Influence of SLM process parameters on the surface finish, porosity rate and fatigue behavior of as-built Inconel 625 parts

Imade Koutiri (1) , Etienne Pessard (2) , Patrice Peyre (1) , Ouafae Amlou (1) , Thibaut de Terris (1)

1 PIMM - Laboratoire Procédés et Ingénierie en Mécanique et Matériaux
2 LAMPA - Laboratoire Angevin de Mécanique, Procédés et InnovAtion

This paper is dedicated to understanding fatigue crack initiation for an Inconel 625 manufactured by SLM, using a hatching + contour procedure. In the first part of the paper, an optimum set of parameters was found to deliver the best surface roughness combined with low porosity. This process optimization, mostly focused on adjusting the volume energy density aimed at finding a compromise between an optimum densification state and a minimum number of contaminating spatters. Secondly, a fatigue test campaign has been conducted on as-built SLM samples or polished samples. The analysis of failure surfaces allowed identifying different heterogeneities at the origin of the fatigue damage for each configuration. The embedded particles on the surface of as-build specimens have been shown to play an important role in fatigue and need to be optimized or taken into account in the fatigue strength design of SLM components.

Mots clés: SLM; Particle; Fatigue; Inconel 625; Porosity; Surface finish

Domaines: Mécanique des matériaux [physics.class-ph]

Imade Koutiri, Etienne Pessard, Patrice Peyre, Ouafae Amlou, Thibaut de Terris. Influence of SLM process parameters on the surface finish, porosity rate and fatigue behavior of as-built Inconel 625 parts. Journal of Materials Processing Technology, 2018, 255, pp.536-546. ⟨10.1016/j.jmatprotec.2017.12.043⟩. ⟨hal-01826611⟩