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Cyclic softening behaviour of a duplex stainless steel. Microstructural origin and modelling – Part II: bi-phased polycrystalline modelling of cyclic behaviour

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2009
auteur(s) Evrard Pierre; Aubin Véronique; Degallaix Suzanne; Kondo Djimédo; Alvarez-Armas Iris
journal (abréviation) Material Prüfung (MP)
volume (numéro) 2009/06
  
pages 354 – 358
résumé This second part aims to propose an extension of the bi-phased polycrystalline model shown in a previous contribution [1], in order to simulate the cyclic softening observed in an austenitic-ferritic stainless steel under uniaxial and non-proportional biaxial cyclic loading [2]. Assuming that the cyclic softening for uniaxial and biaxial non-proportional cyclic loading is due to a rearrangement of dislocations in hard (rich in dislocations) and soft (poor in dislocations) zones in ferritic grains [3], the ferritic single crystal law is modified. The new model parameters are identified from TEM observations [3] and by inverse procedure. Finally, the new model is validated for other cyclic loading paths. A good agreement is observed between simulation and experimental data.
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