Evolution of Surface Roughness of Wrought and Additively Manufactured Inconel 718 During Centrifugal Disc Finishing

Rifat, Mustafa; DeMeter, Edward; Basu, Saurabh

doi:10.1007/s11837-024-06504-7

Cited by 2 publications

(4 citation statements)

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“…These observations are in contrast to most shear-based material removal processes which are usually classified as surface severe plastic deformation processes (like machining and burnishing). Recent efforts have attempted to phenomenologically model these phenomena by investigating the coupled evolution of part surface roughness and the media condition with respect to CDF processing time [13]. As the removed surface material here had a relatively strong fiber texture, which will naturally have a strongly anisotropic mechanical response, the effects of its removal will be load-condition dependent.…”

Section: Discussionmentioning

confidence: 99%

“…The transition may arise from evolution of media characteristics [13] during the finishing process, which occurs due to self interactions. Such self interactions are also likely in the bimodal media.…”

Section: Fourier Analysismentioning

confidence: 99%

“…Optimization of abrasive treatments are complicated by process mechanics which often involve severe (subsurface) plastic strains generated by stochastic interactions of the surface with the rigid abrasive media [11,12]. While the surface finish may be improved [13], the microstructure and local residual strain and stress states below the surface are also altered which, in-turn, will alter the local mechanical response. Analysis of these subsurface changes have traditionally been hampered by characterization limitations and as such are generally not optimized.…”

Section: Introductionmentioning

confidence: 99%

“…This transition was accompanied by an increase in the magnitude of residual stresses at ∼70 µm for the U2 specimen. A similar transition was however not seen in the bimodal media that exhibited a decrease in surface roughness and increase in spectral entropy throughout the finishing process.The transition may arise from evolution of media characteristics[13] during the finishing process, which occurs due to self interactions. Such self interactions are also likely in the bimodal media.…”

mentioning

confidence: 99%

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Depth-resolved characterization of centrifugal disk finishing of additively manufactured Inconel 718

Peterson,

Rifat,

DeMeter

et al. 2024

Meas. Sci. Technol.

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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, white light profilometry and high-energy X-ray diffraction are employed 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. The CDF processes employed are found to remove surface crystallographic textures (here a {111} fiber texture) from AM components, but generally not alter the bulk texture (here a cube 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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Section: Discussionmentioning

confidence: 99%

Section: Fourier Analysismentioning

confidence: 99%