Enhanced mechanical properties and deformation mechanisms in DED Inconel 625 via printing path switching
J.Y. Li, Jiajia Shen, Siyu Yuan, W. Dong, Yaonan Cheng, Yonghao Zhao, João P. Oliveira, Y. Zhang, Kehuan Wang
Abstract
In this work, the effects of printing path switching (0° and 90°) at high linear energy density on the grain structure transition and mechanical properties of directed energy deposition-arc (DED-Arc) Inconel 625 alloys were explored. Microstructural analysis on the DED-Arc 625 with near-equiaxed grains under tensile loading revealed that the deformation initially occurs through planar dislocation glide, followed by the formation of dislocation walls and ‘locking-clamping' structures, which contribute to strain hardening. The interlayer interfaces did not induce adverse effects on mechanical performance. Additionally, the near-equiaxed grain structure maintained superior mechanical properties at elevated temperatures up to 700 °C.