13th International Conference on Fracture June 16–21, 2013, Beijing, China -3- solution of OP-S (colloidal silica), and then etched with Nital 2%. For EBSD data collection was used software TSL 5 IOM Data collection and for data processing was used software OIM Analysis 5. The scanning electron microscope used for performing of such measures was the EDAX TSL EVO MA 10. Figure 2. Schematic representation of removed samples for performing EBSD. a) Cut plane of the perpendicular direction of fracture propagation, b) Cut plane in the parallel region to the direction of fracture propagation. 3. Results and Discussion 3.2 Charpy impact testing Fig. 3a) shows the curve of absorbed energy versus temperature for L-T and T-L orientations. It is possible to notice that there was a greater dispersion of energy values for the samples of L-T orientation when compared to the T-L orientation. At the lower upper shelf energy where the cleavage fracture occurs, both directions have obtained the same amount of energy, 5J. The L-T orientation has a higher upper shelf energy regarding T-L orientation, consequently this direction has higher absorbed energy for all temperatures. Concerning the ductile-brittle transition temperature, the L-T orientation has also obtained the highest absorbed energy values as a function of orientation, as can be seen in Fig. 3b). -200 -150 -100 -50 0 50 0 50 100 150 200 250 300 L-T T-L Energy (J) Temperature 癈 T-L L-T 80 100 120 140 160 180 200 220 240 260 280 Energy (J) Orientation 27癈 -5癈 -38癈 -49癈 Figure 3. Charpy impact testing a) as a function of temperature, b) as a function of the orientation (for some temperatures) b) a)
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