Effect of phase interface on stretch-flangeability of metastable ferrous medium-entropy alloys

Choi, Yeon Taek; Asghari‐Rad, Peyman; Bae, Jae Wung; Kim, Hyoung Seop

doi:10.1016/j.msea.2022.143683

Cited by 4 publications

(1 citation statement)

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“…Gwon et al [11] showed that in the stretch flanging of TWIP steels, cracking occurs mainly at the grain boundaries between ferrite and martensite, and that grain refinement can improve stretch flangeability. Choi et al [12] stretch flanged three different types of steel sheets and showed that the alternation of FCC and BCC layers in the steel resulted in lower stretch flangeability due to voids at the phase interfaces. Wang et al [13] improved the stretch flangeability of TRIP steel by annealing the steel to generate a banded structure of soft ferrite phases, which caused cracks to propagate in the rolling direction.…”

Section: Introductionmentioning

confidence: 99%

Effect of shear angle in shearing on stretch flangeability of ultra-high strength steel sheets

Yagita

2023

Materials Research Proceedings

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Abstract. The effect of the shear angle in shearing on the stretch flangeability of 980 MPa ultra-high strength steel sheets was examined. The sheared edges of the ultra-high strength steel sheets sheared at different shear angles were investigated, and then the cracking on the sheared edge after stretch flanging was observed. The length of the fracture surface in the sheared edge was decreased by shearing with the punch with a shear angle, whereas many cracks and burrs at the edge of the fracture surface were caused, and the boundary between the burnished and fracture surfaces became rougher. In stretch flanging, the cracks in the fracture bottom side rapidly increased with the bending length. The stretch flangeability increased at a shear angle, where the number of cracks per unit length was the highest, i.e. this indicates that the large number of cracks in the sheared edge were effective in suppressing penetration cracking to fracture in the stretch flanging.

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Section: Introductionmentioning

confidence: 99%