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Short Crack Initiation during Low-Cycle Fatigue in SAF 2507 Duplex Stainless Steel

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2007
auteur(s) Marinelli Maria-Cecilia; Alvarez-Armas Iris; Degallaix Suzanne
journal (abréviation) Key Engineering Materials (Key Engineering Materials)
volume (numéro) 345-346
pages 343 – 346
résumé In this work, the formation of fatigue cracks is considered as a nucleation process due to the development of a characteristic microstructure formed just beneath the specimen surface. Strain controlled cyclic tests were carried out at room temperature at total strain ranges t = 0.8 and 1.2% in flat specimens of SAF 2507 Duplex Stainless Steel (DSS). The results show that for this DSS, at t = 0.8%, the correlation between phases (Kurdjumov-Sacks crystallographic relation) plays an important role in the formation of microcracks. On the other hand, at t = 1.2%, microcracks initiate in the ferritic phase and the K-S relation does not seem to affect the formation of the cracks.
mots clés Crack Initiation, Duplex Stainless Steels, Low Cycle Fatigue, Microstructure
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