Abstract
The micromechanics of crack initiation and early growth in 4340 steel is studied using the SEM, and it is found that growth is discontinuous and transgranular, with the distance between growth steps corresponding to the prior austenite grain size spread. The lowest observed growth rate is approximately one lattice spacing per cycle. It is shown that cyclic growth of even the smallest cracks can be described using the fracture mechanics formalism, if the influence of debonded inclusions is taken into account.
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