PSI - Issue 26

Jesús Toribio et al. / Procedia Structural Integrity 26 (2020) 348–353 Toribio / Structural Integrity Procedia 00 (2019) 000 – 000

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Fig. 3 (left) shows the shape evolution of pearlitic colonies (modelled as ellipsoids) by representing the evolution of the axis lengths of the elliptic section (2 a being the minor axis and 2 c the major axis), where a slenderising effect with cold drawing is very clear. Fig. 3 (right) plots the evolution of orientation angles  (related to the wire axis, see Fig. 2) in longitudinal section and the angle  in transverse section, showing a progressive orientation in the longitudinal section (and random effect in the transverse one).

Fig. 3. Shape evolution of pearlitic colonies (left) and orientation of them (right) in a direction quasi-parallel to the wire axis or cold drawing direction (represented by the vertical side of the micrographs in Fig. 1). In both plots D i represents the diameter of a wire with any degree of cold drawing and D 0 the initial wire diameter before cold drawing. Fig. 4 (left) shows the shape evolution of pearlitic lamellae (through the interlamellar spacing s i divided by the initial one before cold drawing s 0 = 0.0560  m), where a densification effect with cold drawing is very clear, small in the initial stages of cold drawing and more intense in the final stages of manufacturing. Fig. 4 (right) plots the evolution of orientation angles in longitudinal and in transverse section, showing a progressive orientation in the longitudinal section (and random effect in the transverse one).

Fig. 4. Shape evolution of ferrite/cementite lamellae (left) and orientation (right) of them in a direction quasi-parallel to the wire axis or cold drawing direction (represented by the vertical side of the micrographs in Fig. 1). In both plots D i represents the diameter of a wire with any degree of cold drawing and D 0 the initial wire diameter before cold drawing.