Abstract
Metal parts obtained by the layer-wise selective melting of a powder bed are characterized by surfaces that are considerably rougher than conventionally machined parts. Original fatigue data of L-PBF Inconel 718 obtained with specimens after individual surface roughness characterization demonstrates the considerable scatter and fatigue debit with respect to machined surfaces. Since in many engineering applications surface machining and polishing is not a viable solution, fatigue-critical applications of L-PBF Inconel 718 require an understanding of the link between surface quality and fatigue. A fatigue model accounting for the roughness-related stress concentration at as-built surface micronotches is presented and discussed.
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Nicoletto, G., Uriati, F. (2022). Fatigue Behavior of As-Built L-PBF Inconel 718 and Surface Roughness-Based Modeling. In: Lesiuk, G., Duda, S., Correia, J.A.F.O., De Jesus, A.M.P. (eds) Fatigue and Fracture of Materials and Structures. Structural Integrity, vol 24. Springer, Cham. https://doi.org/10.1007/978-3-030-97822-8_39
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DOI: https://doi.org/10.1007/978-3-030-97822-8_39
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