Status of Titanium Aluminide for Aero Engine ApplicationsWednesday (28.09.2016) 14:45 - 15:15 Part of:
Advances in gas-turbine development are driven by the need to reduce fuel consumption, emission and costs. From the material aspect, these requirements enhanced the development of highly creep and oxidation resistant materials of greater temperature than titanium alloys and of lower density than nickel superalloys. Advanced TiAl alloys are complex multiphase alloys which can be processed by ingot or powder meallurgy as well as optimized by thermomechanical processing and / or subsequent heat treatments. Nb and Mo containing TNM alloys have been developed which are equally suited. Technical feasibility of manufacturing a turbine blade by means of a isothermal forging process has been demonstrated. Subsequent, two-step heat treatments were conducted to adjust balanced mechanical properties, i.e. a sufficiently high plastic fracture strain at room temperature and good creep properties at elevated temperatures.