Creep Fatigue Crack Initiation Behavior of 10%Cr Heat Resistant Steel Under Thermomechanical Loading

Abstract

To adjust the oscillation of renewable energy sources in the discontinuous generation of electricity, power plants will be used to stabilize the fluctuations. Fatigue creep damage on power plant components will be increased, during the frequent start-up and shut-down processes of the units. A pre-loading experiment plan was introduced through the analysis on the insufficient stress-strain behavior of gas turbine rotor under thermomechanical loading described by an existed lifetime estimation model. Based on the data of the pre-loading experiments, the current life prediction model was optimized. By comparison of the simulated stress-strain behavior and estimated fatigue creep life near working condition test at alternating temperatures, the optimized life prediction model was evaluated.

Keywords

• thermomechanical fatigue
• 10%Cr resistant steel
• lifetime estimation
• thermomechanical loading
• pre-loading
• fatigue creep