PSI - Issue 59

Jesús Toribio et al. / Procedia Structural Integrity 59 (2024) 131–136 Jesús Toribio / Procedia Structural Integrity 00 ( 2024) 000 – 000

134

4

In the case of cold drawn pearlitic steels, the microstructural anisotropy makes the HAMD process develop by a HDT that evolves as a function of the drawing degree: HDT (i) , where i is the number of drawing steps undergone by each steel. For heavily drawn steels ( i ≥ 4), the HDT develops in the form of a sort of enlarged an oriented TTS (EOTTS), the enlargement and orientation being parallel to the wire axis or cold drawing direction, as analyzed by Toribio et al. (2004) and Toribio and Ovejero (2007). Fig. 3 (right) shows this special microscopic topography for a steel after 4 steps of cold drawing: HDT (4) in the form of EOTTS. 5. Classification of hydrogen assisted microdamage modes With regard to the HDT as TTS in hot-rolled or slightly drawn pearlitic steels (Fig. 3 left), it may be linked to the Michelangelo stone sculpture texture (MSST), cf. Fig. 4 for the Pietà di Firenze and the Pietá Rondanini .

Fig. 4. Works by Michelangelo: Pietà di Firenze and Pietà Rondanini .

In the matter of the HDT as EOTTS in heavily drawn pearlitic steels (Fig. 3 right), it resembles the Donatello wooden sculpture texture (DWST) shown in Fig. 5 for the Penitent Magdalene and the Saint John the Baptist .

Fig. 5. Works by Donatello: Penitent Magdalene and Saint John the Baptist .