scholarly journals Hydrogen embrittlement susceptibility of prestressing steel wires: the role of the cold-drawing conditions

2016 ◽  
Vol 2 ◽  
pp. 626-631 ◽  
Author(s):  
J. Toribio ◽  
M. Lorenzo ◽  
D. Vergara
Keyword(s):  
Hydrogen Embrittlement ◽  
Cold Drawing ◽  
Prestressing Steel ◽  
Steel Wires

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.

Delamination of Pearlitic Steel Wires: Role of Strain Partition on Mechanical Properties of Pearlitic Wires

2021 ◽  
Vol 1016 ◽  
pp. 413-417
Author(s):  
Akula Durga Vara Prasad ◽  
Subrata Mukherjee
Keyword(s):  
Steel Wire ◽  
Cold Drawing ◽  
Pearlitic Steel ◽  
Wire Drawing ◽  
Strain Partitioning ◽  
Strain Mode ◽  
Steel Wires ◽  
Torsional Properties ◽  
Multiple Stages

Cold drawn wires were produced by drawing the pearlitic wire rod (5.5 mm diameter). Cold drawing involved multiple stages to a final drawing strain of ≈ 2.5. The cold drawing alters the pearlite morphology. During the wire drawing, the change in morphology is location dependent. This will create the gradient in stain and strain mode between the surface and the center. This led to have a strain partition among ferrite and cementite phases. The strain partitioning plays a major role in the final tensile and torsional performance of the cod drawn wire. The present work dealt with the experimental and their numerical simulations of stress gradients and the role of pearlite morphology on tensile and torsional properties of the pearlitic steel wire.

scholarly journals The Role of Residual Stresses in the Performance and Durability of Prestressing Steel Wires

2012 ◽  
Vol 52 (7) ◽  
pp. 881-893 ◽  
Author(s):  
J. M. Atienza ◽  
J. Ruiz-Hervias ◽  
M. Elices
Keyword(s):  
Residual Stresses ◽  
Prestressing Steel ◽  
Steel Wires

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.

Hydrogen-Assisted Micro-Damage in Cold-Drawn Pearlitic Steels: Resembling Donatello Wooden Sculpture Texture

2017 ◽  
Vol 754 ◽  
pp. 131-134
Author(s):  
Jesús Toribio
Keyword(s):  
Hydrogen Embrittlement ◽  
Prestressed Concrete ◽  
Cold Drawing ◽  
Pearlitic Steel ◽  
Hydrogen Degradation ◽  
Hydrogen Damage ◽  
Steel Wires ◽  
Micro Level ◽  
Cumulative Plastic Strain ◽  
Hot Rolled

This paper deals with hydrogen embrittlement of cold-drawn pearlitic steel wires to be used in prestressed concrete structures in civil engineering. Special attention is given to the micro-level of hydrogen degradation, i.e, the hydrogen-assisted micro-damage (HAMD) that takes place in pearlitic steels in the form of the so-called tearing topography surface (TTS). It is shown that the appearance of this special topography evolves with the degree of cold drawing in the steels (level of cumulative plastic strain undergone by the wires) from standard TTS in hot rolled pearlitic steels (not cold-drawn at all) to a special hydrogen damage topography (HDT) consisting of a sort of enlarged and oriented TTS in heavily cold-drawn pearlitic steels (prestressing steel wires), thereby resembling Donatello wooden sculpture texture (DWST).

scholarly journals The Role of Overloading on the Reduction of Residual Stress by Cyclic Loading in Cold-Drawn Prestressing Steel Wires

2017 ◽  
Vol 7 (1) ◽  
pp. 84 ◽  
Author(s):  
Jesús Toribio ◽  
Miguel Lorenzo ◽  
Diego Vergara ◽  
Leticia Aguado
Keyword(s):  
Residual Stress ◽  
Cyclic Loading ◽  
Prestressing Steel ◽  
Steel Wires
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