Deformation Behavior under Tension with Pulse Current of Ultrafine-Grain and Coarse-Grain CP Titanium

Stolyarov, V. V.; Korolkov, Oleg; Pesin, Alexander; Raab, G. I.

doi:10.3390/ma16010191

Cited by 6 publications

(5 citation statements)

References 11 publications

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“…For a wide range of duty cycles, it was shown that pulsed current during the tension of CG titanium can lead not only to traditional softening but also to hardening [ 21 ]. However, with a low-duty cycle in both types of titanium, only a decrease in flow stresses occurred [ 22 ].…”

Section: Methods Of Current Introductionmentioning

confidence: 99%

“…Accordingly, a decrease in the duty cycle up to Q = 1 means the action of a multi-pulse current, which should contribute to an increase in the deformation temperature from room to high. Studies on the effect of pulse-current duty cycle on EPE are extremely rare and are devoted to applied issues of application to high-speed rolling [20] or to the EPE dependence under tension in coarse-grained (CG) and ultrafine-grained (UFG) titanium [21,22]. For a wide range of duty cycles, it was shown that pulsed current during the tension of CG titanium can lead not only to traditional softening but also to hardening [21].…”

Section: Methods Of Current Introductionmentioning

confidence: 99%

“…As mentioned earlier, the pulse-current duty cycle, as one of the important parameters, is emerging in EPE research [ 21 , 22 , 34 ]. Figure 8 shows the stress–strain curves of aluminum bronze under the current of different duty cycles and densities.…”

Section: Deformation Behaviormentioning

confidence: 99%

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A Pulsed Current Application to the Deformation Processing of Materials

Stolyarov,

Misochenko

2023

Materials

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A review of studies on the electroplastic effect on the deformation process in various conductive materials and alloys for the last decade has been carried out. Aspects, such as the mode and regimes of electric current, the practical methods of its introduction into materials with different deformation schemes, features of deformation behavior accompanied by a pulsed current of different materials, structural changes caused by the combined action of deformation and current, the influence of structural features on the electroplastic effect, changes in the physical, mechanical, and technological properties of materials subjected to plastic deformation under current, possible mechanisms and methods of physical and computer modeling of the electroplastic effect, and potential and practical applications of the electroplastic effect are considered. The growing research interest in the manifestation of the electroplastic effect in such new modern materials as shape-memory alloys and ultrafine-grained and nanostructured alloys is shown. Various methods of modeling the mechanisms of electroplasticity, especially at the microlevel, are becoming the most realistic approach for the prediction of the deformation behavior and physical and mechanical properties of various materials. Original examples of the practical application of electropulse methods in the processes of drawing, microstamping, and others are given.

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Section: Methods Of Current Introductionmentioning

confidence: 99%

Section: Methods Of Current Introductionmentioning

confidence: 99%

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A Pulsed Current Application to the Deformation Processing of Materials

Stolyarov,

Misochenko

2023

Materials

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“…The ratio of thermal and EPE is significantly affected by the percentage of grain boundaries of different grain sizes and the defect density present during the application of current. Stolyarov et al [65] investigated the influence of current duty cycle to the microstructure, microhardness, and tensile deformation behavior of coarse crystalline (CG) and ultra-fine crystalline (UFG) titanium by varying the current density and the pulse duration. Under the action of low duty cycle pulse current, the flow stress of CG and UFG titanium decreases with the change of current density and duration and the reduction of flow stress of CG titanium is lower than that of UFG titanium.…”

Section: Influence Factors Of Electrical Pulse On Metalmentioning

confidence: 99%

Effects of electrical pulse on metal deformation behaviors

Huang,

Yang,

Xing

et al. 2024

Mater. Res. Express

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As a kind of special energy field assisted plastic forming, electric pulse assisted plastic forming combines multiple physical fields, such as thermal, electrical, magnetic and mechanical effects, has multiple effects on metal. It has a good industrial application prospect in the fields of directional microstructure regulation of materials and preparation of new materials. The flow stress of metal materials can be effectively reduced by electro-pulse assisted forming. The action mechanism of pulse current includes thermodynamics (Joule heating effect) and kinetic (pure electro-plastic effect or athermal effect). Thermodynamically, electric pulses can be used to provide the energy for dislocation migration and atomic diffusion, and aid in microstructure changes such as recrystallization, phase transition and microcrack healing of metals. In terms of dynamics, electric pulse has an effect on the speed and path of dislocation structure evolution. On this basis, a series of theoretical models for accurately predicting the flow stress of materials in electrically assisted forming process were formulated by combining the stress-strain constitutive relationship considering the temperature rise effect and the pure electro-plastic effect. The accuracy of the predicting model is greatly enhanced by the introduction of electrical parameters. The mechanism for electrically assisted forming was further revealed.

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“…In many cases, previous work has shown that electrically assisted forming has resulted in metals being formed further than conventional forming methods alone without sacrificing strength or ductility. The contribution in the flow stress reduction from heating by an external source was less than that from tension with pulse current at the same temperatures [15,16]. Mohammadtabar et al [17] focused on the effect of the electric current pulse type on the springback, microstructure, texture, and mechanical properties during the V-bending process of the AA2024 aluminum alloy.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Current Intensity and Feed Speed in Electrically Assisted Necking and Thickening of 5A02 Aluminum Alloy Tubes

Fan,

Xu,

Tao

et al. 2024

Materials

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In order to further explore the forming limits of thin-wall tube necking and thickening, and obtain sufficient thickness of the tube in the thickening area, local electric pulse-assisted forming experiments were carried out to study the effects of current intensity and feed speed on the necking and thickening forming of thin-wall tube. The experimental results show that with the increase in current intensity, the temperature in the forming area of the tube increases, and the forming load for necking and thickening decreases. However, with the increase in feed speed, the overall forming load for necking and thickening increases in general, and the smaller feed speed is more conducive to forming. Taking into account the forming efficiency and electrode loss, the corresponding forming process window is obtained for the manufacturing of good parts. That is, during the necking stage, the current intensity shall not be less than 300 A, and the feed speed shall not exceed 10 mm/min. During the thickening stage, the current intensity should not be less than 1400 A, and the feed speed should not exceed 1 mm/min. The target part is finally formed, with an average wall thickness of 5.984 mm in the thickening zone and a thickening rate of 303.2%.

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Deformation Behavior under Tension with Pulse Current of Ultrafine-Grain and Coarse-Grain CP Titanium

Cited by 6 publications

References 11 publications

A Pulsed Current Application to the Deformation Processing of Materials

A Pulsed Current Application to the Deformation Processing of Materials

Effects of electrical pulse on metal deformation behaviors

Experimental Investigation of Current Intensity and Feed Speed in Electrically Assisted Necking and Thickening of 5A02 Aluminum Alloy Tubes

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