Abstract
This paper considers the optimization problems of heat treatment for steam and gas turbine blades, disks, shafts and rotors manufactured from 9–12% Cr steels. The quenching from sizing die conditions have been devised for turbine blades, proving a combination of high creep resistance, creep fracture and crack resistance. There is a need to achieve the optimization of the composition and heat treatment for turbine disks, shafts and rotors, at the same time providing high mechanical properties in combination with the stability of the structure and long-term properties. Investigations on creep resistance and creep fracture had been carried out for periods of 150 000 h and beyond.
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