Evolution of non-metallic inclusions with cold drawing in progressively cold drawn eutectoid pearlitic steel wires

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.

Download Full-text

Cementite Decomposition of Pearlitic Steels during Cold Drawing

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.26-28.45 ◽

2007 ◽

Vol 26-28 ◽

pp. 45-50 ◽

Cited By ~ 3

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.

Download Full-text

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

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1016.413 ◽

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.

Download Full-text

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.629.192 ◽

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.

Download Full-text

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

Metals ◽

10.3390/met11060962 ◽

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.

Download Full-text

Fracture behaviour of high-strength cold-drawn pearlitic steel wires: The role of non-metallic inclusions

Procedia Structural Integrity ◽

10.1016/j.prostr.2021.10.136 ◽

2021 ◽

Vol 33 ◽

pp. 1203-1208

Author(s):

Jesús Toribio ◽

Francisco-Javier Ayaso ◽

Beatriz González ◽

Rocío Rodríguez

Keyword(s):

Fracture Behaviour ◽

High Strength ◽

Pearlitic Steel ◽

Steel Wires ◽

Metallic Inclusions

Download Full-text

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

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.754.131 ◽

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).

Download Full-text