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High strain rate compressive behavior of laser powder bed fused Inconel-718

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dc.contributor.authorHasani, Navid
dc.contributor.authorCHALASANI, DHARMENDRA
dc.contributor.authorAlaghmandfard, Reza
dc.contributor.authorKeshavarzan, Mohsen
dc.contributor.authorForooghi, Foroozan
dc.contributor.authorsanjari, mehdi
dc.contributor.authorShalchi Amirkhiz, Babak
dc.contributor.authorJanaki Ram, G.D.
dc.contributor.authorPirgazi, Hadi
dc.contributor.authorKestens, Leo
dc.contributor.authorOdeshi, Akindele
dc.contributor.authorMohammadi, Mohsen
dc.date.accessioned2025-02-24T06:39:43Z
dc.date.available2025-02-24T06:39:43Z
dc.date.issued2024-12-31
dc.descriptionThe version of record of this article, first published in Materials Science and Engineering: A, is available online at Publisher’s website: https://doi.org/10.1016/j.msea.2024.147782
dc.description.abstractInconel-718 (IN718) is extensively utilized in the aerospace industry, notably in applications such as aircraft engines, facing a constant risk of foreign object impact loadings. Limited studies exist on the dynamic behavior of IN718 under high strain rate loadings, crucial for addressing the challenges of elevated operational temperatures and impact risks in aircraft engines. The dynamic deformation behavior of IN718 samples processed by laser powder bed fusion (LPBF) was studied at varying strain rates. True stress-strain curves showed rapid flow stress increase and semi-serrated stress-strain curves due to strain hardening and thermal softening competition. AMS 5664 heat treatment borrowed from the aerospace materials specifications (AMS) for nickel alloys led to a 28 % increase in ultimate compressive strength (UCS) at high strain rates. The aging treatment led to precipitation of uniformly distributed strengthening γ" and γ′ phases. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) investigations revealed adiabatic shear band (ASB) formation during high strain-rate deformation, indicating local temperature rise. High-density dislocation networks and nanoscale γ" and γ′ precipitates enhanced IN718 strength by inhibiting dislocation motion. Electron backscatter diffraction (EBSD) analysis highlighted texture changes, and the impact of strain rate on grain size distribution was observed. Slip activity increased after heat treatment, influencing ductility. Analysis of twins, kernel average misorientation (KAM), low-angle grain boundaries (LAGBs), and high-angle grain boundaries (HAGBs) were performed to investigate their contribution to the strength properties. Fracture surface analysis at 5150 s 1 revealed a complex mechanism, with outer regions exhibiting ductile features and inner regions indicating shear fracture. The Chang-Asaro (CA) model predicted IN718 flow behavior under high strain rates, subsequently incorporated into ABAQUS Explicit software for numerical simulation. Lagrangian smoothed particle hydrodynamics (SPH) in combination with the VUHARD subroutine were employed to simulate the SHPB experiments. The constitutive model incorporated in the subroutine accurately captured the nonlinear behavior of the specimens, such as equivalent plastic strain and temperature. The results demonstrated a strong validation between the experimental and numerical methodologies.
dc.description.sponsorshipAtlantic Canada Opportunities Agency (ACOA)- Atlantic Innovation Fund (AIF)- 210414
dc.description.versionPeer Reviewed
dc.identifier.doi10.1016/j.msea.2024.147782
dc.identifier.urihttps://hdl.handle.net/10388/16615
dc.language.isoen
dc.publisherElsevier
dc.rightsAttribution-NonCommercial-NoDerivs 2.5 Canadaen
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/2.5/ca/
dc.subjectLaser powder bed fusion
dc.subjectInconel 718
dc.subjectDynamic deformation behavior
dc.subjectSplit-hopkinson pressure bar (SHPB)
dc.subjectConstitutive modeling
dc.titleHigh strain rate compressive behavior of laser powder bed fused Inconel-718
dc.typeArticle

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