Transactions of Materials and Heat Treatment

Title：Adiabatic shear behavior and crack propagation mechanism on Ti6242 titanium alloy under high-speed impact loading

Authors： Peng Deping1 2 Liu Xiao1 2 He Dandan1 Wan Buyan1 Chen Yang3 Liu Wenhui1

Unit： 1.School of Mechanical Engineering Hunan University of Science and Technology 2.Xiangtan Huajin Heavy Equipment Co. Ltd. 3.Hunan Shengli Xianggang Steel Pipe Co. Ltd.

KeyWords： high-speed impact loading Ti6242 titanium alloy adiabatic shear band crack α/β phase

ClassificationCode：TG389

year,vol(issue):pagenumber：2022,47(9):224-229

Abstract：

In order to study the adiabatic shear behavior and crack propagation mechanism of Ti6242 titanium alloy under different impact loading, the impact test with average impact strain rate of 3069-11337 s-1 at room temperature was carried out by split Hopkinson Bar technique. Then, the adiabatic shear behavior in microstructure was analyzed by optical microscope, and the crack nucleation and propagation model was established. The results show that the impact strength of Ti6242 titanium alloy is not sensitive to average impact strain rate, and the plasticity displays an increasing trend with the increasing of the average impact strain rate. The number of adiabatic shear bands increases with the increasing of the average impact strain rate, and α/β phase in lamellar distribution hinders the propagation of adiabatic shear band, resulting in the bifurcation phenomenon of adiabatic shear bands. Under the high-speed impact loading, the pores nucleate, grow and merge in the adiabatic shear band, and finally form micro-cracks, which continue to expand by merging with the front-end holes to form macro-cracks, resulting in fracture failure of material.

Funds：

国家自然科学基金资助项目(51905166，52071139)；湖南省教育厅优秀青年基金项目（21B0471）

彭德平（1987-），男，博士研究生 E-mail：eden7321@163.com 通信作者：刘筱（1988-），女，博士，副教授，博士生导师 E-mail：liuxiao0105@163.com

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