Comparison of Residual Stresses in Inconel 718 Simple Parts Made by Electron Beam Melting and Direct Laser Metal Sintering

Residual stress profiles were mapped using neutron diffraction in two simple prism builds of Inconel 718: one fabricated with electron beam melting (EBM) and the other with direct laser metal sintering. Spatially indexed stress-free cubes were obtained by electrical discharge machining (EDM) equival...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2015-03, Vol.46 (3), p.1419-1432
Main Authors: Sochalski-Kolbus, L. M., Payzant, E. A., Cornwell, P. A., Watkins, T. R., Babu, S. S., Dehoff, R. R., Lorenz, M., Ovchinnikova, O., Duty, C.
Format: Article
Language:English
Subjects:
Balancing
Characterization and Evaluation of Materials
Chemistry and Materials Science
Construction
direct laser metal sintering
Electron beam melting
Inconel 718
MATERIALS SCIENCE
Mathematical analysis
Melting
Metallic Materials
Nanotechnology
neutron diffraction
Nickel base alloys
Powder metallurgy
residual stess
Residual stress
Sintering
Sintering (powder metallurgy)
Stresses
Structural Materials
Superalloys
Surfaces and Interfaces
Thin Films
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Summary:Residual stress profiles were mapped using neutron diffraction in two simple prism builds of Inconel 718: one fabricated with electron beam melting (EBM) and the other with direct laser metal sintering. Spatially indexed stress-free cubes were obtained by electrical discharge machining (EDM) equivalent prisms of similar shape. The (311) interplanar spacings from the EDM sectioned sample were compared to the interplanar spacings calculated to fulfill stress and moment balance. We have shown that applying stress and moment balance is a necessary supplement to the measurements for the stress-free cubes with respect to accurate stress calculations in additively manufactured components. In addition, our work has shown that residual stresses in electron beam melted parts are much smaller than that of direct laser metal sintered parts most likely due to the powder preheating step in the EBM process.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-014-2722-2