13th International Conference on Fracture June 16–21, 2013, Beijing, China Figure 6: L-S 3D view of reconstructed laminography data of a DP600 cut-edge at CMOD = 3 mm (260x350x700 µm3) Figure 7 shows L-S views of reconstructed laminography data of DP600 cut-edge. Figure 7a illustrates the cut-edge profile with the 4 characteristic zones. Microcracks, needle voids from the fracture zone surface and needle voids in the bulk can be seen in figure 7a. Figure 7b shows the coalescence sheet of needle voids growing from the fracture zone and the burnish zone. (b) (a) Figure 7: L-S 2D sections of reconstructed laminography data. (a) cut-edge profile at initial state. (b) Coalescence sheet at CMOD = 3 mm. 5. Conclusion The experimental study presented in this paper aims at gaining insight into the initial damage state and subsequent damage evolution during mechanical loading from DP600 steel grade cut-edges. 3D imaging using synchrotron radiation computed laminography has allowed us to identify different defects that a cut-edge at initial state contains. These include roughness in the fracture zone, needle voids in the bulk from fracture zone and alignment of needle voids along the flow lines i.e. martensite alignments. These results are consistent with the ones found in Ref. [1,3]. -7-
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