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Influence of Al on the Microstructural Evolution and Mechanical Behavior of Low-Carbon, Manganese Transformation-Induced-Plasticity Steel

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Abstract

Microstructural design with an Al addition is suggested for low-carbon, manganese transformation-induced-plasticity (Mn TRIP) steel for application in the continuous-annealing process. With an Al content of 1 mass pct, the competition between the recrystallization of the cold-rolled microstructure and the austenite formation cannot be avoided during intercritical annealing, and the recrystallization of the deformed matrix does not proceed effectively. The addition of 3 mass pct Al, however, allows nearly complete recrystallization of the deformed microstructure by providing a dual-phase cold-rolled structure consisting of ferrite and martensite and by suppressing excessive austenite formation at a higher annealing temperature. An optimized annealing condition results in the room-temperature stability of the intercritical austenite in Mn TRIP steel containing 3 mass pct Al, permitting persistent transformation to martensite during tensile deformation. The alloy presents an excellent strength-ductility balance combining a tensile strength of approximately 1 GPa with a total elongation over 25 pct, which is comparable to that of Mn TRIP steel subjected to batch-type annealing.

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Authors and Affiliations

  1. Graduate Institute of Ferrous Technology (GIFT), Pohang University of Science and Technology (POSTECH), Pohang, 790-784, Korea

    Dong-Woo Suh (Associate Research Professor)

  2. Structural Materials Division, Korea Institute of Materials Science, Changwon, Kyungnam, 641-010, Korea

    Seong-Jun Park (Senior Researcher), Tae-Ho Lee (Senior Researcher), Chang-Seok Oh (Principal Researcher) & Sung-Joon Kim (Principal Researcher)

Authors
  1. Dong-Woo Suh
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  2. Seong-Jun Park
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  3. Tae-Ho Lee
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  4. Chang-Seok Oh
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  5. Sung-Joon Kim
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Correspondence to Dong-Woo Suh.

Additional information

Manuscript submitted April 3, 2009.

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Suh, DW., Park, SJ., Lee, TH. et al. Influence of Al on the Microstructural Evolution and Mechanical Behavior of Low-Carbon, Manganese Transformation-Induced-Plasticity Steel. Metall Mater Trans A 41, 397–408 (2010). https://doi.org/10.1007/s11661-009-0124-7

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  • DOI: https://doi.org/10.1007/s11661-009-0124-7

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