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<p>In this study, pulsed neutron Bragg-edge transmission (BET) imaging was employed to characterize plastic deformation of high-manganese (Mn) austenitic steel during cryogenic impact fracture. Electron backscatter diffraction (EBSD) was used to examine the microstructural evolution. The results reveal that the Bragg-edge width of the (200) lattice plane, <i>σ</i><sub><i>200</i></sub> = 100&#xa0;µs, was identified as the critical value for large plastic deformation. Accordingly, the characteristic regions were classified by <i>σ</i><sub><i>200</i></sub> value. Regions with <i>σ</i><sub><i>200</i></sub> &gt; 100&#xa0;µs correspond to crack initiation and stable crack growth, while those with <i>σ</i><sub><i>200</i></sub> &lt; 100&#xa0;µs correspond to unstable crack growth. Both crack initiation and stable crack growth regions exhibited higher levels of plastic deformation, twin density, and dislocation density compared to unstable crack growth regions. Moreover, <i>σ</i><sub><i>200</i></sub> showed strong positive correlations with the dislocation density, twin density and hardness. As the test temperature decreased from 273 to 77&#xa0;K, the transition point from stable to unstable crack growth occurred earlier. This is responsible for the reduction in impact absorbed energy. These findings provide new insights into the cryogenic toughening mechanism of high-Mn austenitic steel.</p>

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Plastic deformation and microstructural evolution during cryogenic charpy impact of high-Mn austenitic steel

  • 期刊论文

  • 发表日期：

    2026年2月26日

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  • Li Jiang,
  • Honghong Wang,
  • Yuhua Su,
  • Pingguang Xu,
  • Takenao Shinohara,
  • Bin Xia,
  • Yangwen Wang

摘要

In this study, pulsed neutron Bragg-edge transmission (BET) imaging was employed to characterize plastic deformation of high-manganese (Mn) austenitic steel during cryogenic impact fracture. Electron backscatter diffraction (EBSD) was used to examine the microstructural evolution. The results reveal that the Bragg-edge width of the (200) lattice plane, σ200 = 100 µs, was identified as the critical value for large plastic deformation. Accordingly, the characteristic regions were classified by σ200 value. Regions with σ200 > 100 µs correspond to crack initiation and stable crack growth, while those with σ200 < 100 µs correspond to unstable crack growth. Both crack initiation and stable crack growth regions exhibited higher levels of plastic deformation, twin density, and dislocation density compared to unstable crack growth regions. Moreover, σ200 showed strong positive correlations with the dislocation density, twin density and hardness. As the test temperature decreased from 273 to 77 K, the transition point from stable to unstable crack growth occurred earlier. This is responsible for the reduction in impact absorbed energy. These findings provide new insights into the cryogenic toughening mechanism of high-Mn austenitic steel.