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Study on stretch bendability and shear fracture of 800 MPa dual phase steel sheet
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DOI：10.1016/j.matdes.2013.12.004.png)
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Abstract
En 中文
The stretch bendability and shear fracture of 800 MPa dual phase (DP) sheet steel under different punch radii has been experimentally studied in this paper. Its fracture mechanism has also been discussed with the help of scanning electron microscope (SEM) observation. The results show that the fracture mode of DP800 stretch bending experience a transition from shear fracture to necking before fracture with R/t ratios increasing. The SEM observation on the fractograph reveals that the rupture mode of DP800 is shear dimple pattern at tight punch radii, which can be attributed to the strain localization and void shearing behavior. From the examination of microstructure evolution near the fracture surface, it was found that the stress state plays a significant role in the failure mechanism of DP800. Moreover, the stamping robustness of ultrahigh strength DP steels was discussed and the fracture mechanism was investigated. (C) 2013 Elsevier Ltd. All rights reserved.
Keywords:
Dual phase steel sheet
Stretch-bendability
Scanning electron microscope
Shear fracture
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