| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing Fatigue and Fracture: Developing Predictive Capabilities
|
| Presentation Title |
Rotating Bending Fatigue Behavior of EB-PBF Ti-6Al-4V with Globular Alpha Surface Layer |
| Author(s) |
Nicholas Derimow, Keenan Hanson, Jake Benzing, Newell Moser, Orion Kafka, Nik Hrabe |
| On-Site Speaker (Planned) |
Keenan Hanson |
| Abstract Scope |
A surface layer comprised of globular alpha has been identified in electron beam powder bed fusion (EB-PBF) titanium alloy (Ti-6Al-4V), and the effect of this surface layer on rotating bending fatigue behavior (ISO 1143) will be discussed during this talk. The globularization of alpha occurs due to post-build plastic deformation during normal sintered powder removal blasting, followed by standard Ti-6Al-4V hot isostatic pressing heat treatment. Three surface layer thickness conditions were studied by varying blasting working distance, i.e. the separation of the blasting nozzle from the part being blasted. An additional condition with no surface layer was studied by replacing blasting with ultrasonic techniques to remove powder. Microstructure (SEM-EBSD), porosity (x-ray CT), and surface roughness (optical profilometry) were characterized. The influence of this globular alpha surface layer on fatigue behavior will be discussed in the context of the ability to tune fatigue response through control of the surface layer thickness. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Titanium, |