Abstract
Microstructurally small crack growth was monitored in Ti-6Al-4V and Ti-6Al-2Sn-4Zr-2Mo with equiaxed and bi-modal microstructures. The influence of the microstructure was assessed to obtain an improved understanding of the lifetime variability observed in Ti alloys. Primary α grains, basal plane cracking and misalignment across boundaries were identified as key features for high crack growth rates. The origin of life debits encountered under dwell-fatigue loadings was also investigated through crack growth monitoring with the introduction of load holds at peaks stress. Dwell periods were found to induce a substantial small crack acceleration.
Original language | English (US) |
---|---|
Article number | 106699 |
Journal | International Journal of Fatigue |
Volume | 156 |
DOIs | |
State | Published - Mar 2022 |
Keywords
- Dwell-fatigue
- Fatigue crack growth
- Low cycle fatigue
- Microstructure
- Titanium alloys
ASJC Scopus subject areas
- Modeling and Simulation
- General Materials Science
- Mechanics of Materials
- Mechanical Engineering
- Industrial and Manufacturing Engineering