Abstract
While the influence of strain-aging on the endurance limit and on the dislocation behaviour during cyclic deformation has received some attention in the literature, almost no attention appears to have been paid to the influence of strain aging on fatigue crack propagation. An influence of strain aging on fatigue propagation can be expected to manifest itself most clearly at the very small propagation rates near ..delta..K /SUB th/ , the fatigue crack propagation threshold. The present study was therefore performed to determine whether an influence attributable to strain aging could be detected near ..delta..K /SUB th/ during tests carried out on two mild steels having different sensitivities to strain aging.
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