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<p>This study systematically explores the microstructural evolution and mechanical performance of Fe–Cr–Mo–Mn alloy subjected to isothermal quenching (IQ), isothermal quenching + tempering (IQT), and conventional quenching + tempering (QT) heat treatment processes. Compared with the tempered sorbite microstructure produced by conventional QT, IQ-250 consists of a mixture of martensite and lower bainite, achieving ultra-high tensile strength (~ 1861.8&#xa0;MPa) but exhibiting limited ductility and poor low-temperature impact toughness. Compared with the tempered sorbite microstructure produced by conventional QT, IQ-250 consists of a mixture of martensite and lower bainite, achieving ultra-high tensile strength (~ 1861.8&#xa0;MPa) but exhibiting limited ductility and poor low-temperature impact toughness. In contrast, the IQT-250 process, derived from IQ treatment, effectively preserves the deformation sub-structure, and produces a refined tempered sorbite microstructure with finer grains and higher dislocation density. In addition, unlike the coarse, grain-boundary-enriched carbides in QT specimens, IQT-250 produces fine, equiaxed, and uniformly dispersed M₃C carbides, which effectively impede dislocation motion, reduce grain-boundary stress concentrations. The IQT-250 treatment markedly enhances mechanical performance, achieving 913.7&#xa0;MPa UTS, 23.2% elongation, and 141.6&#xa0;J/cm<sup>2</sup> impact toughness, demonstrating superior strength–ductility–toughness synergy compared with conventional QT.</p>

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Microstructural evolution and mechanical properties of Fe–Cr–Mo–Mn alloy under IQ and IQT heat treatments

  • 期刊论文

  • 发表日期：

    2025年9月26日

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  • Depeng Shen,
  • Cunchao Dou,
  • Guoqiang Liu,
  • Ning Guo,
  • Fu Guo,
  • Tianjiao Huang,
  • Bingtao Tang

摘要

This study systematically explores the microstructural evolution and mechanical performance of Fe–Cr–Mo–Mn alloy subjected to isothermal quenching (IQ), isothermal quenching + tempering (IQT), and conventional quenching + tempering (QT) heat treatment processes. Compared with the tempered sorbite microstructure produced by conventional QT, IQ-250 consists of a mixture of martensite and lower bainite, achieving ultra-high tensile strength (~ 1861.8 MPa) but exhibiting limited ductility and poor low-temperature impact toughness. Compared with the tempered sorbite microstructure produced by conventional QT, IQ-250 consists of a mixture of martensite and lower bainite, achieving ultra-high tensile strength (~ 1861.8 MPa) but exhibiting limited ductility and poor low-temperature impact toughness. In contrast, the IQT-250 process, derived from IQ treatment, effectively preserves the deformation sub-structure, and produces a refined tempered sorbite microstructure with finer grains and higher dislocation density. In addition, unlike the coarse, grain-boundary-enriched carbides in QT specimens, IQT-250 produces fine, equiaxed, and uniformly dispersed M₃C carbides, which effectively impede dislocation motion, reduce grain-boundary stress concentrations. The IQT-250 treatment markedly enhances mechanical performance, achieving 913.7 MPa UTS, 23.2% elongation, and 141.6 J/cm2 impact toughness, demonstrating superior strength–ductility–toughness synergy compared with conventional QT.