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Abstract
In-beam fatigue experiments have been realized to study the properties of a ferritic-martensitic steel (MANET II) under cyclic stress during bombardment with 590 MeV protons from PSI (Paul Scherrer Institute) accelerator.
This paper reports on three experiments realized at an imposed total strain around 0.7% and at three different temperatures between RT and 573 K. The dose obtained at the end of life was in the order of 0.1 dpa. The in-beam fatigue is characterized by a strongly reduced irradiation hardening. Nevertheless, the fatigue life is dramatically reduced as compared with non irradiated specimen. The life reduction becomes more important as the test temperature is decreased. A simple model for crack growth rate under in-beam deformation is presented.