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<p>This study investigates the effect of annealing on the microstructure and mechanical properties of 310S heat-resistant steel after cold rolling. Samples with deformed were subjected to annealing at 1150&#xa0;°C for 3 h, and the resulting microstructural evolution and property changes were examined using optical microscopy, scanning electron microscopy, x-ray diffraction, tensile testing, and hardness testing. After annealing, the microstructure transformed into regular equiaxed grains with a high fraction of twin boundaries and large-angle grain boundaries, while slip bands disappeared. The annealed samples exhibited reduced hardness and strength but significantly enhanced ductility, both at room and elevated temperatures. X-ray diffraction confirmed the absence of new phases but indicated changes in grain orientation and residual stress. Overall, annealing effectively restored ductility and refined the grain structure, while reducing dislocation density and internal stress. These results provide insight into tailoring the balance between strength and plasticity in 310S heat-resistant steel through cold deformation and subsequent annealing, offering guidance for its application in high-temperature environments.</p>

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Effect of Recrystallization Annealing on Microstructure and Mechanical Properties of Cold-Rolled 310S Heat-Resistant Steel

  • 期刊论文

  • 发表日期：

    2026年2月24日

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  • Leideng Zhang,
  • Zhongyuan Zhao,
  • You Yang,
  • Yuxin Huang,
  • Xiaoke Liu,
  • Ran Song

摘要

This study investigates the effect of annealing on the microstructure and mechanical properties of 310S heat-resistant steel after cold rolling. Samples with deformed were subjected to annealing at 1150 °C for 3 h, and the resulting microstructural evolution and property changes were examined using optical microscopy, scanning electron microscopy, x-ray diffraction, tensile testing, and hardness testing. After annealing, the microstructure transformed into regular equiaxed grains with a high fraction of twin boundaries and large-angle grain boundaries, while slip bands disappeared. The annealed samples exhibited reduced hardness and strength but significantly enhanced ductility, both at room and elevated temperatures. X-ray diffraction confirmed the absence of new phases but indicated changes in grain orientation and residual stress. Overall, annealing effectively restored ductility and refined the grain structure, while reducing dislocation density and internal stress. These results provide insight into tailoring the balance between strength and plasticity in 310S heat-resistant steel through cold deformation and subsequent annealing, offering guidance for its application in high-temperature environments.