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  1. No Access

    Article

    Relationships Between Stretch-Flangeability and Microstructure-Mechanical Properties in Ultra-High-Strength Dual-Phase Steels

    To clarify the direction of microstructure design for improving stretch-flangeability, relationships of stretch-flangeability to microstructure and mechanical properties of ultra-high-strength dual-phase (DP) ...

    Jae Ik Yoon, Jaimyun Jung, Hak Hyeon Lee, ** You Kim… in Metals and Materials International (2019)

  2. No Access

    Article

    Surface Abrasive Torsion for Improved Mechanical Properties and Microstructure

    A novel process of discrete surface abrasion during simple torsion (ST), named “surface abrasive torsion (SAT),” is proposed to overcome the limitation of ST, i.e., insufficient strain for severe plastic deformat...

    Ji Hyun Moon, Seung Mi Baek, Seok Gyu Lee… in Metallurgical and Materials Transactions A (2018)

  3. No Access

    Article

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

    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, an...

    Jae Ik Yoon, Jaimyun Jung, Hak Hyeon Lee, Hyoung Seop Kim in JOM (2018)

  4. No Access

    Article

    Deep drawing behavior of twinning-induced plasticity-cored three-layer steel sheet

    Herein, we report the results of our experimental and computational investigation of the deep drawing behavior of twinning-induced plasticity (TWIP)-cored three-layer steel sheet. Various directional tensile t...

    Seung Mi Baek, Jung Gi Kim, Jae Ik Yoon… in International Journal of Material Forming (2018)

  5. No Access

    Article

    Effect of target-fixture geometry on shock-wave compacted copper powders

    In shock compaction with a single gas gun system, a target fixture is used to safely recover a powder compact processed by shock-wave dynamic impact. However, no standard fixture geometry exists, and its effec...

    Wooyeol Kim, Dong-Hyun Ahn, Jae Ik Yoon, Lee Ju Park… in Metals and Materials International (2018)

  6. No Access

    Article

    Key factors of stretch-flangeability of sheet materials

    Stretch-flangeability evaluated using hole-expansion testing represents the ability of sheet materials to resist edge fracture during complex shape forming. Despite a property imperative for automotive part a...

    Jae Ik Yoon, Jaimyun Jung, Jung Gi Kim, Seok Su Sohn… in Journal of Materials Science (2017)

  7. No Access

    Article

    Residual Stress Effect on the Delayed Fracture of Twinning-Induced Plasticity Steels

    Residual stress effect of the deep drawn TWIP steel on delayed fracture was investigated. Microstructural features of the TWIP steels did not change after stress relief annealing, while the elastic lattice str...

    Jung Gi Kim, Jae Ik Yoon, Seung Mi Baek… in Metallurgical and Materials Transactions A (2017)

  8. Article

    Open Access

    Continuum understanding of twin formation near grain boundaries of FCC metals with low stacking fault energy

    Deformation twinning from grain boundaries is often observed in face-centered cubic metals with low stacking fault energy. One of the possible factors that contribute to twinning origination from grain boundar...

    Jaimyun Jung, Jae Ik Yoon, Jung Gi Kim, Marat I. Latypov… in npj Computational Materials (2017)

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  9. No Access

    Article

    Factors governing hole expansion ratio of steel sheets with smooth sheared edge

    Stretch-flangeability measured using hole expansion test (HET) represents the ability of a material to form into a complex shaped component. Despite its importance in automotive applications of advanced high s...

    Jae Ik Yoon, Jaimyun Jung, Hak Hyeon Lee… in Metals and Materials International (2016)