| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing Fatigue and Fracture IV: Toward Confident Use in Critical Applications
|
| Presentation Title |
Fatigue Crack Growth Mechanisms and Design-qualification Considerations in Ti-6Al-4V Alloys Fabricated by Three Powder-based Additive Manufacturing Technologies |
| Author(s) |
Yuwei Zhai, Haize Galarraga, Robert Warren, Diana A. Lados |
| On-Site Speaker (Planned) |
Diana A. Lados |
| Abstract Scope |
There are many additive manufacturing (AM) processes that have been used for the fabrication and repair of Ti-6Al-4V components, each process providing different mechanical properties due to its unique thermal history. This presentation systematically discusses and compares the processing-microstructure-property relationships in Ti-6Al-4V alloys produced by three powder-based AM technologies: Laser Engineered Net Shaping (LENS), Electron Beam Powder Bed Fusion (EBM), and Laser Powder Bed Fusion (LPB). First, the relationships between thermal histories and resulting microstructures will be presented and discussed. Further, the fatigue crack growth behavior for different orientations (with respect to the deposition direction), stress ratios, and heat treating conditions will be addressed, and damage mechanisms at the microstructural scale at different crack growth stages will be identified. The results will then be broadly reviewed from the perspective of design for fatigue resistance and life predictions in high-integrity applications. Opportunities and directions towards material/part qualification will also be discussed. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |