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Metals 2019, 9(2), 224;

Influence of Mechanical Anisotropy on Micro-Voids and Ductile Fracture Onset and Evolution in High-Strength Low Alloyed Steels

Rina Consulting—Centro Sviluppo Materiali S.p.A, Via di Castel Romano 100, 00128 Roma, Italy
Department of Mechanical and Aerospace Engineering, Sapienza University of Rome, via Eudossiana 18, 00184 Roma, Italy
Dipartimento di Ingegneria, Università di Perugia, 06125 Perugia, Italy
Author to whom correspondence should be addressed.
Received: 20 December 2018 / Revised: 4 February 2019 / Accepted: 12 February 2019 / Published: 13 February 2019
(This article belongs to the Special Issue High-Strength Low-Alloy Steels)
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In this paper results of a wide and innovative mechanical assessment, that was performed on large diameter spiral line pipes for gas transportation, are reported. The anisotropic material hardening has been characterized by tensile (smooth and notched specimens), torsion, and compression tests. Tests were performed in the pipe of the pipe with specimens machined along several orientations, taking into account the pipe through thickness direction. The influence of different triaxiality stress states on anisotropic behavior of the material have also been analyzed by means of tensile tests on notched specimens. After the experiments, the material was assessed by measuring the void distribution on the material as is, and on many deformed and fractured specimens, including tensile tests at different triaxiality, and torsion tests. The results showed that in such a class of materials, the experimental void fraction is fully negligible and not related to the applied plastic strain, even at the fracture proximity. As a consequence it can be concluded that, the plastic softening hypothesis may be dropped and damage due to void evolution hypothesis is not adequate. View Full-Text
Keywords: mechanics; microstructure; fracture; anisotropy mechanics; microstructure; fracture; anisotropy

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Iob, F.; Cortese, L.; Di Schino, A.; Coppola, T. Influence of Mechanical Anisotropy on Micro-Voids and Ductile Fracture Onset and Evolution in High-Strength Low Alloyed Steels. Metals 2019, 9, 224.

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