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 language | English |
|---|---|
| Article number | 108285 |
| Number of pages | 11 |
| Journal | International Journal of Fatigue |
| Volume | 184 |
| Early online date | 17 Mar 2024 |
| DOIs | |
| Publication status | Published - Jul 2024 |
Funding
This work is a part of the MoDFAM project supported through the Core Research Program (CRP) No 34751-02. The authors wish to thank The Manufacturing Technology Centre and the MoDFAM consortium for funding this project. W. Vesga and B. Dutton would also like to thank Sigma Additive, M&NDT, CMT and Workshop teams for their valuable contribution to manufacturing, machining and inspecting the samples used in this project.
| Funders | Funder number |
|---|---|
| Manufacturing Technology Centre |
Keywords
- Porosity defects
- Fatigue
- Laser powder bed fusion
- Additive Manufacturing
- Titanium alloys