Influence of Laser Shock Peening (LSP) on the Material Properties of Additive Manufactured IN718

Surface treatments such as laser shock peening (LSP) have been attempted to increase the usability of additive manufactured (AM) IN718. This paper investigates the influence of industrial LSP on IN718 manufactured by both the traditional wrought and AM process. The result of the mechanical properties and microstructure of the produced specimens, directly after the manufacturing process and after AMS 5663 heat treatment are presented. The LSP treated AM component has around 25% less compressive residual stress throughout the depth as compared to its wrought counterpart despite using the same LSP energy densities. Microstructural characterisation technique (EBSD) suggested that the AM IN718 has a higher stored strain energy as compared to the wrought components.