| Popis: |
The room temperature fracture and fatigue-crack growth behavior of as-cast Ti-48Al-2Nb-2Cr titanium aluminide next generation turbine blade material was investigated to determining mechanical properties. As-cast samples were tested in the longitudinal and transverse direction at room temperature in air. The effects of changes in sample orientation on the toughness and fatigue crack growth behavior were determined under different loading conditions. In the fatigue tests, the threshold for fatigue cracking was determined in addition to the Paris law slope. The overload toughness obtained in fatigue, Kc, was also determined. SEM fractography was used to document the effects of orientation on the fracture morphology. The effects of sample orientation was found to have minimal effects on the mechanical properties. |
