Abstract
Possessing the highest combination of strength and toughness ever-recorded among bainitic steels, nanostructured bainite is a significant advanced steel due to its simplicity with regards to the alloy design and processing. The outstanding monotonic properties do not necessarily correlate with an optimum fatigue performance. Therefore, prior to the industrial implementation of the microstructure, intensive laboratory-scale research should be carried out to clearly rationalize the microstructure’s behavior under cyclic loadings. This work aims at investigating the first stages of the fatigue crack propagation in a nanobainitic steel. For this purpose, interrupted fatigue testing, with crack initiation assisted by the presence a of focused ion beam (FIB) defect, was conducted, ensuring that the short-crack regime applies, and the crack path was morphologically examined.
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