Structure and Mechanical Properties of Steel Steam Turbine Rotor Blades after Operation

Keywords

titanium hydride, porous materials, microstructure, powders

Abstract

Damage to the high-pressure rotor blade was due to a somewhat underestimated resistance of steel to brittle fracture, weakening of grain boundaries and interpacket boundaries by lamellar cementite particles, and overloading of the blades due to a significant number of rotor shutdowns. Under the influence of condensate formed during the operation of the rotor, all these factors contribute to the occurrence of corrosion damage to the leading edge of the blade. From these defects, cracks initiate and propagate by the mechanism of inter- and transgranular fracture, which is typical for high-cycle corrosion fatigue of such steels.