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This study investigated the influence of hot rolling with and without reheating, followed by annealing at different temperaturesTemperature, on the microstructural evolution and stability of high-Mn steelsSteel. Two alloys with 0.14–0.40% C and 15–18% Mn were manufactured by induction melting from commercial AISI 1018 steelSteel and subjected to hot rolling with final reductionsReduction of above 80%. Post-deformation, annealing heat treatmentsHeat treatment were conducted at 700, 900, and 1000 °C, and the resulting microstructuresMicrostructure were analyzed using conventional metallography. The results highlight the decisive role of chemical composition: the higher-C alloy promoted the coexistence of twinningTwinning-induced plasticity (TWIP) and transformation-induced plasticity (TRIP) mechanisms, whereas the low-C/high-Mn alloy exhibited enhanced austenitic stability with effective suppression of martensiteMartensite formation. The hot-rolling route also had a significant impact: samples processed with intermediate reheating developed finer and more homogeneous microstructuresMicrostructure, in contrast to single-pass rolled samples, which retained deformation twins and showed microstructural heterogeneity. Annealing treatments further revealed that increasing the temperatureTemperature promoted recrystallizationRecrystallization and grain growth, with 1000 °C leading to the most homogeneous austenitic microstructureMicrostructure. These findings demonstrate that both the chemical composition and thermomechanical processing strongly influence the balance between the TWIP and TRIP mechanisms, as well as the final grain structure. The combination of reheating during rolling and subsequent annealing at elevated temperaturesTemperature produced the most favorable microstructural conditions, which is expected to optimize the mechanical performance by enhancing the trade-off between strengthStrength and ductility.

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Microstructural Optimization in High-Manganese Steels by Controlling Hot Rolling and Heat Treatment Conditions

  • 会议论文

  • 发表日期：

    2026年

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  • Víctor Ronaldo Gaytán-Calderón,
  • Nancy Margarita López-Granados,
  • Constantin Alberto Hernández-Bocanegra,
  • José Ángel Ramos-Banderas,
  • Nicolás David Herrera-Sandoval

摘要

This study investigated the influence of hot rolling with and without reheating, followed by annealing at different temperaturesTemperature, on the microstructural evolution and stability of high-Mn steelsSteel. Two alloys with 0.14–0.40% C and 15–18% Mn were manufactured by induction melting from commercial AISI 1018 steelSteel and subjected to hot rolling with final reductionsReduction of above 80%. Post-deformation, annealing heat treatmentsHeat treatment were conducted at 700, 900, and 1000 °C, and the resulting microstructuresMicrostructure were analyzed using conventional metallography. The results highlight the decisive role of chemical composition: the higher-C alloy promoted the coexistence of twinningTwinning-induced plasticity (TWIP) and transformation-induced plasticity (TRIP) mechanisms, whereas the low-C/high-Mn alloy exhibited enhanced austenitic stability with effective suppression of martensiteMartensite formation. The hot-rolling route also had a significant impact: samples processed with intermediate reheating developed finer and more homogeneous microstructuresMicrostructure, in contrast to single-pass rolled samples, which retained deformation twins and showed microstructural heterogeneity. Annealing treatments further revealed that increasing the temperatureTemperature promoted recrystallizationRecrystallization and grain growth, with 1000 °C leading to the most homogeneous austenitic microstructureMicrostructure. These findings demonstrate that both the chemical composition and thermomechanical processing strongly influence the balance between the TWIP and TRIP mechanisms, as well as the final grain structure. The combination of reheating during rolling and subsequent annealing at elevated temperaturesTemperature produced the most favorable microstructural conditions, which is expected to optimize the mechanical performance by enhancing the trade-off between strengthStrength and ductility.