Prediction of the cyclic behavior of 316ln stainless steel at room temperature by a dislocation-based cyclic viscoplastic model

D. Goncalves (1, 2) , M. Sauzay (1) , P. Lamagnere (1)

1 CEA-DES (ex-DEN) - CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire)
2 UPMC - Université Pierre et Marie Curie - Paris 6 - UFR de Médecine Pierre et Marie Curie

A polycrystalline dislocation-based cyclic viscoplastic model is proposed to predict the cyclic behaviour of 316LN austenitic stainless steels at room temperature (RT). The evolution laws of the densities of different populations of dislocations are described, by taking into account the physical mechanisms of crystal viscoplasticity. The comparison between the predictions and corresponding experimental results shows that the cyclic behaviour of 316LN stainless steel is reasonably well described, particularly since a very reduced number of adjusted parameters is used and only tensile and relaxation curves are used in the adjustment procedure.

Mots clés: Dislocation density; polycrystal; elasto-viscoplasticity; cyclic behaviour; ratcheting; 316LN stainless steel

Domaines: Physique Nucléaire Expérimentale [nucl-ex]; Physique Nucléaire Théorique [nucl-th]

D. Goncalves, M. Sauzay, P. Lamagnere. Prediction of the cyclic behavior of 316ln stainless steel at room temperature by a dislocation-based cyclic viscoplastic model. LCF8- Eighth International Conference on Low cycle fatigue, Jun 2017, Dresden, Germany. ⟨cea-02434033⟩