Abstract
Effects of different notches on tensile property and low cycle fatigue (LCF) property of TC17 titanium alloy were studied. The results show that the tensile strength of the alloy increases and elongation (δ) decreases with the increase of notch stress concentration factor (Kt), and a sharp decline in LCF life can be observed when Kt is greater than 1.92. Fracture analysis indicates that the tensile fracture is a mixed type dominated by transgranular fracture mode. The intergranular fracture characteristics in notched specimens are more obvious. Fatigue crack in smooth specimen originates at the surface, while in notch specimens, fatigue crack originates at the notches at both ends, and the fatigue fracture area is smaller than that in smooth specimen. Micro morphology in crack propagation zone is characterized by numerous fatigue striations and secondary cracks. Fatigue striation width in smooth specimens is smaller and secondary cracks are shorter.
| Original language | English |
|---|---|
| Pages (from-to) | 68-72 |
| Number of pages | 5 |
| Journal | Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment |
| Volume | 37 |
| Issue number | 11 |
| State | Published - 25 Nov 2016 |
Keywords
- Fracture analysis
- Low cycle fatigue
- Notch
- TC17 titanium alloy
- Tensile properties