Defect tolerance and fatigue limit prediction for laser powder bed fusion Ti6Al4V

Abdul Syed, Wilson Vesga, Ben Dutton, Tom Beretshaw, Xiang Zhang

Research output: Contribution to journalArticlepeer-review

Abstract

This study is focused on the individual effect of gas porosity size and location on fatigue strength of a laser powder bed fusion Ti6Al4V alloy. Tensile and fatigue samples were manufactured by artificially seeding gas pores either at the centre or close to surface. Seeded porosity reduced the ductility by 20% and fatigue strength by 33% but had little influence on the static strength. Despite seeded pores, 50% fatigue samples had crack initiation from process inherent defects that also caused fatigue data scatter. A modified Kitagawa-Takahashi diagram was established to predict the fatigue strength under the influence of porosity defects.
Original languageEnglish
Article number108285
JournalInternational Journal of Fatigue
Volume184
Early online date17 Mar 2024
DOIs
Publication statusE-pub ahead of print - 17 Mar 2024

Keywords

  • Porosity defects
  • Fatigue
  • Laser powder bed fusion
  • Additive Manufacturing
  • Titanium alloys

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