Influence of drawbead geometry and blank holder force on the dual phase steel formability

Oliveira, Alex Raimundo de; Lajarin, Sérgio Fernando; Rebeyca, Claudimir José; Filho, Ravilson Antonio Chemin; Nikhare, Chetan P.; Marcondes, Paulo Victor Prestes

doi:10.1007/s00170-022-09603-4

Cited by 3 publications

(1 citation statement)

References 22 publications

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“…However, shear cut edges of DP steel are prone to crack during the forming process. The premature fracture occurs below the prediction of forming limit curves (FLC), which is defined as low edge ductility [3,4].…”

Section: Introductionmentioning

confidence: 99%

Initiation and growth of edge cracks after shear cutting of dual-phase steel

Khalilabad

Perdahcioglu

Atzema

et al. 2023

Int J Adv Manuf Technol

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Dual-phase steels suffer from low edge ductility, which limits their formability. In this study, an in-plane bending test is used to investigate the initiation and evolution of edge cracks. The edges of samples were prepared by shear cutting and afterwards further deformed by the in-plane bending test. Void distribution and non-uniform plastic deformation were explored with the help of scanning electron microscope (SEM) and electron backscatter diffraction (EBSD) analysis and microhardness measurement in different regions of the material edge. The extent of micro-cracks was revealed by microcomputed tomography (µCT) scan. The result shows that the blanking process creates inhomogeneous void distribution in the thickness direction. As the deformation increases during the subsequent in-plane bending test, the micro-cracks initiate at the burr region and grow towards the rollover region. Once they entirely pass the thickness of the material, they grow further, away from the edge. High roughness, plastic deformation, and void volume fraction were observed at the burr region, triggering crack initiation. The in-plane bending test successfully distinguished the dominant mechanism behind edge cracking.

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Section: Introductionmentioning

confidence: 99%

Initiation and growth of edge cracks after shear cutting of dual-phase steel

Khalilabad

Perdahcioglu

Atzema

et al. 2023

Int J Adv Manuf Technol

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The experimental investigation of pre-bulging type on deep drawability

Kabakçi

Karaağaç

2023

J Braz. Soc. Mech. Sci. Eng.

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Analysis of the springback effect of laser welded DP600 high-strength steel thin sheets

Almeida,

Santos,

Panziera

et al. 2023

Journal of Laser Applications

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Steel sheets are produced with increasingly smaller thicknesses, without compromising the properties of the steel, maintaining ductility, strength, and energy absorption after impact can total depth enhance vehicle energy efficiency, lower manufacturing costs, and address the springback effect. The springback effect of laser-welded DP600 two-phase steel sheets was studied in this research. Parameters such as punching speed, initial bending angle, and time were varied. Tests including tensile tests, Vickers hardness, and optical microscopy analysis were conducted to correlate results with material properties. Autogenous laser welding joined DP600 steel plates at the bending position. Controlling springback ensures better quality in vehicle manufacturing and assembly. The results revealed that increasing the punch descent speed from 4 to 12 mm/min, for an internal angle of 90°, on the first day of observation, led to higher springback values (0.58°–3.3°, respectively), while increasing the initial curvature angle (30°–90°), maintaining a constant speed of 4 mm/min on the first day of observation, and impacting the elastic return (6.74°–0.58°, respectively). Furthermore, the observation time demonstrated a continuous increase in the springback variation during 6 days after the flexural test before stabilization (6.89°– 8.7°), maintaining a constant value of 8 mm/min and the internal angle of doubles of 30°.

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Influence of drawbead geometry and blank holder force on the dual phase steel formability

Cited by 3 publications

References 22 publications

Initiation and growth of edge cracks after shear cutting of dual-phase steel

Initiation and growth of edge cracks after shear cutting of dual-phase steel

The experimental investigation of pre-bulging type on deep drawability

Analysis of the springback effect of laser welded DP600 high-strength steel thin sheets

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