Laser Shock Peening for Improving Fatigue Property of Additively Manufactured Metals
YI Min1, ZHANG Xuan1, HU Wenxuan1, ZHOU Liucheng2, LIU Shijie3, ZHENG Dayong3
1. State Key Laboratory of Mechanics and Control for Aerospace Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
2. State Key Laboratory of Aerospace Power System Safety and Plasma Technology, Air Force Engineering University, Xi’an 710038, China;
3. Laboratory of Science and Technology on Cryogenic Liquid Propulsion, Beijing Aerospace Propulsion Institute, Beijing 100076, China
As an effective metal surface modification technology, laser shock peening (LSP) has shown exciting application prospects in improving the fatigue properties and service life of additively manufactured (AMed) metals. Firstly, the development and classification of LSP technology and AM technology are briefly introduced. Then the research progress of LSP as a post-treatment method to improve the fatigue performance of AMed metals is overviewed, along with the mechanism of improving fatigue performance from the aspects of LSP induced changes in porosity, microstructure and residual stress near the AMed metal surface. Furthermore, the combinational technique that incorporates LSP during AM process to improve the fatigue performance of AMed metals is surveyed, and the reasons for the significant improvement of fatigue performance are analyzed in terms of the in-situ LSP induced surface residual compressive stress and its distribution depth. Finally, the summary and outlook on the research directions of LSP in improving fatigue performance of AMed metals are provided.
2023, 
