PSI - Issue 37

Jesús Toribio et al. / Procedia Structural Integrity 37 (2022) 1007–1012 Jesús Toribio / Procedia Structural Integrity 00 (2021) 000 – 000

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4. Conclusions In this article an exhaustive analysis was performed on the evolution of the micro-damages caused by the cold drawing process itself in the colonies and lamellae of the pearlitic microstructure. Both the sinuous curvatures generated in the cementite lamellae that are not oriented in favor of the drawing direction, pseudocolonies, and the fragmentation of the cementite lamellae present in all types of pearlitic colonies are a key fact in the evolution of the pearlitic microstructure and its micro-defects, since as the drawing process progresses, the aforesaid micro-defects increase noticeably. The analysis of the micro-damages produced by cold drawing, as well as their evolution, is key to understanding the choice of fracture paths during the breaking process of these steels. The evolution from micro-decolonization to intercolonial tearing, as the cold drawing process progresses, produces areas of discontinuity in the pearlitic matrix and preferential places for the progression of the fracture. References Dollar, M.; Bernstein, J. M.; Thompson, A. W., 1998. Influence of Deformation Substructure on Flow and Fracture of Fully Pearlitic Steel. Acta Metallurgica 36, 311-320. Park, Y.J., Bernstein, I.M., 1979. The Process of Crack Initiation and Effective Grain Size for Cleavage Fracture in Pearlitic Eutectoid Steel. Metallurgical Transactions 10A, 1653 – 1664. Toribio, J., Ayaso, F.J., 2003. Anisotropic Fracture Behavior of Cold Drawn Steel: A Materials Science Approach. Materials Science and Engineering A343, 265-272. 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. Microstructure Orientation in a Pearlitic Steel Subjected to Progressive Plastic Deformation. Journal of Materials Science Letters 17, 1037-1040. Toribio, J., Ovejero, E., 1998b. Effect of Cumulative Cold Drawing on the Pearlite Interlamellar Spacing in Eutectoid Steel. Scripta Materialia 39, 323-328. 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.