PSI - Issue 81

Jesús Toribio et al. / Procedia Structural Integrity 81 (2026) 95–97

97

D

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HEDE

D

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D

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Fig. 2. Micromechanism of HAC/HE: hydrogen diffusion in longitudinal and transverse directions and fracture by hydrogen enhanced delamination (HEDE).

6. Conclusion Heavily cold drawn pearlitic steels exhibit anisotropy of hydrogen assisted cracking/hydrogen embrittlement (HAC/HE) behaviour , and there is a strong correlation between the microstructural orientation angles (at the two levels of the pearlitic colonies and lamellae) and the macroscopic crack deflection angles (representing the macroscopic crack paths), clearly demonstrating the influence of the oriented microstructure (and thus of the manufacture process by increasing cold drawing) on the macroscopic HAC/HE behaviour of the steels, towards the weakest crack path . 7. Epilogue: A Tribute to Andrea Mantegna Heavily cold-drawn pearlitic steel wires exhibit in their crack path evidence of strongly anisotropic behavior with a marked deflection/deviation angle of 90º. This resembles Mantegna’s Dead Christ Perspective (MDCP) painting with its relevant and innovative change of point of view in the description of the Dead Christ (90º rotated from the traditional perspectives) and the body axis perpendicular to the canvas ( foreshortening perspective ), see Fig. 3.

Fig. 3. Andrea Mantegna: Dead Christ .

References Cherry, B.W., Price, S.M., 1980. Pitting, Crevice and Stress Corrosion Cracking Studies of Cold Drawn Eutectoid Steels, Corrosion Science 20, 1163 - 1184. Sarafianos, N., 1989. Environmentally Assisted Stress - Corrosion Cracking of High - Strength Carbon Steel Patented Wire, Journal of Materials Science Letters 8, 1486 - 1488. Toribio, J., Ovejero, E., 1997. Microstructure Evolution in a Pearlitic Steel Subjected to Progressive Plastic Deformation. Materials Science and Engineering A234 - 236, 579 - 582. Toribio, J., Ovejero, E., 1998a. Effect of Cumulative Cold Drawing on the Pearlite Interlamellar Spacing in Eutectoid Steel. Scripta Materialia 39, 323 - 328. Toribio, J., Ovejero, E., 1998b. Microstructure Orientation in a Pearlitic Steel Subjected to Progressive Plastic Deformation. Journal of Materials Science Letters 17, 1037 - 1040. Toribio, J., Ovejero, E., 1998c. Effect of Cold Drawing on Microstructure and Corrosion Performance of High - Strength Steel. Mechanics of Time - Dependent Materials 1, 307 - 319. Toribio, J., Ovejero, E., Toledano, M., 1997. Microstructural Bases of Anisotropic Fracture Behaviour of Heavily Drawn Steel. International Journal of Fracture 87, L83-L88.