Abstract
In this study, the stress gradient effects on the fatigue behavior of 316L stainless steel (SS) specimens fabricated using two different laser beam-powder bed fusion (LB-PBF) processes were investigated, with an emphasis on the surface roughness and volumetric defects. The fatigue behavior of LB-PBF 316L SS largely depended on the applied stress amplitude. Under higher stress amplitudes, rotating-bending specimens generally exhibited better fatigue resistance as compared to the axial specimens subjected to the same nominal stresses. At lower stress amplitudes, the surface roughness and/or volumetric defects became more significant life-limiting factors for LB-PBF 316L SS.
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