Alloy 706 use, process optimization, and future directions for GE gas turbine rotor materials

The use of Alloy 706 in GE Gas Turbines is described from the initial application in the first F class machines to today's current Advanced F class machines. The process optimization that has occurred during the last decade of use is described. This includes compositional optimization, processing refinements, and improvements in ultrasonic inspection techniques. The future directions for Heavy Duty Industrial Gas Turbine rotor materials and processes is also outlined, This materials and processes work has contributed to the achievement of the most reliable F class gas turbine in the world and will continue to provide growth capability for the next generation of GE machines.