Effects of Process Conditions, Material Properties, and Initial Shape of Flaw on the Deformation Behavior of Surface Flaw during Wire Drawing

Hwang, Joong‐Ki

doi:10.2355/isijinternational.isijint-2019-196

Cited by 5 publications

(6 citation statements)

References 29 publications

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“…Based on the author's experience, 6) the deformation behavior of a surface flaw depends on the strain distribution along the transverse direction of a specimen. In addition, the shape change of the surface flaw at the free surface can be related to the amount of lateral spreading in a wire during the flat rolling process.…”

Section: Discussionmentioning

confidence: 99%

“…Meanwhile, the shape of the surface flaw was somewhat different with R h per pass. For example, a larger R h per pass led to a smaller d and larger w. It is well known that the surface flaw becomes sharp with increasing d and decreasing w, leading to a higher risk of fracture caused by the surface flaw, 6,9,14) especially in cold forming processes. Therefore, the r value is defined as the ratio of the depth and width of the surface flaw in this study.…”

Section: Validation Of Numerical Simulationmentioning

confidence: 99%

“…2,3) Recently, problems related to surface flaws have become one of the major issues in the steel wire, rod, and bar industries because of the increase in the strength of products. [4][5][6] This occurs because, as the strength of the product increases, the effect of surface defects on fractures in the product increases. Therefore, most steel producers measure the depth of surface flaws that occur in the production process and judge the pass or fail of the product based on the depth of the surface flaw.…”

Section: Introductionmentioning

confidence: 99%

“…7) Therefore, we need to understand the deformation behavior of surface flaws during downstream forming processes such as hot rolling, wire drawing, flat wire rolling, and forging. Several studies have been conducted regarding the deformation behavior of surface flaws during the hot rolling, 2,4,[8][9][10][11][12] wire drawing 6,[13][14][15][16] and forging processes. 17,18) However, no literature can be found concerning the deformation behavior of surface flaws during the flat wire rolling process although flat-rolled wires are used in many applications, such as windshield wipers, springs, guide rails, and saw blades.…”

Section: Introductionmentioning

confidence: 99%

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Deformation Behavior of Longitudinal Surface Flaws in Flat Rolling of Steel Wire

Hwang

2021

ISIJ Int.

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The deformation behavior of a longitudinal V-shaped surface flaw was investigated during the flat wire rolling process using finite element analysis. The effects of process conditions, material properties, and initial position of the flaw on the deformation behavior of surface flaws were evaluated to understand the deformation behavior of flaws and to find solutions to decrease flaws. The surface flaw, that is, the ratio of the depth and width of the surface flaw (r), decreased with increasing reduction in height per pass, roll diameter, and friction coefficient. Unfortunately, the surface flaw and strain homogeneity of the wire simultaneously decreased under similar process conditions. The surface flaw slightly decreased with the strain hardening exponent (n) by increasing the width of the surface flaw. However, the effect of n value on the deformation of the surface flaw was not crucial. Higher strain at the flat surface induced an overlap-type surface flaw, whereas a small strain in the free surface induced an open-type surface flaw during the flat wire rolling process, which means that the surface flaw on the flat surface was much more detrimental than the surface flaw on the free surface. The deformation behavior of the surface flaw in flat-rolled wire was highly related to the strain inhomogeneity and lateral spreading of the wire. As the strain inhomogeneity of the flat-rolled wire increased, the lateral spreading of the wire increased, resulting in a decrease in the surface flaw, i.e., the r value.

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Section: Discussionmentioning

confidence: 99%

Section: Validation Of Numerical Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Deformation Behavior of Longitudinal Surface Flaws in Flat Rolling of Steel Wire

Hwang

2021

ISIJ Int.

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“…Meanwhile, steel wire, rod, and bar manufacturing industries have suffered from the several surface defect problems during hot rolling process: surface flaw, decarburization, and abnormal grain growth [20,21]. On the basis of the author's experiences, these surface defects are strongly related to the uneven temperature distribution of the rod during the shape rolling process in comparison with the plate during the flat rolling process [1,22].…”

Section: Introductionmentioning

confidence: 99%

Thermal Behavior of a Rod during Hot Shape Rolling and Its Comparison with a Plate during Flat Rolling

Hwang¹

2020

Processes

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The thermal behavior of a rod during the hot shape rolling process was investigated using the off-line hot rolling simulator and numerical simulation. Additionally, it was compared with a plate during the flat rolling process to understand the thermal behavior of the rod during the hot rolling process in more detail. The temperature of the rod and plate during the hot rolling process was measured at several points with thermocouples using the rolling simulator, and then the measured temperature of each region of a workpiece was analyzed with numerical simulation. During hot rolling process, the temperature distribution of the rod was very different from the plate. The temperature deviation of the rod with area was much higher than that of the plate. The variation in effective stress of the rod along the circumferential direction can induce the temperature difference with area of the rod, whereas the plate had a relatively lower temperature deviation with area due to the uniform effective stress on the surface area. The heat generation by plastic deformation during the forming process also increased the temperature deviation of the rod with area, whereas strain distribution of the plate during flat rolling contributed to the uniformity of temperature of the plate with area. The higher temperature deviation of the rod along the circumferential and radial directions during the shape rolling process can increase the possibility of occurrence in surface defects compared to the plate during flat rolling.

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Wire Drawing Behaviors with Die Angle and Strain Hardening Rate of a Metal

Hwang

2024

J. of Materi Eng and Perform

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Effects of Process Conditions, Material Properties, and Initial Shape of Flaw on the Deformation Behavior of Surface Flaw during Wire Drawing

Cited by 5 publications

References 29 publications

Deformation Behavior of Longitudinal Surface Flaws in Flat Rolling of Steel Wire

Deformation Behavior of Longitudinal Surface Flaws in Flat Rolling of Steel Wire

Thermal Behavior of a Rod during Hot Shape Rolling and Its Comparison with a Plate during Flat Rolling

Wire Drawing Behaviors with Die Angle and Strain Hardening Rate of a Metal

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