Study on Effection of Embrittlement to Creep Crack Growth Life of Turbine Rotor Based on Electrical Resistance

摘要

During service at elevated temperatures and high stress, turbine rotor materials suffer aging, temper embrittlement, radiation embrittlement, and so on. A decrease of toughness, strength and fracture toughness is caused when such embrittlements take place in turbine rotor. And the extending time from the original crack to the critical crack is shortened, thus the creep crack growth life is affected. In the present paper, through the analysis of embrittlement, along with the rate of the creep crack growth of turbine rotor, the size of critical crack and the fracture toughness and electrical resistance, the relationship between creep crack growth life and electrical resistivity was established. The remaining creep life of turbine rotor was assessed by the relationship and the change value of resistivity.