Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5464626 | Surface and Coatings Technology | 2017 | 41 Pages |
Abstract
Laser shock peening is an innovative surface treatment, which has been shown to greatly improve the fatigue performance of Ti-17 alloy. This work investigates the impact toughness of Ti-17 treated by LSP with different laser energies. The results show that impact toughness increases by 2.1%, 11.7%, 64.1%, and 53.5% compared with a non-peened surface as the laser energy changes to 1, 3, 5, and 7Â J, respectively. Ti-17 exhibits a hardened layer after peening. A residual compressive stress of 382Â MPa is induced after four impacts with a laser of energy 5Â J. Fracture surface analysis and transmission electron micrographs are used to observe the microstructural changes. The micrographs establish a cleavage mechanism combined with the formation of a few dimples. The proliferation and tangling of dislocations in Ti-17 occurs and the dislocation density increases after LSP treatment. In addition, deformation twins are found after LSP treatment, which are helpful in improving the plasticity of the titanium alloy.
Related Topics
Physical Sciences and Engineering
Materials Science
Nanotechnology
Authors
Shuai Huang, Ying Zhu, Wei Guo, Peng Peng, Xungang Diao,