Microstructures and mechanical properties of fiber textures forming mesoscale structure of drawn fine high carbon steel wire

Gondo, Shiori; Tanemura, Rena; Suzuki, Shinsuke; Kajino, Satoshi; Asakawa, Mitsuhiko; Takemoto, Kosuke; Tashima, Kenichi

doi:10.1016/j.msea.2018.11.121

Cited by 14 publications

(8 citation statements)

References 18 publications

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“…The distances between O and A and between A and B are referred to as w and h, respectively. Therefore, 'shear strain measured from SEM image γ' was calculated according to equation (4). In particular, 'shear strain measured from the SEM image at the fractured point γ f ' was calculated in accord with equation 5by drawing the straight lines l Af , l Bf , l Cf , l Df , and l Ef , as shown in Fig.…”

Section: Calculation Of Shear Strain From Sem Imagementioning

confidence: 99%

“…However, the wires in this study could be drawn without rapturing. The significant value of variation of tensile strength, uniform elongation, and reduction of area were not observed [2][3][4][5]. Thus, it is interpreted that external factors mainly caused non-uniform shear strain distribution.…”

Section: Evaluation Of the Potential Maximum Shear Strainmentioning

confidence: 99%

“…The evaluation of ductility is vital because the decrease in ductility is problematic when drawing the wire to make a finer and stronger wire. The authors have studied the wire-drawing method to improve the ductility of drawn high carbon steel wires [2][3][4] and established a simple and reliable method of measuring the ductility of a fine metal wire, acquired from tensile testing [5]. However, the ductility is also evaluated by the torsion testing method because metal wires are often used to be twisted.…”

Section: Introductionmentioning

confidence: 99%

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Method for Evaluating Potential Maximum Shear Strain for a Fine Metal Wire in Torsion Testing

et al. 2020

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The torsion number of drawn fine high carbon steel wires was measured through torsion testing. The angles between the scratches on the tested wire surface and its longitudinal axis were measured. The shear strain calculated from torsion number γt, shear strain at fractured point γf, and plastic shear strain γpc were evaluated. The following results were obtained. First, the shear strain distribution homogenized; further, torsion number per unit length N, γt, and γpc increased when decreasing the difference between γf and γpc where γpc subtracted from γf (=Δγfpc) > 0. Second, the external factors caused non-uniform shear strain distribution and reduction from the potential maximum shear strain, even for the wire that was hardly affected by the internal factors. The difference of shear strain non-uniformity caused a variation in reduction from the potential maximum shear strain. The internal factors included non-uniform microstructure and existence of inclusions and voids. The external factors were caused by the testing machine and setting of the sample. The potential maximum shear strain was obtained when the effects of internal and external factors were inhibited. Finally, two evaluation methods of the potential maximum shear strain were suggested. One method identifies a sample with a small Δγfpc, and a large γpc where Δγfpc > 0. This sample can be regarded as having the closest strain to the potential maximum shear strain. The other method determines γpc when Δγfpc is closest to 0. This value can be interpreted as plastic strain of the potential maximum shear strain.

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Section: Calculation Of Shear Strain From Sem Imagementioning

confidence: 99%

Section: Evaluation Of the Potential Maximum Shear Strainmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Method for Evaluating Potential Maximum Shear Strain for a Fine Metal Wire in Torsion Testing

et al. 2020

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“…The occurrence of delamination, known as the longitudinal splitting along the wire axis, is one of the qualitative indications of bad ductility. There have been a number of works [15][16][17][18][19][20][21] on the occurrence of delamination in conjunction with the development of texture, the formation of tensile residual stress on the wire surface, the partial decomposition of cementite, and drawing conditions. To prevent the occurrence of delamination, many works about improving ductility and drawability of cold drawn wires by changing manufacturing conditions, such as the modification of pass schedule [22], the control of galvanized coating layer structure [23], and the adoption of a fast heating treatment by using electro-pulsing [24,25], have been reported.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, NT in a torsion test would become a good parameter to examine torsional ductility of cold drawn steel wires. However, most research [15][16][17][18][19] has focused on the effects of manufacturing conditions and microstructures on the occurrence of delamination. Even in a few works providing the variations of NT with drawing or galvanizing conditions, the role of NT data was an indicator of the specific drawing strain or annealing conditions, where delamination occurred in cold drawn and annealed steel wires [26,27].…”

Section: Introductionmentioning

confidence: 99%

Effects of Wire Drawing and Annealing Conditions on Torsional Ductility of Cold Drawn and Annealed Hyper-Eutectoid Steel Wires

Jung

Park³

et al. 2020

Metals

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The effects of microstructural features on torsional ductility of cold drawn and annealed hyper-eutectoid steel wires were investigated. The patented wire rods were successively dry drawn to ε = 0.79 (54.7%) ~ 2.38 (90.7%). To examine the effects of hot-dip galvanizing conditions on torsional ductility, steel wires with ε = 1.95 were annealed at 500 °C for 30 s for ~1 h in a salt bath. In cold drawn wires, the number of turns to failure increased steadily, showing the maximum peak, and then decreased with drawing strain. During the post-deformation annealing at 500 °C, torsional ductility of steel wires decreased with annealing time, except for the rapid drop due to the occurrence of delamination for 10 s annealing. The decrease of the number of turns to failure would be attributed to the microstructural evolutions, accompanying the spheroidization and growth of cementite particles and the recovery of ferrite in cold drawn steel wires. From the relationship between microstructural evolution and torsional ductility, it was found that among microstructural features, the shape and orientation of lamellar cementite showed the significant effect on torsional ductility of cold drawn and annealed hyper-eutectoid steel wires.

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Dependence of Mesoscale Structure of Drawn High-Carbon Steel Wire on Wire Diameter

et al. 2021

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Microstructures and mechanical properties of fiber textures forming mesoscale structure of drawn fine high carbon steel wire

Cited by 14 publications

References 18 publications

Method for Evaluating Potential Maximum Shear Strain for a Fine Metal Wire in Torsion Testing

Method for Evaluating Potential Maximum Shear Strain for a Fine Metal Wire in Torsion Testing

Effects of Wire Drawing and Annealing Conditions on Torsional Ductility of Cold Drawn and Annealed Hyper-Eutectoid Steel Wires

Dependence of Mesoscale Structure of Drawn High-Carbon Steel Wire on Wire Diameter

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