扭转变形对工业纯钛微观组织及拉伸力学性能的影响

2 pure titanium was subjected to stress relief annealing at 600 ℃ for half an hour, and the sample was twisted at different angles using a CNC torsion testing machine to study the evolution of its microstructure and mechanical properties under different amounts of torsional deformation. The results show that after torsion, the sample grains are refined, and the structure rotates in the axial direction. The morphology of the sample is distributed in a gradient, resulting in a gradient distribution of microhardness, which increases with the increase of the torsional deformation. The annealed pure titanium sample structure also has twin wafer layers, the yield strength increases with the increase of the torsion angle, and the plastic toughness is also significantly improved. Because of the proliferation of dislocations and the formation of twins, the overall mechanical properties are significantly improved.