PSI - Issue 5

Jesús Toribio et al. / Procedia Structural Integrity 5 (2017) 1446–1453 Jesús Toribio / Structural Integrity Procedia 00 (2017) 000 – 000

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2b draws a typical drawing process with six passes (with diameter reductions) through the corresponding dies, and Fig. 3b sketches a 3D view of the stages of passing trough the afore-said dies.

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(b)

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Fig. 1. Manufacture of prestressing wires by progressive cold drawing: (a) two photographs of a real ( in situ ) cold drawing procedure in the factory; (b) scheme of a typical drawing process with six passes; (c) sketch of a 3D view of such a process.

3. Pearlite microstructure changes during cold drawing

The pearlite microstructural changes during cold drawing (at the two levels of pearlitic colonies and lamellae) were studied by Toribio and Ovejero (1997, 1998a, 1998b, 1998c), showing the following trends: (i) slenderizing of the colonies (Toribio and Ovejero, 1997); (ii) decrease of interlamellar spacing (Toribio and Ovejero, 1998a); (iii) orientation in the direction of cold drawing (wire axis) of both the colonies (Toribio and Ovejero, 1998b) and the