Mechanical and metallurgical changes on 308L wires drawn by electropulses

Egea, Antonio J. Sánchez; Rojas, Hernan Alberto González; Celentano, Diego J.; Peiró, Jordi Jorba

doi:10.1016/j.matdes.2015.11.067

Cited by 49 publications

(22 citation statements)

References 24 publications

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“…(1) Node 3067 first moves along the negative Z-axis and continues along the X-axis, and as the discharge voltage increases, the maximum displacement along the X-axis at node 3067 increases. (2) The maximum displacement along the Z-axis at node 3067 is always the same (up to 1 mm) regardless of the discharge voltage. This means that the sheet end will contact the die at different voltages.…”

Section: Discharge Voltagementioning

confidence: 90%

“…Equation (1) describes the quasi-static stress-strain relationship of the sheet metal. In order to describe the effect of high strain rate on the forming process, the Cowper-Symonds constitutive model is used, as shown in Equation (2). The data in Equations (1) and (2) are quoted from the literature of Cui et al [21].…”

Section: Materials and Geometrical Modelmentioning

confidence: 99%

“…With stretch bending, applying a much larger tensile stress to the sheet can reduce the springback effect, but this also exacerbates the thinning of the sheet. In the field of electrically-assisted forming, Egea et al [1,2] proved that electrically-assisted bending is effective to reduce the bending force and the elastic restoring force during the bending process [1]. Moreover, the electrically-assisted wire-drawing process is feasible to enhance the material formability compared to the conventional wire-drawing process.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Springback Reduction of L-Shaped Part Using Magnetic Pulse Forming

Cui

Xiao

et al. 2020

Metals

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This study proposes an electromagnetic-assisted stamping (EMAS) method with magnetic-force loading at the sheet end in order to control the springback phenomenon. The new method does not change the structure of the mold and does not generate a magnetic force at the sheet corner compared to traditional EMAS. Thus, the new approach could greatly extend the mold lifespan and could be readily adopted in commercial production environments. The effects of technological parameters, such as the distance between the blank holder and die, discharge voltage, and sheet thickness on the springback phenomenon were analyzed. Our results suggest that tangential stress and elastic strain energy both decrease with the increase of discharge voltage. The simulation method accurately predicted the deformation of the sheet during the quasi-static stamping and dynamic magnetic forming processes. The simulation and experimental results both show that as the discharge voltage increases, the bent angle after springback decreases.

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Section: Discharge Voltagementioning

confidence: 90%

Section: Materials and Geometrical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Springback Reduction of L-Shaped Part Using Magnetic Pulse Forming

Cui

Xiao

et al. 2020

Metals

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“…When comparing the configurations of two different radial feeds and a burnishing pressure of 10 MPa, Chen et al [19] denoted that the smaller radial feed configuration exhibited continuous strain distribution and higher strain values due to the accumulative plastic strain. Conversely, Sánchez et al [20] observed discontinuous and smaller values of strain distribution when a larger radial feed was used. Such a strain discontinuity could be critical to ensure a cold work and compressive residual stress in the surface to improve the fatigue lifespan.…”

Section: Prediction Of Residual Stress Distributions Based On the Radmentioning

confidence: 93%

Joining metrics enhancement when combining FSW and ball-burnishing in a 2050 aluminium alloy

Egea

Rodríguez

Celentano

et al. 2019

Surface and Coatings Technology

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This report describes the effect of the ball-burnishing process on the mechanical properties of 2050 aluminium alloy that was previously friction stir welded. This process is a fast, environmentally-friendly and cost-effective surface treatment based on the plastic deformation of the surface irregularities. Consequently, residual stress, material hardening and micro-structural alterations are investigated to improve fatigue strength and wear resistance. The results show that the ball-burnishing treatment enhances the surface properties by increasing the material hardness about 37.5% and by decreasing the average surface roughness from 2.23 μm to 0.06 μm when a high pressure and a perpendicular burnishing is deployed. Additionally, in-depth compressive residual stresses are generated from −315 MPa to −700 MPa depending on the burnishing configuration. Finally, a numerical simulation of the material elastoplastic response is performed to analyze the residual stress continuity in the cross sectional area when using two radial feeds and burnishing pressures. In short, the present study helps to reduce time consumption by selecting the larger radial feed combined with a proper burnishing pressure to ensure the desired quality and compressive residual stress at the surface, which are indices of enhancing the fatigue strength at the nugget zone of the welded area.

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“…Scholars also studied the EA forming process, such as drawing, rolling, bending, and embossing. Egea et al [28] studied the current-assisted drawing process of 308L stainless steel. It was found that the material formability and energy efficiency increased by 11.9% and 7.6%, respectively.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Electrically-Assisted Rolling Process of Corrugated Surface Microstructure with T2 Copper Foil

et al. 2019

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Electrically-assisted (EA) forming is a low-cost and high-efficiency method to enhance the formability of materials. In the study, EAF tensile tests are carried out to study the properties of T2 copper foil in an annealed state, and the effect of the electric current on the forming quality of corrugated foils is further studied in the EA rolling forming process. The result shows that the current reduces the flow stress and the fracture strain, which is different from the result of rolled samples. The joule heating effect on mechanical properties is significant in EA tension, and the softening effect of the surface layer can be observed at tensile strength, due to the grain size effect. Moreover, the current can weaken the grain size effect. In the rolling forming process, the influence of different electrical parameters on the forming height is remarkable, especially for the rolled T2 copper. The appropriate electrical parameters can improve the forming height, while keeping a small thickness thinning. Nevertheless, the high current density will lead to local rupture. This study proves that the current can improve the forming quality of the corrugated foils and is a promising surface texture forming process.

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Mechanical and metallurgical changes on 308L wires drawn by electropulses

Cited by 49 publications

References 24 publications

Springback Reduction of L-Shaped Part Using Magnetic Pulse Forming

Springback Reduction of L-Shaped Part Using Magnetic Pulse Forming

Joining metrics enhancement when combining FSW and ball-burnishing in a 2050 aluminium alloy

Investigation of Electrically-Assisted Rolling Process of Corrugated Surface Microstructure with T2 Copper Foil

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