Abstract
In order to further investigate the ability and influencing factors of TA2 pure titanium to obtain strong trans -formation texture and the effect of deformation on phase transformation behavior, two different temperature control methods were specially designed for hot compression experiments. The results show that although the compression of beta-phase at high temperature does not significantly promote the transformation to alpha-phase, the concurrent deformation and transformation beta -> alpha by hot deformation with temperature-decreasing is realized and a special microstructure with ultrafine equiaxed grains is produced. The larger the strain in the phase transformation stage, the larger the fine grain region. All alpha grains derived from deformed beta, recrystallized beta and transformed beta accompanied by deformation can develop strong {11-20} texture. Deformation significantly promotes the formation of {11-20} transformation texture and deformation temperature is an important factor affecting the texture and grain size. A higher deformation temperature results in stronger variant selection, stronger texture and coarser grains. The area fraction of {11-20} transformation texture formed at 1150-990 degrees C reaches 77.4%. At low deformation temperature above the beta transus, nucleation and refinement of alpha phase are promoted, while the {11-20} texture are restrained. Reconstruction of the parent beta grains from EBSD data of alpha phase is helpful to further understand the texture evolution of pure titanium during hot deformation.