Improved ductility of Fe-6.5 wt%Si alloy under electropulsing tension

Han, Chaoyu; Ye, Feng; Du, Haoyang; Liu, Binbin; Liang, Yongfeng; Li, Hui; Li, Hualong

doi:10.1016/j.msea.2022.143639

Cited by 10 publications

(4 citation statements)

References 55 publications

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“…At the same time, the pulsed current can promote the formation of deformation twins in the rolled samples, but this has little strengthening effect. For the dislocation density of samples rolled under a pulsed current, pulsed current promotes sample softening at elevated temperature, enhances dislocation activity, frees dislocations from relatively weak constraints, and promotes dislocation motion [44]. Additionally, the pulsed current induces free electron drift, and the drifting electrons generate an additional thrust on dislocations, helping dislocations overcome obstacles, releasing dislocation entanglement, reducing the proliferation of dislocations, and promoting dislocation cancellation and rearrangement [45].…”

Section: Discussionmentioning

confidence: 99%

Pulsed current-assisted twelve-roll precision rolling deformation of SUS304 ultra-thin strips with exceptional mechanical properties

Fan,

Wang,

Hou

et al. 2024

Int. J. Extrem. Manuf.

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Innovative pulsed current-assisted multi-pass rolling tests were conducted on a twelve-roll mill during the rolling deformation processing of SUS304 ultra-thin strips. The results show that in the first rolling pass, the rolling reduction rate of a conventionally rolled sample (at room temperature) is 33.8%, which can be increased to 41.5% by pulsed current-assisted rolling, enabling the formation of an ultra-thin strip with a size of 67.3 μm in only one rolling pass. After three passes of pulsed current-assisted rolling, the thickness of the ultra-thin strip can be further reduced to 51.7 μm. To clearly compare the effects of a pulsed current on the microstructure and mechanical response of the ultra-thin strip, ultra-thin strips with nearly the same thickness reduction were analyzed. It was found that pulsed current can reduce the degree of work-hardening of the rolled samples by promoting dislocation detachment, reducing the density of stacking faults, inhibiting martensitic phase transformation, and shortening the total length of grain boundaries. As a result, the ductility of ultra-thin strips can be effectively restored to approximately 16.3% while maintaining a high tensile strength of 1118 MPa. Therefore, pulsed current-assisted rolling deformation shows great potential for the formation of ultra-thin strips with a combination of high strength and ductility.

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Section: Discussionmentioning

confidence: 99%

Pulsed current-assisted twelve-roll precision rolling deformation of SUS304 ultra-thin strips with exceptional mechanical properties

Fan,

Wang,

Hou

et al. 2024

Int. J. Extrem. Manuf.

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“…Current can not only affect the growth of intermetallic compounds, but also improve their plastic deformation ability. Han et al [69] studied the EPE of Fe-6.5 wt%Si with an intermetallic ordered phase, and eliminated the influence of thermal effect by reducing the temperature variation of the sample through air cooling. The electrical pulse significantly increases the dislocation mobility, which further decreases the yield strength and increases the elongation accordingly.…”

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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“…Contemporary findings indicate that the Joule heating phenomenon can lower the barrier to dislocation motion and enhance the process of dislocation cancellation, consequently decreasing dislocation concentration [67][68][69][70]. Typically, the grid resistance, known as the Peierls-Nabarro force due to the periodically distributed Peierls energy of activation, is the barrier that must be overcome for the dislocation to slip [71][72][73].…”

Section: Joule Heat Effectmentioning

confidence: 99%

Mechanism of Electropulsing Treatment Technology for Flow Stress of Metal Material: A Review

Lu,

Tang,

et al. 2024

Alloys

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Residual stress is caused by non–uniform deformation caused by non–uniform force, heat and composition, which is of great significance in engineering applications. It is assumed that the residual stress is always the upper limit of the elastic limit, so the reduction of the flow stress will reduce the residual elastic stress. It is particularly important to control the flow stress in metal materials. Compared with traditional methods, the use of electropulsing treatment (EPT) technology stands out due to its energy–efficient, highly effective, straightforward and pollution–free characteristics. However, there are different opinions about the mechanism of reducing flow stress through EPT due to the conflation of the effects from pulsed currents. Herein, a clear correlation is identified between induced stress levels and the application of pulsed electrical current. It was found that the decrease in flow stress is positively correlated with the current density and the duration of electrical contact and current action time. We first systematically and comprehensively summarize the influence mechanisms of EPT on dislocations, phase, textures and recrystallization. An analysis of Joule heating, electron wind effect, and thermal–induced stress within metal frameworks under the influence of pulsed currents was conducted. And the distribution of electric, thermal and stress fields under EPT are discussed in detail based on a finite element simulation (FES). Finally, some new insights into the issues and challenges of flow stress drops caused by EPT are proposed, which is critically important for advancing related mechanism research and the revision of theories and models.

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Improved ductility of Fe-6.5 wt%Si alloy under electropulsing tension

Cited by 10 publications

References 55 publications

Pulsed current-assisted twelve-roll precision rolling deformation of SUS304 ultra-thin strips with exceptional mechanical properties

Pulsed current-assisted twelve-roll precision rolling deformation of SUS304 ultra-thin strips with exceptional mechanical properties

Effects of electrical pulse on metal deformation behaviors

Mechanism of Electropulsing Treatment Technology for Flow Stress of Metal Material: A Review

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