Influence of the energy density on the Young modulus and fatigue strength of Inconel 718 produced by L-PBF

Abstract

Abstract. The present work analyses the influence of the energy density on the Young modulus and the fatigue strength of specimens obtained by Laser-Powder Bed Fusion (L-PBF) in Inconel 718. The specimen production and the process parameters taken as variables are described. The bulk and surface properties of the material are studied through static mechanical tests, surface roughness measurements, and fatigue tests. In addition, an approach based on ping tests and laser interferometry is proposed as a more efficient way to calculate the Young modulus of the specimens. The proposed method does not require any preparation of the specimens and allows for a quick and accurate evaluation of the material’s Young modulus. The results obtained highlight the influence of the process parameters on the Young modulus and the fatigue strength, suggesting a different usage of the material based on the productivity parameters adopted.