UNIAXIAL FATIGUE BEHAVIOR AND LIFE PREDICTION OF ADDITIVELY MANUFACTURED INCONEL 718 WITH DIFFERENT GRAIN MORPHOLOGY

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dc.creatorMuhammad, Muztahid
dc.creatorSoman, Sajith
dc.creatorAhmad, Nabeel
dc.creatorWells, Douglas N.
dc.creatorShao, Shuai
dc.creatorShamsaei, Nima
dc.date.accessioned2024-03-26T16:51:38Z
dc.date.available2024-03-26T16:51:38Z
dc.date.issued2023
dc.description.abstractUnderstanding the fatigue behavior and failure mechanisms is essential for qualifying and standardizing additively manufactured metallic components. This study investigates the uniaxial fatigue behavior and failure mechanisms of laser powder bed fused (L-PBF) Inconel 718 (IN718) specimens with different grain sizes obtained by altering the process parameters and heat treatment. Uniaxial, fully-reversed strain-controlled fatigue tests were conducted on specimens with machined and polished surface conditions. Microstructural analysis and fractography using a scanning electron microscope were performed to measure the sizes of grains and facets. Fatigue cracks were initiated at the persistent slip bands near or at the surfaces rather than process-induced volumetric defects in all cases. The fatigue behavior of L-PBF IN718 specimens was correlated with the sizes of grains and facets. Fatigue life estimation incorporating the NASGRO equation and √𝑎𝑟𝑒𝑎 of the grain sizes was performed and shown to predict fatigue life within scatter bands of five.
dc.description.departmentMechanical Engineering
dc.identifier.urihttps://hdl.handle.net/2152/124370
dc.identifier.urihttps://doi.org/10.26153/tsw/50978
dc.language.isoen_US
dc.publisherUniversity of Texas at Austin
dc.relation.ispartof2023 International Solid Freeform Fabrication Symposium
dc.rights.restrictionOpen
dc.subjectlaser powder bed fusion
dc.subjectInconel 718
dc.subjectfacet
dc.subjectNASGRO
dc.subjectfatigue life prediction
dc.titleUNIAXIAL FATIGUE BEHAVIOR AND LIFE PREDICTION OF ADDITIVELY MANUFACTURED INCONEL 718 WITH DIFFERENT GRAIN MORPHOLOGY
dc.typeConference paper

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2023 International Solid Freeform Fabrication Symposium