Effect of cold drawing on susceptibility to hydrogen embrittlement of prestressing steel

1993 ◽  
Vol 26 (1) ◽  
pp. 30-37 ◽  
Author(s):  
J. Toribio ◽  
A. M. Lancha
Keyword(s):  
Hydrogen Embrittlement ◽  
Cold Drawing ◽  
Prestressing Steel

On the Role of Double Die Angle on the Hydrogen Embrittlement of Cold Drawn Prestressing Steel Wires

2015 ◽  
Vol 665 ◽  
pp. 245-248
Author(s):  
Jesús Toribio ◽  
Miguel Lorenzo ◽  
Diego Vergara
Keyword(s):  
Residual Stress ◽  
Hydrogen Embrittlement ◽  
Plastic Strain ◽  
Strain State ◽  
Cold Drawing ◽  
Stress Generation ◽  
Prestressing Steel ◽  
Residual Stress State ◽  
Drawing Die ◽  
Steel Wires

Residual stresses produced by cold drawing are an undesirable effect of the non-uniform plastic strain distribution generated during the conforming process used for obtaining prestressing steel wires. Among the diverse parameters of the process influencing the residual stress generation, one of the most relevant is the geometry of the drawing die and, in particular, the inlet die angle. Wires drawn with die angles as low as possible will exhibit a lower and more homogeneous plastic strain state and, therefore, a smaller and more uniform residual stress state. Thus, the hydrogen embrittlement (HE) susceptibility of such wires is also lower, thereby enlarging the life in service of these components. In this paper an innovative design of the drawing die is proposed using two consecutive angles (i.e.,varying die angle) for reducing the residual stress-strain state in the cold drawn wires and, consequently, for improving the resistance to HE of prestressing steel wires.

Influence of Drawing Straining Path on Hydrogen Damage of Prestressing Steel Wires

2011 ◽  
Vol 488-489 ◽  
pp. 775-778 ◽  
Author(s):  
Jesús Toribio ◽  
Miguel Lorenzo ◽  
Diego Vergara
Keyword(s):  
Residual Stress ◽  
Hydrogen Embrittlement ◽  
Plastic Strain ◽  
Strain Distribution ◽  
Cold Drawing ◽  
Stress And Strain ◽  
Prestressing Steel ◽  
Hydrogen Damage ◽  
Steel Wires ◽  
Hydrogen Accumulation

Residual stress and strain states, produced during cold drawing, play a key role in hydrogen embrittlement (HE) of prestressing steel wires, because of hydrogen accumulation in certain places of the material is affected by stress and strains fields. Taking into account that thedrawingstraining path directly affectsbothresidual stress and plastic strain distribution, the aim of the present paper is to clarify the influence of drawing straining path in the residual state and, consequently, its influence on the HE process of prestressing steel wires.

Susceptibility of hydrogen embrittlement of Al-alloy circular bars submitted to cold drawing

2021 ◽  
Author(s):  
Frederico Tavares ◽  
diego silva ◽  
Carlos Trivellato de Carvalho Filho ◽  
Pedro Brito
Keyword(s):  
Hydrogen Embrittlement ◽  
Cold Drawing ◽  
Al Alloy

Influence of residual stresses and strains generated by cold drawing on hydrogen embrittlement of prestressing steels

2007 ◽  
Vol 49 (9) ◽  
pp. 3557-3569 ◽  
Author(s):  
J. Toribio ◽  
V. Kharin ◽  
D. Vergara ◽  
J.A. Blanco ◽  
J.G. Ballesteros
Keyword(s):  
Hydrogen Embrittlement ◽  
Residual Stresses ◽  
Cold Drawing ◽  
Residual Stresses And Strains

Hydrogen Embrittlement of Prestressing Steel.

