Feasibility study of using titanium alloy instead of steel alloy in the last row blade of Ahvaz Ramin power plant to increase the blade life

In this paper, it is possible to change the alloy of the blades of the last row of steam turbine blades of Ahvaz Ramin power plant in order to increase the life with the vibration approach. After entering the geometric model into the ANSYS, dynamic analysis and stress analysis are performed on the model for steel alloy and titanium alloy, as well as crack growth in the single-blade model. In the dynamic analysis, the results showed that when we consider the material of the turbine blades as titanium alloy, we can create better vibration conditions in the turbine blades and prevent the possible occurrence of resonance phenomenon. Also in stress analysis, when titanium alloy is used in the blade, the Von Mises stress obtained is approximately equal to half the stress obtained from the steel alloy. When the blade cracks at the root, the amount of stress intensity calculated in the turbine blade is reduced by almost 50% when the blade is made of titanium alloy.