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<p>This study investigated the effects of inter-pass reheating (350–550&#xa0;°C, 5–60 min) on the microstructure and mechanical properties (hardness, tensile strength, yield strength, elongation) of AZ31 magnesium alloy rolled sheets via orthogonal experiments, with a dual-index system (average grain size, grain size dispersion) for microstructure quantification. A cellular automaton (CA) model was established to simulate optimal microstructural evolution. The key process window was clarified: 400&#xa0;°C is the critical temperature, with 10 min holding yielding fine equiaxed grains and high strength, and 60 min holding improving plasticity via better microstructure uniformity without obvious strength loss. At 400°C, grain size and its dispersion both first decrease and then increase with reheating time.</p>

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Inter-pass Reheating During Rolling of Magnesium Alloy Sheets for Enhanced Mechanical Properties and Numerical Simulation of Grain Evolution Process Based on Cellular Automaton

  • 期刊论文

  • 发表日期：

    2026年6月25日

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  • Weitao Jia,
  • Hang Lv,
  • Xinyan Liu,
  • Fangkun Ning,
  • Yonghui Jia

摘要

This study investigated the effects of inter-pass reheating (350–550 °C, 5–60 min) on the microstructure and mechanical properties (hardness, tensile strength, yield strength, elongation) of AZ31 magnesium alloy rolled sheets via orthogonal experiments, with a dual-index system (average grain size, grain size dispersion) for microstructure quantification. A cellular automaton (CA) model was established to simulate optimal microstructural evolution. The key process window was clarified: 400 °C is the critical temperature, with 10 min holding yielding fine equiaxed grains and high strength, and 60 min holding improving plasticity via better microstructure uniformity without obvious strength loss. At 400°C, grain size and its dispersion both first decrease and then increase with reheating time.