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Correlation between cyclic deformation behaviour and microstructure in a duplex steel between 300 and 700 k

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2003
auteur(s) Alvarez-Armas Iris; Armas Alberto Franklin; Herenu S.; Degallaix Gérard; Degallaix Suzanne
journal (abréviation) Fatigue & Fracture of Engineering Materials and Structures (Fatig Fract Eng Mater Struct)
volume (numéro) 26 (1)
pages 27 – 35
résumé Cyclic tests performed in the temperature range 300773 K on duplex stainless steel DIN 1.4460 show that the cyclic stressstrain behaviour of this steel is strongly temperature dependent. At 300 and 473 K an almost constant peak tensile stress stage, is followed by a slight softening that continues up to failure in the case of 300 K, but by a secondary hardening at 473 K. Pronounced initial cyclic hardening followed by secondary hardening was the main feature of the temperature range between 573 and 723 K. At 773 K, after a weak hardening stage, a strong softening continues up to failure. The mechanical behaviour and the evolution of the microstructure were analysed, and the internal and the effective stresses were studied. It was found that the internal stress is responsible for the strong hardening that occurs in the intermediate temperature range and for the softening at 773 K.
mots clés cyclic loading; duplex stainless steels; dynamic strain ageing; high temperature; internal an effective stresses; microstructure
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