Laser powder bed fusion(LPBF) is a novel metal-based additive manufacturing (AM) process which offers numerous advantages over conventional material processing routes. There has been significant interest in using LPBF  to manufacture bespoke components. Since LPBF) is a complex thermo-mechanical process, substantial residual stresses (RS) are generated during their manufacture Uniaxial tensile samples have been manufactured for fatigue testing from 316L stainless steel by laser powder bed fusion (LPBF). Laser power bed fusion samples are known to contain high levels of residual stresses, which may influence their fatigue properties, particularly since high tensile stresses are often found at the surface of laser powder bed samples. Residual stress measurements were therefore performed on the samples using the neutron diffraction technique on the instrument Engin-X at the ISIS neutron source at the Rutherford Appleton Laboratory, Didcot, UK . These measurements will be used to quantify the residual stresses in these samples and assess their influence of on the fatigue properties of the samples. Finite element models have also been developed that simulate the laser powder bed fusion process and the post build machining process to reduce the central cross section of the sample to the required gauge diameter and improve the surface finish. The residuals stress measurements performed will also be used to validate these finite element models.  


Residual Stress Measurements in a 316l Uniaxial Fatigue Sample Manufactured by Laser Powder Bed Fusion

Division / Sponsors: 
Pressure Vessels & Piping (PVP)


Paper Proceedings: https://asmedigitalcollection.asme.org/PVP/PVP2020/volume/83815

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