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Correlation between creep resistance and hardness of steel parts in thermal power plants = Korelacija med odpornostjo proti lezenju in trdote jeklenih delov v termoelektrarnah
Kafexhiu, Fevzi ; Vojvodič-Tuma, Jelena
The correlation between creep resistance and hardness on two different steels, the classical steel X20CrMoV 121 and steel P91 (T91, X10CrMoVNb91) used in parts of thermal power plants was evaluated. ...Specimens were annealed isothermally from 1 h up to 8760 h at the temperatures of 650 °C and 750 °C. After air cooling, the hardness and the resistance to creep were measured. The creep test consisted of 100 h creep test of specimen stressed with 170 MPa at the temperature 580 °C. Primary and secondary creep with different rate was recorded with steels annealed at 650 °C with the initial hardness of HV 224 and HV 223. Primary, secondary and tertiary creep was determined also on steels annealed at 750 °C. The creep resistance of P91 steel was greater for the same hardness compared to the steel X20CrMoV 121. It is confirmed that the hardness could be used as criterion for the evaluation of the residual lifetime of equipment operating at elevated temperature, before more expensive methods of testing are used.
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