Abstract
The influence of time dependent processes on high temperature fatigue behaviour was studied in wrought, cast and ODS mechanically alloyed nickel base superalloys. Fatigue tests were performed in air and in vacuum at different temperatures and strain rates. In LCF tests the disappearance of strain rate effect on fatigue life in vacuum indicates that fatigue damage is markedly affected by oxidation. In FCG tests the effect of oxidation in wrought alloy is stronger than in other alloys examined. Time dependent fatigue propagation micromechanisms are analyzed and discussed in detail.
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