Abstract
Using scanning electron microscopy, transmission electron microscopy, and X-ray diffraction, some microscopic experiments and analyses were performed to explain the microscopic mechanism of strengthening under low-amplitude loads below the fatigue limit (SLAL). The experimental results show that the microscopic mechanism of SLAL could be dislocation-accumulation and grain boundary strengthening to low-strength material without strengthening by surface heat treatment. After SLAL, the microstructure imperfections can be improved and the fatigue resistance can be enhanced. Macroscopically, the fatigue strength and life of structures can be obviously improved and increased.
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