ICF13B

13th International Conference on Fracture June 16–21, 2013, Beijing, China -8- RD ND ND RD 1 2 3 4 5 6 7 Figure 8. Mapping of Taylor Factor. a) Scanned region, b) Histogram of number fractions Besides, in the Fig. 9 shows the mapping of Taylor factor from the sample region shown in Fig. 7b). In the Fig. 9 is possible to observe that approximately 55.34% of the grains have Taylor factor between 2.7 and 3.4. The stored energy in low carbon steels can be different conform to the sequence: E(110) > E(111) > E(211) > E(100) where hkl plans are related to rolling plans in each grain (12). Thus a comparison can be made from the 1, 2 and 3 numbered regions of the following Figs. 7b) and 9a), where is observed the presence of the (100) planes and Taylor factor value close to 2.7 in the respective regions, consequently, a smaller stored energy was absorbed. Whereas, the 4, 5 and 6 numbered regions of the same figures show a predominance of the (111) planes and Taylor factor value close to 4.5, but the number fraction of grains with this Taylor factor value is low (about 1.53). a) b)

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