The effect of carburized surface layers on thefracture toughness of a plain carbon and two low-alloy steels is presented. Experiments show that the major reduction in toughness arises from the suppression of the fracture-shear lips. Propagation of a crack tip through a carburized layer along the whole length of the crack tip results in a marked increase in toughness. This increase is attributed to compressive stresses at the crack tip.
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