Abstract
This paper deals with the influence of the cold drawing process on the fracture behaviour of pearlitic steels. To this end, fracture tests under axial loading were performed on steel wires with different drawing degree (from a hot rolled bar to a commercial prestressing steel wire), transversely pre-cracked by fatigue, analyzing in detail the changes in fracture micromechanisms. The deflection angles of the fracture path were measured by longitudinal metallographic sections and the characteristic parameters of the loaddisplacement plot were related to different fracture events. Results allowed a calculation of critical stress intensity factors for different fracture angles and drawing degrees, thus evaluating the strength anisotropy and obtaining a sort of directional toughness.
Highlights
The micro-mechanisms taking place during the fracture process of metals and alloys, as well as the fracture toughness, change with the temperature, the loading rate, and the cold work [1,2,3]
This paper deals with the anisotropic fracture behaviour of eutectoid pearlitic steel wires with different degree of cold drawing exhibiting strength anisotropy
C old drawing is an effective process for increasing the strength of pearlitic steel, resulting in a considerable improvement in the matter of fracture behaviour while at the same time a strong anisotropy appears during fracture, it being related to microstructural anisotropy produced by plastic deformation as a consequence of cold drawing
Summary
The micro-mechanisms taking place during the fracture process of metals and alloys, as well as the fracture toughness, change with the temperature, the loading rate, and the cold work [1,2,3]. In the particular case of pearlitic steel used to produce high-strength cold-drawn prestressing wires, the cold drawing process affects the phenomenon of the fracture, so that the most heavily drawn steels (undergoing severe plastic deformation) exhibit strength anisotropy, and a change in the crack propagation direction, which approaches the wire axis or drawing direction [4] This leads to the calculation of two values of the angular fracture toughness, one in the radial direction and the other in the axial one, the first being much greater than the second for steels with severe plastic deformation [5,6,7]. The analysis is focused on the crack path deflection angle and the directional toughness
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