 |
Portail HAL - Université de Lille |  |
Article dans une revue
Effect of Interlamellar Spacing on the Low Cycle Fatigue Behavior of a Fully Pearlitic Steel
Abstract : The present study aims at investigating the low cycle fatigue behavior of two fully AISI 1080 pearlitic steels which differed in
their interlamellar spacing (72 ± 15 and 143 ± 32 nm). Low cycle fatigue tests were performed under positive strain control at
different total strain variations (0.6% ≤ Δεt ≤ 1.6%). It is shown that both alloys presented an asymmetric stress response and
a cyclic softening during the first fatigue life fractions. The tension stress peaks were higher for the fine pearlitic steel than
for the coarse one but the compression stress peaks were less different. The extrusion–intrusion pairs formed at the external
surface were more developed for the coarse pearlitic steel. The results suggest that the critical short crack size to propagate
in the bulk is much smaller in the fine pearlitic steel which explains the shorter fatigue lives. For both steels, the entire fracture
surface comprised a fatigue propagation zone, a final fully brittle zone separated by a narrow ductile transition zone.
https://hal.univ-lille.fr/hal-03350080
Contributeur : Lilloa Université de Lille Connectez-vous pour contacter le contributeur
Soumis le : mardi 21 septembre 2021 - 10:10:01
Dernière modification le : mercredi 22 septembre 2021 - 03:39:26
Contributeur : Lilloa Université de Lille Connectez-vous pour contacter le contributeur
Soumis le : mardi 21 septembre 2021 - 10:10:01
Dernière modification le : mercredi 22 septembre 2021 - 03:39:26