PSI - Issue 37

Jesús Toribio et al. / Procedia Structural Integrity 37 (2022) 1007–1012 Jesús Toribio / Procedia Structural Integrity 00 (2021) 000 – 000

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It is worth noting the existence of colonies whose lamellae have not been oriented in the direction of the drawing process ( pearlitic pseudocolonies ) that exhibit an anomalous interlaminar spacing, much greater than that of the rest of the microstructure (Toribio et al., 1997). The aforesaid microstructural features influence the posterior fracture behaviour of the cold drawn pearlitic steels (Park and Bernstein, 1979; Dollar et al., 1998; Toribio and Ayaso, 2003), inducing anisotropy related to fracture and structural integrity in this kind of materials (Toribio and Ayaso, 2003). 2. Materials and methods Manufacture of prestressing wires is made by progressive (multi-stage) cold drawing of pearlitic steels to increase the strength by a strain hardening mechanism. Fig. 1 shows two views of a real cold drawing chain, whereas Fig. 2 sketches the cold drawing process with multiple passes.

Fig. 1. Manufacture of prestressing wires by progressive cold drawing: two views of a real cold drawing chain.

Fig. 2. Schematic presentation of the cold drawing process with multiple passes through the dies.