Annealing Heat Treatment Behavior in CP-Ti

The annealing heat treatment of commercial-purity titanium (CP-Ti) was investigated by scanning electron microcopy (SEM), electron backscatter diffraction (EBSD) technique and orientation distribution function (ODF). It is concluded that two stages can be depicted during the primary recrystallization. The first stage is completed at 500 degrees C in about 60 min, when about 25% of the material recrystallizes with an orientation change. The second stage is completed from 60 to 360 min, when a large part of the material (about 75% of the material) recrystallizes without any orientation change, suggesting in situ recrystallization. The changes in texture are more pronounced at the beginning of the grain growth process. Over long-term heat treatments, the texture evolves much more slowly. The wide peak area centered by {0 degrees, 30 degrees, 30 degrees} is enhanced, while the orientation near {0 degrees, 40 degrees, 50 degrees} is decreased.