Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 177, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2023.107931
Keywords
Selective Laser Melting; High Cycle Fatigue; Low Cycle Fatigue; Stainless steel; Aluminum alloy
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This work investigated the low-cycle fatigue and high-cycle fatigue behaviors of selective laser melted AISI 316L and AlSi10Mg. The results revealed that crack nucleation mainly occurs close to the surface due to poor surface quality and presence of near-surface defects. The analysis of fracture surfaces confirmed the ductile behavior of the investigated alloys with the presence of micro-dimples.
In the last years, additive manufacturing has widely adopted to enable lightweight design based on the topological optimization. In fact, this technology allows generation of lattice structures with complex geometries and small thicknesses. In this work, both the low-cycle-fatigue and high-cycle-fatigue behaviors of selective laser melted AISI 316L and AlSi10Mg were investigated. Fatigue samples were designed to characterize small parts and tested in the as-built condition since reticular structures are usually adopted without any finishing operation. Microstructural features were studied by light-optical microscopy and scanning-electron microscopy. Finally, fatigue failures were studied considering the fracture mechanics principles with the Kitagawa-Takahashi diagram. The analysis of fracture surfaces revealed that crack nucleation mainly occurs close to the surface because of both poor surface quality and presence of near-surface defects. As expected, because of the face-centered cubic lattice, the final rupture of all the investigated alloys was characterized by micro-dimples confirming the presence of a ductile behavior.
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