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<p>The microstructure and mechanical behavior of novel low-activation chromium-manganese austenitic steel in a&#xa0;cold-deformed state are investigated after annealing at 900 °C for 1, 10, and 100 h. It has been shown that at short annealing times (1 h), dispersed M<sub>23</sub>C<sub>6</sub> carbide particles (M—Cr, Mn, Fe) precipitate at grain and microtwin boundaries. Increasing the annealing time to 10 h leads to the onset of detwinning processes. After 100 h of annealing, significant reduction in the density of deformation-induced microtwins and dissolution of thin carbide plates occur. The carbide particles at the boundaries and within grains coagulate. A&#xa0;decrease in the density of deformation microtwins contributes to the corresponding decrease in the strength and an increase in the plastic properties of the steel after annealing. Despite a&#xa0;significant reduction of the yield and tensile strength after high-temperature annealing compared to the cold-deformed state, they have comparable or higher values than in the quenched state, which indicates high thermal stability of the steel microstructure.</p>

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Microstructure and mechanical properties of cold-deformed low-activation chromium-manganese austenitic steel after annealing at 900 °C

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • S. A. Akkuzin,
  • I. Yu. Litovchenko,
  • N. A. Polekhina,
  • K. V. Spiridonova,
  • V. V. Osipova,
  • A. V. Kim,
  • P. A. Pakholkina,
  • I. S. Timoshov,
  • V. M. Chernov

摘要

The microstructure and mechanical behavior of novel low-activation chromium-manganese austenitic steel in a cold-deformed state are investigated after annealing at 900 °C for 1, 10, and 100 h. It has been shown that at short annealing times (1 h), dispersed M23C6 carbide particles (M—Cr, Mn, Fe) precipitate at grain and microtwin boundaries. Increasing the annealing time to 10 h leads to the onset of detwinning processes. After 100 h of annealing, significant reduction in the density of deformation-induced microtwins and dissolution of thin carbide plates occur. The carbide particles at the boundaries and within grains coagulate. A decrease in the density of deformation microtwins contributes to the corresponding decrease in the strength and an increase in the plastic properties of the steel after annealing. Despite a significant reduction of the yield and tensile strength after high-temperature annealing compared to the cold-deformed state, they have comparable or higher values than in the quenched state, which indicates high thermal stability of the steel microstructure.