Parent beta grain reconstruction of globularized Ti-6Al-4V alloy

In this study, a denoising method of smoothing spline is proposed to reconstruct parent beta grain of titanium alloys as a supplement to the past literatures. The beta mean orientation of the sample with bimodal microstructure can be well reconstructed with similar grain size and negligible misorientation (<1 degrees) compared with traditional reconstruction result. The second test case deals with globularized alpha grains after multi-axial hot compression. Obvious beta recrystallization happens inside the large prior beta grain during deformation, which can facilitate the homogeneous globularization process. The mean orientation reconstruction of recrystallized beta grain by smoothing spline is performed and further compared with the orientation calculated from one alpha colony by orientation-trace method. The maximum 20 degrees misorientation exists due to the local orientation deviation inside both alpha and beta grains during globularization processing. In addition, the globularization mechanism under multi-axial hot compression is analyzed. Despite the appearance of local heterogeneity between different alpha colonies, high globularized efficiency around 71.2% can be easily achieved by the multi-directional deformation. (C) 2021 Published by Elsevier Ltd.