| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing of Titanium-based Materials: Processing, Microstructure and Material Properties
|
| Presentation Title |
Ti-6Al-4V Microstructure Outcomes and Effects in PBF-LB Fatigue Samples Across Varied Laser Power and Velocity |
| Author(s) |
Evan B. Adcock, Austin Ngo, Brett Ley, Anthony Rollett |
| On-Site Speaker (Planned) |
Evan B. Adcock |
| Abstract Scope |
Additive manufacturing can have many advantages for the production of end-use parts such as flexibility of design and consolidation of assemblies, however numerous printing conditions must be controlled to meet part performance requirements. The University Leadership Initiative tested fatigue life performance for Ti-6Al-4V fatigue bar samples produced in powder bed fusion by laser-beam (PBF-LB) with variations to laser velocity and power in the as-built, stress-relieved state. The parameters encompassed the keyhole porosity, lack-of-fusion porosity, and process window regimes. Experimental fatigue life results strongly correlated with porosity development, but some fatigue fractures in the process window showed crack initiation from microstructure. A subsequent investigation of microstructure observations in the fatigue bars was conducted. Primarily martensitic α’ structure was observed for process window and lack-of-fusion samples, however diffusional α/β structure becomes more prevalent for slower velocity, higher power parameters. Further analysis is underway to illustrate microstructure impact on fatigue life. |