Surface topography process signatures in nickel superalloy 625 additive manufacturing

Published

September 23, 2021

Author(s)

Jason Fox, Angela Allen, Brigid Mullany, Ed Morse, Romaine Isaacs, Marc Lata, Aarush Sood, Christopher Evans

Abstract

Prior analyses of surface measurements performed – by several groups – on laser powder bed fused metals have tended to use ISO standard short wavelength filters and focus on weld tracks, "chevrons" (melt pool wake), and particles. This work, utilizing two sets of nickel superalloy 625 samples fabricated in an EOS M290 three years apart, extends the palette of features analyzed. In addition to the previously identified features, coherence scanning interferometer measurements reveal fine dendritic structures with a base periodicity of order 1 μm and long-range order up to 100 m. Localized areas of radial primary dendrites with orthogonal secondary dendrites are also observed. Additional observations include areas of disordered fine structure, fine particles, and localized thin films, presumably from the plume of condensing metal. The composition of these features is varied, both locally and across the extent of the samples.

Proceedings Title

Joint Special Interest Group meeting between euspen and ASPE Advancing Precision in Additive Manufacturing

Conference Dates

September 21-23, 2021

Conference Location

St. Gallen, CH

Pub Type

Conferences

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Keywords

Laser Powder Bed Fusion, Nickel Superalloy, Surface structure, Microstructure

Citation

Fox, J. , Allen, A. , Mullany, B. , Morse, E. , Isaacs, R. , Lata, M. , Sood, A. and Evans, C. (2021), Surface topography process signatures in nickel superalloy 625 additive manufacturing, Joint Special Interest Group meeting between euspen and ASPE Advancing Precision in Additive Manufacturing, St. Gallen, CH, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=932791 (Accessed December 26, 2024)