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<p>In the conventional quenching and partitioning (Q&amp;P) process, the so-called film-like austenite, which is generally fabricated by decreasing the quenching temperatures, oftentimes contains a high C content of up to 1.2&#xa0;wt.%, which is unfavorable for improving the ductility. Here, we combine the quenching with isochronal partitioning (Q&amp;IP) to obtain the newly Q&amp;IP steel, featuring the film-like austenite with a slightly reduced C content of 0.98&#xa0;wt.%. As compared with the traditional Q&amp;P steel fabricated by quenching and isothermal partitioning, the Q&amp;IP steel exhibits higher yield and ultimate tensile strengths (1168 ± 8.7&#xa0;MPa and 1722 ± 10.2&#xa0;MPa, respectively) and good ductility (with a uniform elongation of 13.2 ± 0.2%), due to the combination of the enhanced dislocation plasticity, the higher back stress hardening, and the durable transformation-induced plasticity effect. Applying a thermo-kinetic theory of generalized stability, we further demonstrate that the increased strength and good plasticity in the Q&amp;IP steel come from the phase transformations with high thermodynamic driving forces and high generalized stability.</p> Graphical abstract <p></p>

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Improving strength–ductility synergy in a low-alloy steel via quenching and isochronal C partitioning

  • 期刊论文

  • 发表日期：

    2025年3月7日

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  • Y. Wang,
  • L. K. Huang,
  • K. X. Song,
  • F. Liu

摘要

In the conventional quenching and partitioning (Q&P) process, the so-called film-like austenite, which is generally fabricated by decreasing the quenching temperatures, oftentimes contains a high C content of up to 1.2 wt.%, which is unfavorable for improving the ductility. Here, we combine the quenching with isochronal partitioning (Q&IP) to obtain the newly Q&IP steel, featuring the film-like austenite with a slightly reduced C content of 0.98 wt.%. As compared with the traditional Q&P steel fabricated by quenching and isothermal partitioning, the Q&IP steel exhibits higher yield and ultimate tensile strengths (1168 ± 8.7 MPa and 1722 ± 10.2 MPa, respectively) and good ductility (with a uniform elongation of 13.2 ± 0.2%), due to the combination of the enhanced dislocation plasticity, the higher back stress hardening, and the durable transformation-induced plasticity effect. Applying a thermo-kinetic theory of generalized stability, we further demonstrate that the increased strength and good plasticity in the Q&IP steel come from the phase transformations with high thermodynamic driving forces and high generalized stability.

Graphical abstract