Uniaxial fretting fatigue properties of 35CrMoA

Uniaxial fretting fatigue properties of 35CrMoA was investigated by the means of plane to plane contact. The microstructures were observed by canning electronic microscope (SEM). Dislocation structure at the contact area was observed by transmission electron microscopy (TEM).The results indicate that with the increase of stress amplitude, the fretting fatigue life is reduced, and the range is smaller. Fretting wear may accelerate microcrack initiation, and also may delay the microcrack propagation. With the increase of axial stress amplitude, the size of dislocation cell is bigger, and the trend of polygons is more obvious. Contact compressive stress and axial cyclic stress provides the conditions for dislocation slip shear.