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

  • Dong-Woo Suh
  • Seong-Jun Park
  • Tae-Ho Lee
  • Chang-Seok Oh
  • Sung-Joon Kim
Article

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.

Keywords

Ferrite Austenite Martensite Austempering Trip Steel 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2009

Authors and Affiliations

  • Dong-Woo Suh
    • 1
  • Seong-Jun Park
    • 2
  • Tae-Ho Lee
    • 2
  • Chang-Seok Oh
    • 2
  • Sung-Joon Kim
    • 2
  1. 1.Graduate Institute of Ferrous Technology (GIFT)Pohang University of Science and Technology (POSTECH)PohangKorea
  2. 2.Structural Materials DivisionKorea Institute of Materials ScienceChangwonKorea

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