Mechanical characterization of an additively manufactured Inconel 718 theta-shaped specimen

Cakmak, Ercan; Watkins, Thomas R.; Bunn, Jeffrey R.; Cornwell, Paris A.; Wang, Yanli; Dehoff, Ryan R.; Babu, Sudarsanam Suresh; Sochalski-Kolbus, Lindsay M.

doi:10.1007/s11661-015-3186-8

Title: Mechanical characterization of an additively manufactured Inconel 718 theta-shaped specimen

Journal Article · Fri Nov 20 00:00:00 EST 2015 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

DOI:https://doi.org/10.1007/s11661-015-3186-8· OSTI ID:1244186

Cakmak, Ercan ^[1]; Watkins, Thomas R. ^[1]; Bunn, Jeffrey R. ^[1]; Cornwell, Paris A. ^[1]; Wang, Yanli ^[1]; Dehoff, Ryan R. ^[1]; Babu, Sudarsanam Suresh ^[2]; Sochalski-Kolbus, Lindsay M. ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

Two sets of “theta”-shaped specimens were additively manufactured with Inconel 718 powders using an electron beam melting technique with two distinct scan strategies. Light optical microscopy, mechanical testing coupled with a digital image correlation (DIC) technique, finite element modeling, and neutron diffraction with in situ loading characterizations were conducted. The cross-members of the specimens were the focus. Light optical micrographs revealed that different microstructures were formed with different scan strategies. Ex situ mechanical testing revealed each build to be stable under load until ductility was observed on the cross-members before failure. The elastic moduli were determined by forming a correlation between the elastic tensile stresses determined from FEM, and the elastic strains obtained from DIC. The lattice strains were mapped with neutron diffraction during in situ elastic loading; and a good correlation between the average axial lattice strains on the cross-member and those determined from the DIC analysis was found. Lastly, the spatially resolved stresses in the elastic deformation regime are derived from the lattice strains and increased with applied load, showing a consistent distribution along the cross-member.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1244186

Journal Information:: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Vol. 47, Issue 2; ISSN 1073-5623

Publisher:: ASM InternationalCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 16 works

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