Depth-Resolved Characterization of Centrifugal Disk Finishing of Additively Manufactured Inconel 718
arxiv(2024)
摘要
Surface characteristics are a major contributor to the in-service
performance, particularly fatigue life, of additively manufactured (AM)
components. Centrifugal disk finishing (CDF) is one of many rigid media,
abrasive machining processes employed to smooth the surfaces and edges of AM
components. Within the general family of abrasive machining processes currently
applied to AM, CDF is moderate in terms of material removal rate and the
inertial forces exerted. How CDF alters the underlying microstructure of the
processed surface is currently unknown. Here we employ profilometry and
high-energy X-ray diffraction to characterize surface finish, crystallographic
texture, and anisotropic distributions of residual microscale strain as a
function of depth in CDF-finished Inconel 718 manufactured with laser powder
bed fusion. Surfaces are finished using both unimodal and bimodal finishing
media size distributions. We find that CDF will remove surface textures from AM
components, but generally not alter the bulk texture. CDF is also found to
impart significant amounts of residual microscale strain into the first 100
μm from the sample surface.
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