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

Jae Ik Yoon; Jaimyun Jung; Hak Hyeon Lee; Jin You Kim; Hyoung Seop Kim

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자료유형: 학술저널

저자정보: Jae Ik Yoon (Pohang University of Science and Technology (POSTECH)) Jaimyun Jung (Pohang University of Science and Technology (POSTECH)) Hak Hyeon Lee (Pohang University of Science and Technology (POSTECH)) Jin You Kim (POSCO) Hyoung Seop Kim (Pohang University of Science and Technology (POSTECH))

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.25 No.5

발행연도: 2019.1

수록면: 1,161 - 1,169 (9page)

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To clarify the direction of microstructure design for improving stretch-flangeability, relationships of stretch-flangeability tomicrostructure and mechanical properties of ultra-high-strength dual-phase (DP) steels were investigated. Microstructureof relatively simple ferrite-martensite DP steels was modified by intercritical annealing, then the effects of microstructuremodification on stretch-flangeability, tensile properties, and fracture resistance of the DP steels were systematically quantified. The hole-expansion ratio (HER) increased linearly with an increase the apparent fracture initiation energy, but was notsignificantly correlated with any individual microstructural properties of DP steels, which have been reported to correlatewith HER (e.g., the fraction of martensite, the carbon content of martensite, or the hardness difference between ferrite andmartensite). To increase the stretch-flangeability of an ultra-high-strength DP steels, its microstructure should be designedto increase its fracture toughness (i.e., microstructure with low mechanical heterogeneity).

#Martensite fraction · Formability · Hole-expansion test · Apparent fracture toughness · Tensile properties

참고문헌 (48)

참고문헌 신청

M. Wendler / 2017 / Acta Mater 133:346

G. Gao / 2017 / Mater. Sci. Eng., A 702:104

W. W. Sun / 2018 / Scripta Mater 146:60

S. Liu / 2017 / Acta Mater 124:159

A. G. Kalashami / 2016 / Mater. Sci. Eng., A 658:355

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