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About this Abstract
Meeting 2026 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2026)
Symposium 2026 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2026)
Presentation Title Mechanical behavior of as-built IN718 fabricated by coaxial laser wire-directed energy deposition
Author(s) Ajay Kushwaha, Amrita Basak
On-Site Speaker (Planned) Ajay Kushwaha
Abstract Scope This study examines the mechanical behavior, specifically, tensile and low cycle fatigue (LCF) properties of as-built IN718 fabricated using laser wire-directed energy deposition (LW-DED) with Meltio M450 machine. X-ray computed tomography revealed sub-surface gas pores and lack of fusion defects distributed throughout the as-built material. Microstructural analysis showed a mixed morphology consisting of columnar dendrites aligned with the build direction and equiaxed regions at melt pool boundaries, with Nb and Mo segregation and Laves phase formation in interdendritic regions. Room temperature tensile testing produced a yield strength of 620 MPa and an ultimate tensile strength of 903 MPa. LCF testing at total strain ranges of 0.8% and 1% demonstrated scatter in life, with reduced fatigue life at higher strain levels. Fractography, EDS, and EBSD analyses revealed that fatigue crack initiation was governed by sub-surface defects and oxide inclusions with localized strain accumulation at microstructural heterogeneities.
Proceedings Inclusion? Undecided

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