| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing Fatigue and Fracture: Towards Rapid Qualification
|
| Presentation Title |
Insights into the Effect of Underlying Microstructure on the Fatigue Performance of Fully Lamellar Ti-6Al-4V |
| Author(s) |
Samuel J. Present, Mo-Rigen He, Monica Soare, Johan Reimann, Laura Dial, Kevin Hemker |
| On-Site Speaker (Planned) |
Samuel J. Present |
| Abstract Scope |
Fatigue studies of additively manufactured metals and alloys have elucidated the fact that underlying microstructural features can profoundly affect fatigue life. During cyclical loading of Ti-6Al-4V, slip often localizes within globular or grain boundary alpha, leading to fatigue crack initiation and growth. In the current study, the effect of a fully lamellar alpha + beta microstructure without the presence of globular or grain boundary alpha was characterized with respect to fatigue performance. A novel milli-scale four-point bending fatigue technique was employed to identify the specific location for localized plastic deformation in direct metal laser melted (DMLM) Ti-6Al-4V samples. Cross-correlation with EBSD maps and TEM of the underlying microstructure facilitated identification of critical nucleation sites and highlighted the importance of prismatic slip and shear bands. These experimental results were used to underpin finite element simulations to characterize the effect of local grain morphology and orientation on fatigue performance. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Titanium, Other |