By: Buffalo Manufacturing Works Team | January 4th, 2019

Effect of Structural Support on Microstructure of Nickel Base Supperalloy Fabricated by Laser-Powder Bed Fusion Additive Manufacturing by EWI Engineers Hyeyun Song, Tom McGaughy, and Alber Sadek has been published in the journal ADDITIVE MANUFACTURING. The article, co-authored by their colleague Wei Zhang at The Ohio State University, will appear in Volume 26 of the journal in March. It is currently available online.

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INCONEL® 718 builds are produced by
laser-powder bed fusion additive manufacturing for cubic geometries with and
without structural support. The effect of support on the as-built
microstructure is studied based on the microstructural characteristics and
micro-hardness variations. Particularly, the microstructure is examined by
optical microscopy, and scanning and transmission electron microscopy. The precipitates are
identified via high-resolution energy dispersive X-ray spectroscopy and
selected area diffraction. Hardness distribution on cross sections parallel and
perpendicular to the build direction is mapped. Furthermore, it is developed a
lumped-capacity solution to heat conduction coupled with a quasi-steady state
temperature solution for moving point heat source. These analytical solutions,
taking into account various processing parameters, are used to explain the
observed microstructure similarity with and without support. The comprehensive
set of microstructure data is useful for future work of modelling
processing-microstructure relation as well as optimizing post-fabrication heat

To read or download this article, click here. After February 17, 2019, the article may be purchased through Science Direct.  EWI members can request a copy from EWI at

If you would like to contact the authors, they can be reached at or 614.688.5000.

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