Abstract
Scanning electron microscopy has been used to observe the fracture surfaces of case crushing of carburized steel. It is shown that the surface features on the faces of the main cracks are scaly patterns. The surface features on the faces of the branching cracks are of two types. The fatigue steps and dimples are homologous to the material of higher toughness and the fragmentary patterns to the brittle material. Energy spectrum analysis and electron diffraction were employed to determine the composition and structure of the spherical particles on the fracture surface. It is confirmed that the spherical particles are α-Fe. A possible model for the formation of the spherical particles is proposed.
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