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<p>This study proposes a processing strategy of pre-partitioning treatment for the production of Al-containing medium Mn steels (MMnSs). The pre-partitioning treatment hinges on the introduction of precursor microstructures composing of uniformly distributed lamellar Mn-depleted ferrite and Mn-enriched martensite via a pre-annealing process at a high intercritical temperature. When the precursor microstructures are used for subsequent annealing, the austenite reversion is confined to localized regions of thin martensite layers, facilitating rapid phase transformation due to short diffusion distance. This approach enables the creation of ultrafine duplex microstructures, consisting of lath-like intercritical ferrite and retained austenite, within a short annealing period. The MMnSs undergoing the pre-partitioning treatment show their excellent strength-elongation balance in tensile properties. The proposed pre-partitioning strategy is proven effective at pre-annealing temperatures ranging from 750 °C to 790 °C in the Al-containing MMnS, suggesting a wide processing window. The present study highlights the potential of pre-partitioning strategy for producing the MMnSs with outstanding mechanical properties in shortened processing periods.</p>

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Improving Strength and Ductility of Al-Containing Medium Mn Steels by Introducing Pre-partitioning Treatment in Intercritical Annealing

  • 期刊论文

  • 发表日期：

    2025年8月2日

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  • Hailong Zhu,
  • Chengwu Zheng,
  • Baojia Hu,
  • Yi Lu,
  • Peng Liu,
  • Sheng Cheng,
  • Tian Liang,
  • Yikun Luan,
  • Dianzhong Li

摘要

This study proposes a processing strategy of pre-partitioning treatment for the production of Al-containing medium Mn steels (MMnSs). The pre-partitioning treatment hinges on the introduction of precursor microstructures composing of uniformly distributed lamellar Mn-depleted ferrite and Mn-enriched martensite via a pre-annealing process at a high intercritical temperature. When the precursor microstructures are used for subsequent annealing, the austenite reversion is confined to localized regions of thin martensite layers, facilitating rapid phase transformation due to short diffusion distance. This approach enables the creation of ultrafine duplex microstructures, consisting of lath-like intercritical ferrite and retained austenite, within a short annealing period. The MMnSs undergoing the pre-partitioning treatment show their excellent strength-elongation balance in tensile properties. The proposed pre-partitioning strategy is proven effective at pre-annealing temperatures ranging from 750 °C to 790 °C in the Al-containing MMnS, suggesting a wide processing window. The present study highlights the potential of pre-partitioning strategy for producing the MMnSs with outstanding mechanical properties in shortened processing periods.