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The automotive industry faces the challenge of enhancing fuel efficiency while meeting global environmental regulations on emissions. AdvancedHigh-strength steel high-strength steelsAdvanced high-strength steels (AHSS) have gained significant attention due to their superior strength and ductility compared to conventional steels. Among AHSS, medium-manganese steels, containing 3–12 wt.% Mn and classified as third-generation AHSS, are of great interest. This study explores the impact of alloying with molybdenum on the mechanical and microstructuralMicrostructural properties of medium-manganese steels, which rely heavily on the amount and stability of retained austeniteRetained austenite. Two medium-manganese steels with 0.05 and 0.25 wt.% molybdenum were investigated. MicrostructureMicrostructure development and element distribution were extensively analyzed using Energy Dispersive Spectroscopy (EDS) and Electron Backscattered Diffraction (EBSD) techniques. The results revealed a dual-phase microstructureMicrostructure of austenite and martensite, with Mn partitioning to austenite evident in all steels. Overall, molybdenum addition resulted in higher hardnessHardness.

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The Influence of Molybdenum Additions on the Mechanical and Microstructural Properties of Medium-Mn Steels

  • 会议论文

  • 发表日期：

    2025年

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  • Felisters Zvavamwe,
  • Jubert Pasco,
  • Kudakwashe Nyamuchiwa,
  • Gyanaranjan Mishra,
  • MinKyu Paek,
  • Clodualdo Aranas

摘要

The automotive industry faces the challenge of enhancing fuel efficiency while meeting global environmental regulations on emissions. AdvancedHigh-strength steel high-strength steelsAdvanced high-strength steels (AHSS) have gained significant attention due to their superior strength and ductility compared to conventional steels. Among AHSS, medium-manganese steels, containing 3–12 wt.% Mn and classified as third-generation AHSS, are of great interest. This study explores the impact of alloying with molybdenum on the mechanical and microstructuralMicrostructural properties of medium-manganese steels, which rely heavily on the amount and stability of retained austeniteRetained austenite. Two medium-manganese steels with 0.05 and 0.25 wt.% molybdenum were investigated. MicrostructureMicrostructure development and element distribution were extensively analyzed using Energy Dispersive Spectroscopy (EDS) and Electron Backscattered Diffraction (EBSD) techniques. The results revealed a dual-phase microstructureMicrostructure of austenite and martensite, with Mn partitioning to austenite evident in all steels. Overall, molybdenum addition resulted in higher hardnessHardness.