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<p>To study the hot deformation behavior and microstructure evolution of forged 42CrMoA steel, hot compression experiments of forged 42CrMoA steel under different deformation conditions (strain rate, temperature, strain) were carried out. A model that could accurately predict the stress change during hot deformation of forged 42CrMoA steel by strain was established. The stress–strain curves and the microstructure after rapid cooling were analyzed. The results show that the peak stress and softening characteristics of the stress–strain curves are related to the degree of dynamic recrystallization (DRX). When DRX is complete, the stress–strain curves have obvious peak stress and softening characteristics. The strain and degree of DRX have a significant effect on the microstructure distribution after rapid cooling. As the strain increases, the middle angle grain boundaries (MAGBs) fraction and average kernel average misorientation (KAM) local strain gradually increase. When the strain is greater than 0.69, the MAGBs fraction and average KAM local strain remain almost unchanged. Under the condition of determined strain, when DRX is complete, the MAGBs fraction and average KAM local strain of the microstructure after rapid cooling are relatively small.</p>

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Study on Hot Deformation Behavior and Microstructure Evolution of Forged 42CrMoA Steel

  • 期刊论文

  • 发表日期：

    2025年9月2日

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  • Xingwang Duan,
  • Yingqing Chen,
  • Xiucai Shi,
  • Shiguang Zhao,
  • Xin Che

摘要

To study the hot deformation behavior and microstructure evolution of forged 42CrMoA steel, hot compression experiments of forged 42CrMoA steel under different deformation conditions (strain rate, temperature, strain) were carried out. A model that could accurately predict the stress change during hot deformation of forged 42CrMoA steel by strain was established. The stress–strain curves and the microstructure after rapid cooling were analyzed. The results show that the peak stress and softening characteristics of the stress–strain curves are related to the degree of dynamic recrystallization (DRX). When DRX is complete, the stress–strain curves have obvious peak stress and softening characteristics. The strain and degree of DRX have a significant effect on the microstructure distribution after rapid cooling. As the strain increases, the middle angle grain boundaries (MAGBs) fraction and average kernel average misorientation (KAM) local strain gradually increase. When the strain is greater than 0.69, the MAGBs fraction and average KAM local strain remain almost unchanged. Under the condition of determined strain, when DRX is complete, the MAGBs fraction and average KAM local strain of the microstructure after rapid cooling are relatively small.