13th International Conference on Fracture June 16-21, 2013, Beijing, China -3- 3. Results The un-tested material shows a great amount of LAGB, Figure 1c display the frequency distribution of LAGB and grain boundaries (GB). Revealing that LAGB of 2-3° is most common and that GB most commonly have angels around 30° and 60°. Figure 1b also reveals where the LAGB and GB are located; the most common LAGB is represented as red line and is randomly distributed in the microstructure. This resulted in two different LAGB intervals in this analysis to increase the detectability of LAGB changes. They are denoted as type I (2-6 °, red lines) and type II (6-12 °, green lines) LAGB respectively. Figure 1. Display a) SE-picture with red marked EBSD-analysis area, b) EBSD-map showing band slope and the distribution of LAGB and grain boundaries (GB) and c) the grain boundary legend shows the colour of corresponding angle [°] and the frequency distribution of LAGB and GB. Zero solution is marked white. In Figure 2 the LAGB distribution can be seen when a force corresponding to 200 MPa is applied. In Figure 2a graphite flakes have become larger due to internal cracking and matrix-graphite interface delamination, despite this the LAGB:s is unchanged. a) b c)
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