A High Temperature and High Strength Titanium Alloy with Good Dwell Fatigue Property

High temperature and high strength titanium alloy developments are instrumental in the advancement of gas turbine and aircraft technology. In particular, the near alpha and alpha/beta titanium alloys have a clear advantage of low specific density, good corrosion resistance, and higher operating temperature capability. These titanium alloys are used for critical rotating components such as blades and discs in the high-pressure sections of the compressor. However, the ambient temperature dwell sensitive fatigue in titanium alloys has been a big concern to the gas turbine industries for over decades. The dwell fatigue failure mode is manifested by significant reductions in fatigue life, as measured by the number of cycles to fatigue failure, when the load is held at maximum value. Therefore, with the use of the titanium alloys for critical components in the engine, the potential effects of dwell fatigue continue to compromise the engine design. A significant amount of research has been conducted to develop a high temperature and high strength titanium alloy with good dwell fatigue property. The present study also explores these findings and highlight the fundamental deformation mechanisms controlling dwell behavior.