| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
100 Years and Still Cracking: A Griffith Fracture Symposium
|
| Presentation Title |
Characterization of a Novel Crack Growth Mechanism in Ti-6Al-4V Subjected to Dwell Fatigue at Elevated Temperature |
| Author(s) |
Adam L. Pilchak, John Joyce-Rotella, Nate Levkulich, Sushant Jha, Reji John, Jim Larsen |
| On-Site Speaker (Planned) |
Adam L. Pilchak |
| Abstract Scope |
Life-time debits in titanium alloys under dwell-fatigue conditions are well-documented for near-alpha Ti alloys, but less so for alpha/beta alloys like Ti-6Al-4V. These debits have been linked to microstructural features including microstructure, texture, and micro-texture. Cracks extension generally occurs by transgranular propagation through one large microtextured region in near-alpha alloys. However, in Ti-6Al-4V, we hypothesize that accelerated crack extension is aided by secondary nucleation ahead of the main crack front. To demonstrate this effect, dwell-fatigue crack growth experiments were performed with one interrupted at a specific crack length corresponding to that where we observe the acceleration. The crack morphology and crack surface are investigated via electron backscatter diffraction, white light interferometry, x-ray computed tomography and serial sectioning, to elucidate the complex features susceptible to and responsible for the accelerated crack growth rate. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Titanium, Characterization, Other |