Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 134, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2020.105497
Keywords
Additive manufacturing; Post processes; Fatigue; Ti6Al4V; Surface roughness
Funding
- Clean Sky 2 joint undertaking under the European Union [738002]
- Swedish Foundation for Strategic Research
- H2020 Societal Challenges Programme [738002] Funding Source: H2020 Societal Challenges Programme
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A major challenge for additively manufactured structural parts is the low fatigue strength connected to rough as-built surfaces. In this study, Ti6Al4V manufactured with laser powder bed fusion (L-PBF) and electron beam powder bed fusion (E-PBF) have been subjected to five surface processing methods, shot peening, laser shock peening, centrifugal finishing, laser polishing and linishing, in order to increase the fatigue strength. Shot peened and centrifugal finished L-PBF material achieved comparable fatigue strength to machined material. Moreover, the surface roughness alone was found to be an insufficient indicator on the fatigue strength since subsurface defects were hidden below smooth surfaces.
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