13th International Conference on Fracture June 16–21, 2013, Beijing, China -7- 5. Conclusions The orientation maps close to the delamination region have displayed a heterogeneous grain size distribution. The Taylor factor values were the lower absorbed energy with <100> type orientation. While the <111> type orientation has shown higher absorbed energy, consequently, a higher Taylor factor value. The orientation distribution function and pole figure have shown the presence of the α fiber texture such as :{113}<110>, {112}<110> e {223}<110>, these components produce anisotropic mechanical properties that during fracture process act to reduce the plastic constraint and contributing to increase the stress plane. The {100}<110> cube fiber component has been found in the delamination region, it is main responsible to the occurrence of phenomenon in HSLA. Acknowledgements The authors thank the USIMINAS by providing the material under study, the UFF-Federal Fluminense University, for performing the EBSD measurements, and CAPES for providing scholarship and the project (Case No. PNPD-23038.008242/2010-08) {111}<110> (γ fiber) {100}<011> (α fiber) {112}<110> (α fiber) {113}<110> (αfiber) Φ a) b) Figure 6. a) Pole figures from the (111), (110) and (100) centered planes obtained in the delamination region. b) orientation function o distribution for the section φ2 = 45°.
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