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Ferritic-martensitic steels are established structural materials for high-temperature applications. However, these steels show characteristic softening under cyclic loading. Based on a comprehensive mechanical characterization, a coupled viscoplastic model was established to describe cyclic softening and lifetime of ferritic-martensitic steels under combined creep-fatigue loading.

Mechanical engineering & materials --- Ferritisch-martensitische Stähle --- Kriechermüdung --- zyklische Entfestigung --- viskoplastische Modellierung --- ferritic-martensitic steel --- creep fatigue interaction --- cyclic softening --- viscoplastic modeling