Effects of recrystallized structures on adiabatic shear behaviors of TA2 pure titanium

HU Li; LIU Longfei; WANG Xu; YANG Zhicheng; WU Zhiqiang

doi:10.11883/bzycj-2021-0529

Volume 43 Issue 1

Jan. 2023

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HU Li, LIU Longfei, WANG Xu, YANG Zhicheng, WU Zhiqiang. Effects of recrystallized structures on adiabatic shear behaviors of TA2 pure titanium[J]. Explosion And Shock Waves, 2023, 43(1): 013104. doi: 10.11883/bzycj-2021-0529

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Effects of recrystallized structures on adiabatic shear behaviors of TA2 pure titanium

doi: 10.11883/bzycj-2021-0529

School of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China

Received Date: 2021-12-27
Rev Recd Date: 2022-05-15

Available Online: 2022-06-06

Publish Date: 2023-01-05

Abstract

Abstract

Adiabatic shear is a common form of deformation and failure of materials under high-speed impact loading. It generally exists in high-speed deformation processes such as high-speed impact, stamping forming, projectile penetration, high-speed cutting, and explosive crushing. A TA2 pure titanium plate with a total deformation of 70% was obtained by multi-pass large strain cold rolling on a two-high mill. By heating cold rolled TA2 pure titanium plates at 500 ℃ and annealing at varying holding times, titanium plates with different recrystallization structures were produced. Based on a hat-shaped specimen and a limit-ring deformation control approach, dynamic impact freezing experiments were carried out on the specimens with different recrystallized structures by using a split Hopkinson pressure bar. The microstructure changes of the specimens before and after impact were characterized by using an optical microscope and a scanning electron microscope. The effects of recrystallized structures on adiabatic shear behaviors of TA2 pure titanium were studied, showing that with the increase of annealing holding time, the proportion of recrystallized grains increases gradually, and the grain distribution changes from dispersion to local aggregation. Under the same strain and strain rate, adiabatic shear bands were observed in all specimens. The specimens with high proportion of recrystallized grains are more likely to induce crack nucleation and propagation in adiabatic shear bands. The changes of recrystallization structures and geometric necessary dislocations before and after deformation were compared. Combined with the analysis of the overall temperature rise in the shear area, the recrystallized grain as the material softening zone can induce the formation of shear band. The adiabatic temperature rise effect mainly occurs in the later stage of the development of shear band, which promotes the secondary recrystallization of materials in the shear band, improves the toughness of materials in the shear band and delays the formation of shear cracks.
- TA2 pure titanium,
- recrystallization,
- hat-shaped specimen,
- adiabatic shear

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References

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