|Cite this article as:|
|Liang Lan, Ruyi Xin, Xinyuan Jin, Shuang Gao, and Bo He, Influences of multiple laser shock peening impacts on microstructure and mechanical properties of Ti-6Al-4V alloy fabricated by electron beam melting, Int. J. Miner. Metall. Mater.,(2021). https://doi.org/10.1007/s12613-021-2322-2|
Laser shock peening (LSP) is an attractive post-processing method to tailor surface microstructure and enhance mechanical performances of additive manufactured (AM) components. The effects of multiple LSP impacts on the microstructure and mechanical properties of Ti-6Al-4V part produced by electron beam melting (EBM), as a mature AM process, were studied in this work. Microstructure, surface topography, residual stress and tensile performance of EBM-manufactured Ti-6Al-4V specimens were systematically analyzed subjected to different LSP impacts. The distribution of porosities in EBM sample was assessed via X-ray computed tomography. The results show that EBM samples with two LSP impacts possess a lower porosity value of 0.05% compared to the value of 0.08% for untreated samples. The strength of EBM samples with two LSP impacts is remarkably raised by 12% as compared with the as-built samples. The grains of α phase is refined in near-surface layer and a dramatic increase in the depth and magnitude of compressive residual stress (CRS) is achieved in EBM sample with multiple LSP treatments. The grain refinement of α phase and CRS with larger depth are responsible for the strength enhancement of EBM samples with two LSP impacts.