This investigation shows how microstructure and surface integrity affect fatigue resistance in titanium alloys, indicating key factors for engineering applications.
The paper investigates the combined effects of microstructural anisotropy and surface integrity on the fatigue performance of Ti6Al4V in wrought-equiaxed (W-E), wrought-lamellar (W-L), and laser powder bed fusion lamellar (LPBF-L) conditions under flood and cryogenic machining. Although the W-E condition shows the highest fatigue limit, it lacks the crack-deflection capability typical of lamellar microstructures. Among the lamellar states, LPBF-L exhibits greater resistance to crack propagation due to its lower anisotropy compared with W-L. Cryogenic machining improves fatigue behavior in all conditions, with lamellar microstructures benefiting the most, as their anisotropy promotes the formation of a thicker plastically deformed layer (PDL).
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Bertolini et al. (2026) studied this question.
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