Effect Of Electropulsing Treatment Research Articles

The Effect of Electropulsing Treatment on Properties of Pre-compressed AZ31 Magnesium Alloy

The effect of electropulsing treatment (EPT) on quasi-static compression behavior and anisotropy of AZ31 Mg alloy were investigated based on quasi-static compression test. The results show that the orientation of the sample has a significant effect on the deformation mechanism of metal and this mechanism can be changed by pre-deformation and EPT. However, the strain rate sensitivity of the material is not affected by pre-deformation. Compared with the as-received plates, the anisotropy of AZ31 Mg alloy increased in ND-RD plane after pre-compression along the transverse direction, the ∆YS of specimens increased from 87 MPa to 98 MPa. After EPT, the anisotropy of AZ31 Mg alloy gradually decreased with the change of EPT temperature and EPT time, the ∆YS of the sample reached 14.2 MPa when EPT conducted at 200 ℃ for 15 min, which decreased 72.8 MPa compared with the as-received plates.

Effect of electropulsing treatment on static recrystallization behavior of cold-rolled magnesium alloy ZK60 with different reductions

Effect of electropulsing treatment (EPT) on recrystallization behavior of cold-rolled Mg alloy ZK60 strips was investigated. It was found that EPT significantly improved nucleation rate and migration ability of grain boundaries, leading to accelerated recrystallization of the deformed metals at relatively low temperature. After the recrystallization induced by EPT, the average grain size of 20% rolling reduction samples decreased from 113 μm to around 10 μm, meanwhile the typical basal-type texture of the cold-rolled sample was weakened. EPT was normally accompanied with a thermal and an athermal effects. The athermal effect played a dominated role in increasing nucleation rate, while the thermal effect promoted grain growth. A fewer recrystallized grains originated along the grain boundaries in the 10% reduction samples, while most of the recrystallization took place inside the twins in the 20% reduction samples.

Effect of Electropulsing Treatment on the Fatigue Crack Growth Behavior of Copper.

Crack propagation was quantitatively evaluated to investigate the effect of electropulsing treatment (EPT) on fatigue crack growth of copper specimens. Varying fatigue cycles were obtained under six different load levels. The crack lengths were measured under two load levels to examine the effect of cyclic stress. The microhardness was measured around the vicinity of the crack tip. Furthermore, the fracture surface was observed by scanning electron microscopy. Results show that EPT with electric current density of 150 A/mm2 enhances the high-cycle fatigue life, and the effect tends to increase with the decrease in cyclic stress. Vickers microhardness (HV) near the crack tip decreases to normal levels after treatment, and the approaching cracks on two sides can be observed. Local annealing and recrystallization occur around the fatigue crack tip. Accordingly, crack propagation can be delayed, and fatigue life can be prolonged by EPT.

Effect of electropulsing treatment on the microstructure, texture, and mechanical properties of cold-rolled Ti–6Al–4V alloy—RETRACTION

Effect of electropulsing treatment on the microstructure, texture, and mechanical properties of cold-rolled Ti–6Al–4V alloy—RETRACTION

Recovery of tensile properties of twinning-induced plasticity steel via electropulsing induced void healing

The effects of electropulsing treatment (EPT) and annealing on the tensile behaviors of twinning-induced plasticity (TWIP) steel after interrupted tension are compared. It is found that EPT effectively restores the tensile property of specimens with macro voids completely, while annealing could not. The selective heating and thermal compressive stress induced by EPT around voids make them readily to be healed while keeping the matrix unchanged. The healing effect of voids improves the strain-hardening capability of TWIP steels and leads to the recovery of strength and elongation of the EPT specimen, relative to those annealed counterparts.

Hardening and softening mechanisms in a nano-lamellar austenitic steel induced by electropulsing treatment

The effects of electropulsing treatment (EPT) on the microstructure and corresponding mechanical properties of a nano-lamellar 316L austenitic stainless steel were investigated. The original 316L stainless steel features a nano-lamellar framework with high density of dislocations via cold rolling. The nanostructured stainless steel was hardened and strengthened after EPT with relatively low discharge voltage, which may result from the cooperative effect of stable nano-lamellar structure and mobile dislocations recovery. Both the microhardness and tensile strength would decrease significantly with the increase of discharge voltage due to the nucleation and growth of recrystallized grains in the steel.

