Measurement of edge fracture strain of dual-phase steels by in-plane bending test

Khalilabad, Mahdi Masoumi; Perdahcıoğlu, Emin Semih; Atzema, E. H.; Boogaard, A.H. van den

doi:10.1088/1757-899x/1238/1/012039

Cited by 3 publications

(2 citation statements)

References 16 publications

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“…Several alternatives to the HEC test have been proposed in the literature, including the sheared edge tensile test [31,32], open hole tensile test [33], side bending test [34], and in-plane bending test [35]. Among these tests, the in-plane bending test is particularly advantageous since it allows for both global examination of edge performance via a momentcurvature diagram and local evaluation via digital image correlation.…”

Section: Punchmentioning

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: Punchmentioning

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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“…However, UHSS plates usually show an obvious sensitivity to edge cracks; thus, in order to solve the problem of material cracking, researchers have studied the plates cracking from multiple sides. Khalilabad et al [3,4] used a novel in-plane bending test to characterize the edge ductility of dual-phase steels and investigate the influence of material orientation, cutting parameters, and the global strain gradient on edge-fracture strain of DP800. Based on the modified Mohr-Coulomb fracture surface, Sandin et al [5] developed a numerical model for the shearing and cutting process of advanced high-strength steel blanks, which could predict the edge morphology in the shear-affected zone (SAZ).…”

Section: Introductionmentioning

confidence: 99%

Influence of Cutting Process on the Flanging Formability of the Cut Edge for DP980 Steel

Chang

Zhang

Han

et al. 2023

Metals

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Flanging is a key process in the forming of automobile parts and is influenced by the cutting process before it. In this paper, a set of self-designed tools is adopted. The flanging height and flanging radius are specified as the indexes to investigate the influence of the cutting process on the flanging formability of DP980 steel. Microstructure, microhardness, and tensile properties are tested to evaluate the formability of cut edges. The results show that the flanging formability is positively correlated with an increase in flanging height and a decrease in flanging radius. The flanging formability of six cut edges can be ranked as: LC-L > LC-H > WEDM-HS > WEDM-LS > CNC milling > WJC. In the LC process, acicular martensite is formed and the microhardness of the cut edge significantly increases, with a heat-affected zone of about 150 μm. More and larger microvoids are found on the edge of WEDM-LS than WEDM-HS, which reduces the formability to a certain extent. Plastic deformation of the edges is the reason for the decrease in the formability of CNC milling. For WJC, the formation of irregular edge damage and the generation of burrs are the main reasons for the unstable performance. This research is helpful in guiding the selection of the cutting process, and it may contribute to a high part formability for DP980 steel.

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