| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing Fatigue and Fracture: Towards Rapid Qualification
|
| Presentation Title |
Characteristics of Non-Spherical Ti-6Al-4V Powder in Laser Powder Bed Fusion: The Effect on Microstructure, Surface Finish and Fatigue Behavior |
| Author(s) |
Mohammadreza Asherloo, Madhavan Sampath Ramadurai, Mike Heim, Dave Nelson, Anthony D Rollett, Muktesh Paliwal, Amir Mostafaei |
| On-Site Speaker (Planned) |
Amir Mostafaei |
| Abstract Scope |
Laser powder bed fusion (L-PBF) processing of non-spherical hydride-dehydride Ti-6Al-4V powders with two different size distributions (50-120 and 75-175 μm) was investigated. The optimized L-PBF parameters resulted in a relative density of >99.8 %. To eliminate residual pores, hot isostatic pressing (HIPing) was applied. The study examined the microstructure, surface roughness, and fatigue performance of various sample conditions, including as-built, surface treated, and HIPed specimens. The results established the relationship between process, structure, and properties for these new feedstocks. Results show comparable fatigue life with spherical powders, and fractography analyses show crack initiation from the rough surface in the as-built specimens, while the subsurface defects in the mechanically ground specimens are responsible for crack initiation and failure. Computed tomography reveals the variation of pore size from subsurface to interior. Even after grinding, residual pores exposed at the surface are stress concentrators and decrease fatigue life under high stress amplitude. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Titanium, Mechanical Properties |