Titanium Steam Turbine Blading
- R. I. Jaffee, Electric Power Research Institute, Palo Alto, CA, USA
Application of titanium alloys to the long last stage and L-1 stage of low-pressure steam turbines has been in development for more than 30 years and now appears to be a commercial reality. Titanium blades are used in steam transition L-1 row because they are immune to pitting corrosion by the corrosive early condensates at the Wilson line. A disadvantage of titanium alloys is their low damping capacity, which requires blade designs that maximize mechanical and aerodynamic damping. Protection is not required in the L-1 row due to the water droplet erosion resistance of titanium alloys but the last stage rows operating at supersonic tip speeds require the use of erosion shields.
For manufacturers, researchers, and users of steam and gas turbines worldwide.