| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
| Presentation Title |
Revealing the Critical Role of Volumetric Defects in the Fatigue Behavior of LB-PBF Ti-6Al-4V |
| Author(s) |
Muztahid Muhammad, Arun Poudel, Salman Yasin, Shuai Shao, Nima Shamsaei |
| On-Site Speaker (Planned) |
Shuai Shao |
| Abstract Scope |
Fatigue failure of laser beam powder bed fused (LB-PBF) Ti-6Al-4V parts in machined surface condition can almost always be traced back to one or a group of volumetric defects, including gas-entrapped pores, key holes, and lack-of-fusion defects. Their size, shape, and location can influence the initiation of fatigue cracks, which occupies a major portion of fatigue lives in the high cycle fatigue regime. Building upon a fracture mechanics-based defect sensitive fatigue model, this work aimed to correlate the defect characteristics with the fatigue performance of LB-PBF Grade 5 Ti-6Al-4V specimens. Prior to tests, extensive non-destructive evaluation via X-ray computed tomography were performed to first characterize various types of defects via several geometrical metrics. The metrics of the fatigue critical defects measured from the fracture surfaces post-test, together with their location information, were then correlated with the fatigue performance of Ti-6Al-4V specimens via a data-analytics approach. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Titanium, Additive Manufacturing |