Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 166, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2022.107219
Keywords
Nanostructured Bainitic Steels; Short Cracks; Fatigue Testing; Crack Path; EBSD; BSE; FIB Defect
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This study investigates the importance of crack-microstructure interactions in the fatigue behavior of nanostructured bainitic steel in the short crack regime. Results show that different crystallographic boundaries play a significant role in the crack path and growth rate, depending on the loading conditions.
For a full exploitation of novel steels in applications under mechanical cyclic loading, it is vital to understand the crack-microstructure interactions. In this work, the fatigue behaviour of a nanostructured bainitic steel in the short crack regime has been studied considering the structural integrity of the material and its polycrystalline nature. For that purpose, a specimen containing an artificial defect has been designed and manufactured, sub-jected to interrupted fatigue testing, and examined by crystallography-sensitive techniques. Results show that, depending on the loading conditions, different crystallographic boundaries can play an important role in the crack path and crack growth rate.
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