engleski

Effect of structural characteristics of strengthening phase on creep/fatigue behavior of single crystal nickel base superalloys

The effect of different initial microstructures defined by various precipitates γ morphology was investigated at the creep/fatigue conditions by 900 °C and 500 MPa. The waveform of stress as a function of time for cyclic loading was of trapezoidal shape with a hold time 10 seconds at the upper stress level. TEM was employed to examine the deformation process in a strengthened γ matrix in dependence of γ precipitate morphology. The fracture lifetime and cycles up to fracture were the criteria for the evaluate the additional cyclic component effect on of the course of deformation.

austenite ; creep ; deformation ; fatigue of materials ; fracture ;

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