The evolution of dislocation structure in a quenched and tempered low carbon alloy steel with increasing number of fatigue cycles has been investigated using transmission electron microscopy. The changes in dislocation structure can be divided into three stages: the production of the dislocation structure having fatigue features, the formation of microscopic fatigue slip bands, and the initiation and propagation of wide fatigue deformation bands. Microscopic fatigue cracks are formed during the propagation of these bands.
MST/1037
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