Reverse bending fatigue of 316L stainless steel components produced by laser powder bed fusion (original) (raw)

The freedom to manufacture metal components with very complex geometries using additive manufacturing techniques, such as laser powder bed fusion (LPBF), has opened new possibilities to produce innovative solutions with a high technological impact. It is therefore pivotal to have a detailed knowledge of the performance characteristics, both in the short and in the long term. Within this framework, this study firstly highlights the monotonic tensile properties of the LPBF samples by changing the laser scanning speed, the layer thickness, and the building orientation. Then, within the same process conditions, the fatigue life is investigated through reverse bending loading tests. The results verify an improved resistance, a reduced rigidity, and a strong anisotropy for the LPBF specimens if compared to the bulk material. The dependence on the orientation, together with the porosity of the LPBF samples, are the primarily responsible for the reduction of the fatigue limit.

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