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<p>This study investigates the impact of heterogeneous manganese distribution on austenite stability and mechanical properties in Fe-7.87Mn-1.60Si-4.04Al-0.08C steel. Heterogeneous Mn distribution was achieved by controlling intercritical annealing (IA) temperature. Results indicate that IA temperature modulates Mn partitioning, thereby influencing reverted austenite (γ<sub>rev</sub>) stability. γ<sub>rev</sub> with insufficient Mn content transforms into fresh martensite (FM) during quenching. The associated volumetric expansion induces strain fields that generate dislocations in adjacent retained austenite (RA). Consequently, increased dislocation density and FM content elevate tensile strength. Conversely, low-temperature IA enhances γ<sub>rev</sub> thermal stability through Mn-rich heterogeneity, retaining γ<sub>rev</sub> at room temperature to activate the transformation-induced plasticity effect. This significantly improves ductility with marginal strength reduction. Optimal mechanical properties were achieved at 740&#xa0;°C, yielding 38.8% total elongation and 911 MPa ultimate tensile strength.</p>

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Effect of Heterogeneous Distribution of Mn on Austenite Stability and Mechanical Properties of Cold-rolled Medium Manganese Steel

  • 期刊论文

  • 发表日期：

    2026年3月27日

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  • Can Peng,
  • Cainian Jing,
  • Tao Lin,
  • Yingming Tu,
  • Hengbin Liu,
  • Xinghui Li,
  • HaoDong Zhang

摘要

This study investigates the impact of heterogeneous manganese distribution on austenite stability and mechanical properties in Fe-7.87Mn-1.60Si-4.04Al-0.08C steel. Heterogeneous Mn distribution was achieved by controlling intercritical annealing (IA) temperature. Results indicate that IA temperature modulates Mn partitioning, thereby influencing reverted austenite (γrev) stability. γrev with insufficient Mn content transforms into fresh martensite (FM) during quenching. The associated volumetric expansion induces strain fields that generate dislocations in adjacent retained austenite (RA). Consequently, increased dislocation density and FM content elevate tensile strength. Conversely, low-temperature IA enhances γrev thermal stability through Mn-rich heterogeneity, retaining γrev at room temperature to activate the transformation-induced plasticity effect. This significantly improves ductility with marginal strength reduction. Optimal mechanical properties were achieved at 740 °C, yielding 38.8% total elongation and 911 MPa ultimate tensile strength.