 930 to 980 °C, and a strain rate of 0.1 s−1 with peak efficiency of power dissipation, approx. 40%. The analyzed steel was characterized by a martensitic-bainitic microstructure, regardless of the temperature applied, across a wide range of cooling rates. A finer-grained microstructure was observed when specimens were deformed at lower temperatures, irrespective of the cooling rate used, corresponding with the established processing maps.