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Observations on the Nonlinear Unloading Behavior of Advanced High Strength Steels

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Abstract

The unloading behavior was compared for three different steel grades: a dual-phase steel, a transformation-induced plasticity steel, and a twinning-induced plasticity steel. Steels that harden by phase transformation or deformation twinning exhibited a smaller component of microplastic strain during unloading and a smaller reduction in the chord modulus compared to the conventional hardening steel. As a result, unloading is closer to pure elastic unloading when the TRIP effect or TWIP effect is active.

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The authors would like to acknowledge POSCO for supplying the steel used in this investigation. M.-G. Lee appreciates support by the National Research Foundation of Korea (NRF) Grant funded by the Korea government (MSIP) (No. 2012R1A5A1048294) and industrial source technology development program (#10040078) of MKE.

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Authors and Affiliations

  1. Institute for Frontier Materials, Deakin University, 75 Pigdons Road, Waurn Ponds, VIC, 3216, Australia

    Erik J. Pavlina (Research Fellow)

  2. Department of Materials Science and Engineering, Korea University, Anam-dong, Seongbuk-gu, Seoul, 136-701, Korea

    Myoung-Gyu Lee (Associate Professor)

  3. Graduate Institute for Ferrous Technology, Pohang University of Science and Technology, Pohang, Gyeongbuk, 790-784, South Korea

    Frédéric Barlat (Professor and Director of Materials Mechanics Laboratory)

Authors
  1. Erik J. Pavlina
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  2. Myoung-Gyu Lee
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  3. Frédéric Barlat
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Correspondence to Myoung-Gyu Lee.

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Manuscript submitted August 26, 2014.

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Pavlina, E.J., Lee, MG. & Barlat, F. Observations on the Nonlinear Unloading Behavior of Advanced High Strength Steels. Metall Mater Trans A 46, 18–22 (2015). https://doi.org/10.1007/s11661-014-2688-0

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