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Study of fatigue damage micromechanisms in a duplex stainless steel by complementary analysis techniques

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2009
auteur(s) El Bartali Ahmed; Aubin Véronique; Degallaix Suzanne
journal (abréviation) Advanced Engineering Materials (Adv Eng Mater)
volume (numéro) 11 (9)
pages 727 – 731
résumé The low-cycle fatigue (LCF) damage micromechanisms are studied in a duplex stainless steel at room temperature using complementary analysis techniques. Surface damage is observed in real-time with an in-situ microscopic device during a low-cycle fatigue test. Slip systems activated in each grain in each phase are identified from SEM photographs and EBSD measurements. The surface relief appeared at the end of the test is measured with an interferometric profilometer. Displacement and strain fields on the microstructural scale are calculated using DIC technique from surface images taken during cycling. Observations were combined to analyse damage mechanisms from slip marking appearance to strain localisation and crack initiation.
mots clés Duplex stainless steel, low-cycle fatigue, EBSD, relief measurement, kinematical field measurement
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