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Back-Stress Effect on the Mechanical Strength of TWIP-IF Steels Layered Sheet

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Abstract

Although back-stress contributes to the mechanical properties of materials, the degree of strength enhancement from back-stress is not easy to estimate. In this research, back-stress hardening of twinning-induced plasticity (TWIP) + interstitial free (IF)-layered steel sheets were estimated by implementing a non-linear combined isotropic and kinematic hardening model. High back-stress evolution occurs due to plastic strain incompatibility between a TWIP-steel core and IF-steel sheath, and the strength of TWIP + IF layered steel sheath is greater than the strength estimated by the rule-of-mixtures. A non-linear combined isotropic and kinematic hardening model was used to estimate the strength enhancement from back-stress hardening, and the simulation results were correlated with the experimental results. This result shows that the back-stress evolution in heterogeneous materials contributes to their strength, and that the non-linear combined isotropic and kinematic hardening should be included to estimate the degree of back-stress hardening.

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Acknowledgements

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Ministry of Science, ICT and Future Planning (MSIP) of Korea (NRF-2017R1A2A1A17069427). Also, this study was supported by the Brain Korea 21 PLUS project for Center for Creative Industrial Materials (F16SN25D1706).

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Author notes

  1. Jung Gi Kim and Min Ji Jang have contributed equally to this work.

Authors and Affiliations

  1. Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea

    Jung Gi Kim, Min Ji Jang, Hyung Keun Park, Sunghak Lee & Hyoung Seop Kim

  2. Graduate Institute of Ferrous Technology, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea

    Kwang-Geun Chin & Hyoung Seop Kim

  3. Center for High Entropy Alloys, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea

    Hyoung Seop Kim

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  1. Jung Gi Kim
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  2. Min Ji Jang
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  3. Hyung Keun Park
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  4. Kwang-Geun Chin
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Correspondence to Hyoung Seop Kim.

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Kim, J.G., Jang, M.J., Park, H.K. et al. Back-Stress Effect on the Mechanical Strength of TWIP-IF Steels Layered Sheet. Met. Mater. Int. 25, 912–917 (2019). https://doi.org/10.1007/s12540-019-00258-7

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