Micromechanical modeling of the cyclic softening of EUROFER 97 steel

Abstract : The quenched and tempered reduced-activation ferritic/martensitic steel EUROFER 97 is one of the candidates for structural components of fusion reactors. The cyclic behaviour of this steel during isothermal plastic strain-controlled tests is investigated at room temperature. Under Low-Cycle Fatigue (LCF) tests this steel shows, after the first few cycles, a pronounced cyclic softening accompanied by microstructural changes such as the decrease of the dislocation density inside the subgrain and the vanishing of low-angle boundaries. Based on the identified mechanisms of softening a mean-field polycrystalline model is proposed.
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M.F. Giordana, Pierre-François Giroux, Iris Alvarez-Armas, Maxime Sauzay, A. Armas. Micromechanical modeling of the cyclic softening of EUROFER 97 steel. 11th International Conference on the Mechanical Behavior of Materials (ICM11), Jun 2011, Côme, Italy. pp.1268-1273, ⟨10.1016/j.proeng.2011.04.211⟩. ⟨hal-00605907⟩

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