The sheared fracture surface of plane carbon steel has been examined by using optical and electron microscopy in order to study the change of dimple pattern with shearing edge displacement.
The results obtained are as follows:
(1) The elongated dimple pattern predominates on the sheared fracture surface.
(2) The average dimple size is larger in the annealed steel than in the quenched and tempered steel.
(3) The dimple size of the annealed steel increases with increasing shearing edge displacement.
(4) In the case of S30C annealed steel, the average dimple size increases with decreasing the rate of strain hardening.
