Effect of surface roughness on fatigue performance of additive manufactured Ti–6Al–4V

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Torsional fatigue behavior of wrought and additive manufactured Ti-6Al-4V by powder bed fusion including surface finish effect (2017, background): “[38] observed the importance of surface finish effect for axial loading, with the effect becoming more pronounced in the HCF regime.”
High cycle fatigue behavior and life prediction for additively manufactured 17-4 PH stainless steel: Effect of sub-surface porosity and surface roughness (2020, unknown): “equivalent initial flaw size approach) crack representing the ‘as-built’ condition [14,29], and (iii) measuring the dimensions of surface features for applying ‘short crack’ fracture mechanics concepts [10,14].”
Multiaxial fatigue behavior of wrought and additive manufactured Ti-6Al-4V including surface finish effect (2017, result): “The longer life is not surprising, because a better surface finish generally improves the fatigue life and this agrees closely with results reported in the literature for surface finish effects under axial loading [12,48].”