| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Titanium Technology
|
| Presentation Title |
Clarifying the Different Stages of Dwell-Fatigue in Ti-6Al-4V Using Quantitative Fractography |
| Author(s) |
Lucas Prince, Patrick Villechaise, Loic Dimithe Aboumou, Samuel Hemery |
| On-Site Speaker (Planned) |
Lucas Prince |
| Abstract Scope |
The dwell time sensitivity of fatigue lifetimes in Ti-6Al-4V is currently a major concern in the aerospace industry. While this alloy was often considered immune, significant lifetime debits due to early crack initiation and rapid growth through facet formation across hard-oriented microtextured regions are increasingly documented. In this presentation, we report a thorough analysis of fracture surfaces to relate microstructural features of Ti-6Al-4V to dwell-fatigue lifetime debits. In particular, extensive characterization of spatial and crystallographic orientations was carried out using a combination of quantitative tilt fractography and electron backscatter diffraction. Complementary interrupted tests were performed to assess the contribution of the different fatigue stages to the total fatigue and dwell-fatigue lifetimes. A specific attention was paid to the competition between surface and internal crack nucleation. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Titanium, Mechanical Properties, Characterization |