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Small-Scale System for Evaluation of Stretch-Flangeability with Excellent Reliability

  • Shaping & Forming of Advanced High Strength Steels
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Abstract

We propose a system for evaluating the stretch-flangeability of small-scale specimens based on the hole-expansion ratio (HER). The system has no size effect and shows excellent reproducibility, reliability, and economic efficiency. To verify the reliability and reproducibility of the proposed hole-expansion testing (HET) method, the deformation behavior of the conventional standard stretch-flangeability evaluation method was compared with the proposed method using finite-element method simulations. The distribution of shearing defects in the hole-edge region of the specimen, which has a significant influence on the HER, was investigated using scanning electron microscopy. The stretch-flangeability of several kinds of advanced high-strength steel determined using the conventional standard method was compared with that using the proposed small-scale HET method. It was verified that the deformation behavior, morphology and distribution of shearing defects, and stretch-flangeability results for the specimens were the same for the conventional standard method and the proposed small-scale stretch-flangeability evaluation system.

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Acknowledgements

This work was supported by a National Research Foundation of Korea (NRF) Grant funded by the Korea government (MSIP) (No. 2014R1A2A1A10051322). This study was supported by the Brain Korea 21 PLUS Project for the Center for Creative Industrial Materials (F16SN25D1706).

Conflict of interest

The authors declare that they have no conflict of interest.

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Authors and Affiliations

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

    Jae Ik Yoon, Jaimyun Jung, Hak Hyeon Lee & Hyoung Seop Kim

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

    Hyoung Seop Kim

Authors
  1. Jae Ik Yoon
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  2. Jaimyun Jung
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  3. Hak Hyeon Lee
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  4. Hyoung Seop Kim
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Correspondence to Hyoung Seop Kim.

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Yoon, J.I., Jung, J., Lee, H.H. et al. Small-Scale System for Evaluation of Stretch-Flangeability with Excellent Reliability. JOM 70, 912–917 (2018). https://doi.org/10.1007/s11837-018-2766-7

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  • DOI: https://doi.org/10.1007/s11837-018-2766-7

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