Effects of multiple laser shock peening impacts on microstructure and wear performance of wire-based laser directed energy deposition 17-4PH stainless steel

作者：Nan Li, Qiang Wang, Wenjuan Niu, Liucheng Zhou, Han Peng, Yu Han, Jiaxu Li, Pu Song, Ning Hu, Nan Guo, Shenao Li, Xinlei Pan · 发表于：Journal of Materials Research and Technology · 年份：2023 · DOI：10.1016/j.jmrt.2023.04.270 · 被引用次数：32 · 研究领域：Surface Treatment and Residual Stress、Metal and Thin Film Mechanics、High Entropy Alloys Studies

As an advanced surface-strengthening technology, laser shock peening (LSP) is suitable for strengthening high-energy beam additive manufacturing components by improving the uneven temperature distribution and mechanical anisotropy problems. The present study investigated the influence of multiple LSP impacts on the microstructure evolution and wear performance of wire-based laser directed energy deposition (LDED) 17-4PH stainless steel. Results showed that with the increase of LSP impacts, the average grain size of the wire-based LDED layer decreases and the dislocation density increases. Meanwhile, the residual stress was completely converted from tensile state to compressive state, and reaches the maximum value of 424±15MPa. In addition, the significant improvement of microhardness and wear resistance after 3 LSP impacts is attributed to the combined effects of grain refinement and dislocation strengthening.