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Materials 2015, 8(11), 7439-7446;

Analysis of Fatigue Crack Paths in Cold Drawn Pearlitic Steel

Fracture and Structural Integrity Research Group, University of Salamanca, E.P.S., Campus Viriato, Avda. Requejo 33, 49022 Zamora, Spain
Author to whom correspondence should be addressed.
Academic Editor: Reza H. Oskouei
Received: 29 July 2015 / Revised: 26 October 2015 / Accepted: 29 October 2015 / Published: 4 November 2015
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In this paper, a fracto-metallographic analysis was performed on the cracked specimens of cold drawn pearlitic steel subjected to fatigue tests. Fatigue cracks are transcollonial and exhibit a preference for fracturing pearlitic lamellae, with non-uniform crack opening displacement values, micro-discontinuities, branchings, bifurcations and frequent local deflections that create microstructural roughness. At the micro-level, the cold drawn pearlitic steel exhibits higher micro-roughness than the hot rolled bar (this is a consequence of the manufacturing process by cold drawing), so that the actual fractured surface in the cold drawn wire is greater than that in the hot rolled bar, due to the fact that the crack deflection events are more frequent and with higher angle in the former (the heavily drawn prestressing steel wire). These findings show the relevant role on the manufacturing process by cold drawing in the fatigue crack propagation in pearlitic steel. View Full-Text
Keywords: pearlite; cold drawing; fatigue crack path; micro-roughness pearlite; cold drawing; fatigue crack path; micro-roughness

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Toribio, J.; González, B.; Matos, J.-C. Analysis of Fatigue Crack Paths in Cold Drawn Pearlitic Steel. Materials 2015, 8, 7439-7446.

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