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Processing and Properties of Medium-Mn TRIP Steel to Obtain a Two-Stage TRIP Behavior

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Abstract

Two medium-Mn steels of nominal composition 0.15C-2.0Si-10.5Mn-(0.75, 1.5) Al-0.04Nb-balFe (wt pct) were processed to produce sub-micron grain sizes of 0.65 and 0.80 μm. Mechanical testing was performed in three successive conditions: hot rolled, intercritically annealed, and cold rolled with subsequent intercritical annealing. Intercritical annealing was performed at 923 K for 20 hours. Electron-backscattered diffraction and X-ray diffraction were utilized to characterize the microstructure, consisting of α-ferrite, α-martensite, ε-martensite, and γ-austenite. Microstructural constituents were tracked during tensile deformation and it was found that both steels exhibited two-stage TRIP with γ-austenite martensitically transforming first to ε-martensite and as strain increased ε-martensite transformed to α-martensite.

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This work was supported by the Peaslee Steel Manufacturing Research Center (PSMRC). Companies directly involved in this work include AK Steel, ArcelorMittal, Nucor Steel, and US Steel. The FEI Helios NanoLab dual-beam FIB was obtained with a Major Research Instrumentation grant from the National Science Foundation under Contract DMR-0723128. The authors also acknowledge the support of the Materials Research Center and in particular Dr. Clarissa Wisner and Dr. Eric Bohannan for guidance and training in using the FIB and performing the XRD work.

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Authors and Affiliations

  1. US Army Combat Capabilities Development Command Army Research Laboratory, Aberdeen Proving Ground, 21005, USA

    D. M. Field

  2. AK Steel, Middletown, OH, 45005, USA

    L. G. Garza-Martinez

  3. Department of Materials Science and Engineering, Missouri University of Science and Technology, Rolla, MO, 65409, USA

    D. C. Van Aken

Authors
  1. D. M. Field
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  2. L. G. Garza-Martinez
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  3. D. C. Van Aken
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Correspondence to D. M. Field.

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Manuscript submitted January 28, 2020.

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Field, D.M., Garza-Martinez, L.G. & Van Aken, D.C. Processing and Properties of Medium-Mn TRIP Steel to Obtain a Two-Stage TRIP Behavior. Metall Mater Trans A 51, 4427–4433 (2020). https://doi.org/10.1007/s11661-020-05901-2

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