1996 ◽  
pp. 131-140 ◽  
Author(s):  
Kouji Ishii ◽  
Hiroshi Seki ◽  
Tsutomu Fukute ◽  
Kazuhiro Ikawa ◽  
Naoyuki Sugihashi
Keyword(s):  
Hydrogen Embrittlement ◽  
Prestressing Steel

scholarly journals Cleavage Stress Producing Notch-Induced Anisotropic Fracture and Crack Path Deflection in Cold Drawn Pearlitic Steel

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 451
Author(s):  
Jesús Toribio ◽  
Francisco-Javier Ayaso
Keyword(s):  
Fracture Behavior ◽  
Materials Science ◽  
Crack Path ◽  
Steel Wire ◽  
Cold Drawing ◽  
Pearlitic Steel ◽  
Element Analysis ◽  
Prestressing Steel ◽  
Anisotropic Fracture ◽  
Hot Rolled

The fracture performance of axisymmetric notched samples taken from pearlitic steels with different levels of cold-drawing is studied. To this end, a real manufacture chain was stopped in the course of the process (on-site in the factory), and samples of all intermediate stages were extracted from the initial hot-rolled bar (not cold-drawn at all) to the final commercial product (prestressing steel wire). Thus, the drawing intensity or straining level (represented by the yield strength) is treated as the key variable to elucidate the consequences of manufacturing on the posterior fracture issues. On the basis of a materials science approach, the clearly anisotropic fracture behavior of heavily drawn steels (exhibiting deflection in the fracture surface) is rationalized on the basis of the markedly oriented pearlitic microstructure of the cold-drawn steel that influences the operative micromechanism of fracture. In addition, a finite element analysis of the stress distribution at the fracture instant allows the computation of the cleavage annular stress required to produce anisotropic fracture behavior and thus crack path deflection associated with mixed-mode cracking. Results show that such a stress is the variable governing initiation and propagation of anisotropic fracture by cleavage (a specially oriented and enlarged cleavage fracture) appearing along the wire axis direction in the case of sharply-notched samples of heavily drawn pearlitic steels.

scholarly journals Role of Non-Metallic Inclusions in the Fracture Behavior of Cold Drawn Pearlitic Steel

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 962
Author(s):  
Jesús Toribio ◽  
Francisco-Javier Ayaso ◽  
Beatriz González
Keyword(s):  
Fracture Behavior ◽  
Steel Wire ◽  
Cold Drawing ◽  
Pearlitic Steel ◽  
Scientific Work ◽  
Prestressing Steel ◽  
Metallic Inclusions ◽  
Relevant Role ◽  
Hot Rolled

In this paper an exhaustive scientific work is performed, by means of metallographic and scanning electron microscope (SEM) techniques, of the microstructural defects exhibited by pearlitic steels and their evolution with the manufacturing process by cold drawing, analyzing the consequences of such defects on the isotropic/anisotropic fracture behavior of the different steels. Thus, the objective is the establishment of a relation between the microstructural damage and the fracture behavior of the different steels. To this end, samples were taken from all the intermediate stages of the real cold drawing process, from the initial hot rolled bar (not cold drawn at all) to the heavily drawn final commercial product (prestressing steel wire). Results show the very relevant role of non-metallic inclusions in the fracture behavior of cold drawn pearlitic steels.

Anisotropic Fatigue & Fracture Behaviour in Hot-Rolled and Cold-Drawn Pearlitic Steel Wires

2016 ◽  
Vol 713 ◽  
pp. 103-106 ◽  
Author(s):  
Jesús Toribio ◽  
Beatriz González ◽  
Juan Carlos Matos
Keyword(s):  
Mixed Mode ◽  
Fracture Behaviour ◽  
Steel Wire ◽  
Cold Drawing ◽  
Pearlitic Steel ◽  
Mode I ◽  
Prestressing Steel ◽  
Wire Fatigue ◽  
Hot Rolled

This paper analyses the role of cold drawing in the fatigue and fracture behaviour of pearlitic steels with distinct drawing degree (a hot rolled bar and a commercial prestressing steel wire). Fatigue crack growth develops globally in mode I and locally in mixed mode in both steels, the micro-crack deflection angle depending on the drawing degree. With regard to fracture behaviour, it takes place in mode I in the hot-rolled bar and in mixed mode (with a strong component of mode II) in the case of the cold-drawn wire, so that strength anisotropy appears in the drawn steel and a sort of directional toughness can be defined.

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