Abstract
This paper analyses the fatigue and fracture behavior of a steel with quasi-eutectoid composition (slightly hypereutectoid) and spheroidized microstructure. The fatigue crack surface showed ductile micro-tearings produced by propagating the crack through the thin layer of proeutectoid cementite. The fracture is initiated at the fatigue crack tip in a fibrous zone by microvoid nucleation, which is transformed into a cleavage fractography. Microvoids are observed in the large particles of cementite located in the proeutectoid layer, by decohesion with the matrix or by fracture.
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