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).

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.

Atomic scale investigation of redistribution of alloying elements in pearlitic steel wires upon cold-drawing and annealing

2013 ◽  
Vol 132 ◽  
pp. 233-238 ◽  
Author(s):  
Y.J. Li ◽  
P. Choi ◽  
S. Goto ◽  
C. Borchers ◽  
D. Raabe ◽  
...  
Keyword(s):  
Cold Drawing ◽  
Pearlitic Steel ◽  
Atomic Scale ◽  
Alloying Elements ◽  
Steel Wires

Cold-Drawn Pearlitic Steels as Hierarchically Structured Materials: An Approach to Johann Sebastian Bach

2018 ◽  
Vol 774 ◽  
pp. 492-497 ◽  
Author(s):  
Jesús Toribio
Keyword(s):  
Level Structure ◽  
Cold Drawing ◽  
Pearlitic Steel ◽  
Johann Sebastian Bach ◽  
Structured Materials ◽  
Hierarchical Microstructure ◽  
Steel Wires ◽  
Manufacture Process ◽  
Microstructural Integrity ◽  
Assisted Fracture

This paper analyzes the hierarchical microstructure of cold-drawn pearlitic steels. To this end, environmentally assisted fracture behavior and microstructural integrity in aggressive environments is analyzed in progressively cold-drawn pearlitic steels based on their microstructural evolution during the multi-step cold drawing manufacture process producing a slenderizing and orientation of the pearlitic colonies (first microstructural level), and orientation and densification of the ferrite/cementite lamellae (second microstructural level). Thus the microstructure of the cold-drawn pearlitic steel wires becomes progressively oriented as the cold-drawing degree increases and this microstructural fact affects their macroscopic behavior, inducing anisotropic fracture behavior and crack path deflection in aggressive environments. In addition, the hierarchical microstructure of cold-drawn pearlitic steel wires in two microstructural levels (colonies and lamellae) suggests a consideration of them as hierarchically structured materials (HSM). Furthermore, an analogy is established in the paper between the microstructural arrangement in cold-drawn pearlitic steels and the multi-level structure of Johann Sebastian Bach’s music.

Cementite Decomposition of Pearlitic Steels during Cold Drawing

2007 ◽  
Vol 26-28 ◽  
pp. 45-50 ◽  
Author(s):  
Juraj Balak ◽  
Xavier Sauvage ◽  
Duk Lak Lee ◽  
Choong Yeol Lee ◽  
Philippe Pareige
Keyword(s):  
Dissolution Rate ◽  
Three Dimensional ◽  
Cold Drawing ◽  
Pearlitic Steel ◽  
Atom Probe ◽  
Ferrite Phase ◽  
Alloying Elements ◽  
Steel Wires

Microstructures of cold drawn pearlitic steel wires were investigated by three-dimensional atom probe (3D-AP) to understand the influence of alloying elements on the decomposition of cementite. Before cold drawing, Si is mostly located in the ferrite phase, while Cr is located in the Fe3C phase and the amount of Mn is similar in Fe3C and in ferrite. Higher Si amount leads to higher dissolution rate of cementite and Cr has a little effect on cementite decomposition during drawing.

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.

Effect of Thermal-Mechanical Treatment on Texture and Properties of Cold-Drawn Steel Wire

2012 ◽  
Vol 629 ◽  
pp. 192-197
Author(s):  
Fan Yang
Keyword(s):  
High Performance ◽  
Mechanical Treatment ◽  
Steel Wire ◽  
Local Stress ◽  
Cold Drawing ◽  
Pearlitic Steel ◽  
Fiber Texture ◽  
Optimum Process ◽  
Texture Characteristic ◽  
Steel Wires

Thermal–mechanical treatment is widely utilized by steelmakers to optimize the properties of high–strength cold drawing eutectoid steel wires. This paper presents the influence of industrial thermal–mechanical treatment utilized in practical manufacturing on microstructure and mechanical properties of drawn pearlitic steels. After post thermal–mechanical processing, drawn pearlitic steel features lower residual stress and improved yield/ultimate tensile strengths, and exhibits a more perfect fiber texture characteristic. Nevertheless, the torsion test of treated steel wire demonstrates that delamination occurs during torsional deformation, which implicates that the studied thermal–mechanical treatment is whereas not the optimum process for manufacturing the high–performance steel wires. The sequential TEM observation shows the remarkable different structure of pearlite lamellae in drawn and treated wires. The local stress concentration resulting from the separately granular cementite precipitation may attribute to the delamination of steel wire after post drawing.

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.

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