Productivity-oriented SLM process parameters effect on the fatigue strength of Inconel 718. (March 2023)

• Record Type: Journal Article
• Authors: Macoretta, G.; Bertini, L.; Monelli, B.D.; Berto, F.
• Is Part Of: International journal of fatigue. Volume 168(2023)
• Publication Date: 2023-03
• Subjects: Selective laser melting -- S-N curves -- High cycle fatigue -- Surface roughness -- Defects; Materials -- Fatigue -- Periodicals; Materials -- Fatigue; Periodicals; 620.1122
• DOI: 10.1016/j.ijfatigue.2022.107384
• Languages: English
• ISSNs: 0142-1123

Abstract

Highlights: Productivity-oriented SLM process parameter development. HCF assessment of Inconel 718 produced by SLM with as-built surface. FE model of the effective surface roughness profile. Murakami area method for surface roughness effect assessment on fatigue strength. Non-propagating cracks from surface roughness valleys. Abstract: The low productivity of the SLM process is known to be a limiting factor, but speeding up the process can lead to material defects. Two sets of SLM process parameters enhancing its productivity by 50 % were devised and tested in comparison with baseline sets, in terms of material microstructure, porosity, surface roughness, static mechanical properties, and HCF behavior, in the as-built and aged conditions. The as-built surface was investigated. Despite a significant increase in the porosity and surface roughness, the fatigue strength was reduced by 5 %. The Murakami are a R parameter effectively correlates the fatigue strength and surface roughness variations.