The data presented here were obtained as part of the European FP7 MatISSE project to model the softening and relaxation behaviour of Grade 91 steel under creep-fatigue loading because this type of thermal loading is a major degradation mechanism in fast reactors. The supporting tests were focused on strain controlled low cycle fatigue tests with different strain amplitudes (εa = 0.45 %, 0.35 % and 0.25 %) and different tension hold times (1 and 12 hours) for temperature 600°C. The results were compared with results for 24 hour hold time from another testing laboratory (VTT). The results were evaluated with respect to the number of cycles, N, and also as a function of the cumulative plastic strain, p(N).Keywords: Creep-Fatigue; softening; relaxation; P91
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