首页|Fatigue behavior and modeling of additively manufactured IN718: The effect of surface treatments and surface measurement techniques
Fatigue behavior and modeling of additively manufactured IN718: The effect of surface treatments and surface measurement techniques
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NSTL
Elsevier
In this study, the effect of various surface treatments, including sand-blasting, drag-finishing, turning, grinding, and grinding + drag-finishing, on surface roughness and fatigue properties of laser beam powder bed fused Inconel 718 was examined. The surface roughness values obtained from two surface measurement techniques, i.e., optical microscopy and X-ray computed tomography, were compared. Both surface measurement techniques consistently indicated that all surface treatments led to improvements in surface roughness, although optical microscopy was influenced by surface glares and overestimated the surface roughness values of drag-finished specimens. Accordingly, all surface treatments also led to improvement in fatigue resistance with sandblasting and drag-finishing yielding the least while grinding + drag-finishing causing the most. Notably, only the cracks of grinding + drag-finished specimens initiated from crystallographic facets while those in other conditions were surface initiated. Furthermore, by treating the surface valleys as micro notches, an effective fatigue notch factor model using a hybrid surface roughness metric that incorporates several standard surface roughness parameters was shown to correlate the fatigue lives of 94 % of specimens with various surface conditions within a scatter band of three.
Laser beam powder bed fusion (LB-PBF/L-PBF)Post surface treatmentSurface roughnessFatigue modelingFatigueROUGHNESS
Lee, Seungjong、Shao, Shuai、Wells, Douglas N.、Zetek, Miroslav、Kepka, Miloslav、Shamsaei, Nima
NSTL
Elsevier
