Abstract
The effect on microstructure and fatigue threshold of tension-tension fatigue at stress below the fatigue limit and high cycles (10 7) was studied. The results indicate that the fatigue threshold is lowered after low-stress, high-cycle fatigue: the higher the stress, the greater the decrease of fatigue threshold. This result is connected with the increase of dislocation density, dislocation tangles, and the formation of a cellular dislocation structure. It is compared with the effect of monotonic and cyclic prestrain on the fatigue threshold and microstructure.
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