Influence of Deformation Structure on Tensile and Fatigue Fracture in a Fully Pearlitic Steel

ABSTRACT In this experiment tensile and fatigue fracture of a fully pearlitic steel was correlated with developing dislocation configurations. It was found that the tensile fracture is determined by processes in the colonies with lamellae parallel to the tensile axis and that the stress necessary to break a cementite plate corresponds to the U.T.S. It was shown that localized generation of dislocations at the interfaces under fatigue conditions is associated with fatigue crack initiation.