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<p>A medium-Mn steel with a Mn content as low as 3.85 wt% and a low carbon content of 0.1 wt% was designated via alloying with a small amount of Al and Cu. The steel was subjected to hot-rolling followed by intercritical annealing at 720°C, 760°C, and 800°C to produce transformation-induced plasticity (TRIP) steels. The sample annealed at 720°C showed a retained austenite (RA) volume fraction of 16.5% (TRIP steel), while no RA was found in those annealed at 760°C and 800°C. The sample annealed at 720°C exhibited the most favorable combination of tensile properties, resulting in a remarkable product of ultimate tensile strength and uniform elongation (UTS × UE) value exceeding 25,000&#xa0;MPa%, which is competitive with medium-Mn TRIP steels with higher Mn contents. Evolution of the work-hardening behavior, using the Hollomon analysis, revealed the superior extension of the second stage of work-hardening region in the 720°C-annealed sample, which is a clear manifestation of its broader TRIP effect domain relative to other specimens.</p>

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Development of a Low-Carbon Medium-Mn TRIP Steel with an Excellent Combination of Strength and Ductility

  • 期刊论文

  • 发表日期：

    2026年3月24日

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  • H. Ashrafi,
  • M. Karimi,
  • N. Saeidi

摘要

A medium-Mn steel with a Mn content as low as 3.85 wt% and a low carbon content of 0.1 wt% was designated via alloying with a small amount of Al and Cu. The steel was subjected to hot-rolling followed by intercritical annealing at 720°C, 760°C, and 800°C to produce transformation-induced plasticity (TRIP) steels. The sample annealed at 720°C showed a retained austenite (RA) volume fraction of 16.5% (TRIP steel), while no RA was found in those annealed at 760°C and 800°C. The sample annealed at 720°C exhibited the most favorable combination of tensile properties, resulting in a remarkable product of ultimate tensile strength and uniform elongation (UTS × UE) value exceeding 25,000 MPa%, which is competitive with medium-Mn TRIP steels with higher Mn contents. Evolution of the work-hardening behavior, using the Hollomon analysis, revealed the superior extension of the second stage of work-hardening region in the 720°C-annealed sample, which is a clear manifestation of its broader TRIP effect domain relative to other specimens.