© 2013 Siemens Energy, Inc. All rights reserved. transverse direction show a different trend. Table 2. Side faces of post-test specimens at T0 and T0+250 0C Note that for all the fracture surfaces, no angles were found through the thickness direction, i.e., all fracture surfaces are totally perpendicular to the specimen surfaces, and no inclinations were found. Figure 8. Fracture surfaces in various KΔ regimes at T0 (a)-(c) TL type (d)-(f) LT type (a)-(c) D type A more detailed examination results on the fracture surfaces in various KΔ regimes are presented in Figure 8. At low KΔ regimes, all fracture surfaces are smooth and very fine fatigue striations were observed on the fracture surfaces, indicating a slow but steady cracking stage, as can be seen in Figure 8 (a), (d) and (e); however, at higher KΔ regime a more textured fracture morphology with cracks was observed, and there were lots of claw-like barriers lying on the path (see Figure 8 (b), (e)
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