Changes in the dislocation arrays of high-strength structural steel during fatigue
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Transmission electron microscopy and limited-area diffraction analysis showed that cyclic deformation is accompanied by higher dislocation densities, fragmentation of martensite rods, thickening of the boundaries of fragments, and higher misorientation angles.
During cyclic loading the structure of the surface layers changes more than that of the inner layers.
The total plastic deformation at the level of the fatigue limit is quite small and is quite uneven through the volume of the sample.
KeywordsElectron Microscopy Fatigue Transmission Electron Microscopy Surface Layer Martensite
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