Effect of electropulsing treatment on microstructure and mechanical behavior of Ti-6Al-4V alloy sheet under argon gas protection

The effect of electropulsing on microstructure and mechanical behavior of Ti-6Al-4V alloy sheet was studied by the electropulsing treatment tests under argon gas protection. Compared to conventional treatment test without current, the specimen tensile strength keeps constant and the maximum plasticity increases by 21.67% with current density of 17.8 A/mm2 under electropulsing treatment. An empirical model to predict the temperature evolution of Ti-6Al-4V sheet under electropulsing was established. To understand the mechanism of electropulsing treatment, the microstructure of electropulisng treated specimens was analyzed. The results show that the electropulsing can accelerate the recrystallization and phase transformation of Ti-6Al-4V under a relatively low temperature compared to heat treatment. The enhancement of elongation at 17.8 A/mm2 is attributed to rapid recrystallization. Based on the contribution of thermal and athermal effect on thermodynamics and kinetics, the mechanism of the electropulsing on the recrystallization and phase transformation are discussed.

Corrigendum to "Effect of electropulsing treatment and ultrasonic striking treatment on the mechanical propertis and microstructure of biomedical Ti-6Al-4V alloy"

Corrigendum to "Effect of electropulsing treatment and ultrasonic striking treatment on the mechanical propertis and microstructure of biomedical Ti-6Al-4V alloy"

Effect of electropulsing treatment on microstructure and mechanical properties of intermetallic Al3Ti alloy

Abstract Effects of electropulsing treatment (EPT) on the microstructure evolution, mechanical properties and crack healing of intermetallic Al3Ti alloys were studied in this work. In order to investigate the athermal effect caused by EPT, conventional heat treatment (CHT) was conducted for comparison. The compressive stress-strain curves demonstrated that the failure strains of Al3Ti alloy increase under both the EPT and CHT conditions, while the increment of failure strain of Al3Ti alloy treated by EPT is higher than that treated by CHT. Fracture surface analysis confirmed that the intrinsic brittle fracture of Al3Ti alloy evolves into the quasi-cleavage fracture with increasing frequency of EPT. Based on the systematic investigation into the microstructure evolution, mechanical properties and fracture surface observation, the influence mechanism of EPT on Al3Ti alloy was found to be related to the improvements of atomic diffusion and dislocation movement, which results from the coupling of thermal effect and athermal effect by EPT. Furthermore, the thermal compressive stress and athermal effect could heal the local micro-crack and decrease the crack width of Al3Ti alloy by EPT. Therefore, EPT can work as a novel method for improving the plastic deformation capacity of Al3Ti alloy.

Effect of electropulsing treatment on microstructure and tensile fracture behavior of nanocrystalline Ni foil

Electropulsing treatment (EPT) is utilized to increase the plasticity of nanocrystalline Ni foil. Uniaxial tensile tests at room temperature are adopted to investigate the influence of EPT on the mechanical properties under different peak current density. It is shown that electropulsing with certain strength can improve the elongation significantly. The evolution of the fracture morphology, stacking faults, twinning and dislocation of nanocrystalline Ni under EPT is studied via scanning electron microscopy (SEM) and transmission electron microscopy (TEM), and the plastic deformation mechanism under EPT is also researched.

Crystallization of a Ti-based Bulk Metallic Glass Induced by Electropulsing Treatment

The effect of electropulsing treatment (EPT) on the microstructure of a Ti-based bulk metallic glass (BMC) has been studied. The maximum current density applied during EPT can exert a crucial role on tuning the microstructure of the BMC. When the maximum current density is no more than 2720 A/mm2, the samples retains amorphous nature, whereas, beyond that, crystalline phases precipitate from the glassy matrix. During EPT, the maximum temperature within the samples EPTed at the maximum current densities larger than 2720 A/mm2 is higher than the crystallization temperature of the BMG, leading to the crystallization event.

电脉冲处理对钛合金超精密切削的影响

电脉冲处理对钛合金超精密切削的影响

电脉冲处理对钛合金超精密切削的影响

电脉冲处理对钛合金超精密切削的影响

Effects of electropulsing treatment on material properties and ultra-precision machining of titanium alloy

Titanium alloy is well known with difficult machinability, which limits its application unavoidably. In this study, electric pulse treatment (EPT) is firstly employed to change the material properties and improve the machinability of titanium alloy Ti6Al4V in ultra-precision machining. A series of tests of EPT and ultra-precision cutting have been carried out. Effects of EPT parameters on microstructure and mechanical properties of Ti6Al4V have been investigated. The chip morphology, cutting force, and surface roughness of titanium alloys after EPT and without EPT in ultra-precision machining have been analyzed, too. It was found that EPT technology can improve the machinability of titanium alloy in ultra-precision machining and the machinability of titanium alloy becomes better with the increasing of current density and frequency of EPT.

Effects of High-Energy Electro-Pulsing Treatment on Microstructure and Corrosion Behavior of Ti-6Al-4V Alloy

The effect of electro-pulsing treatment (EPT) on the microstructure and corrosion behavior of cold-rolled Ti-6Al-4V alloy strips is investigated in this paper. It’s found that anti-corrosion property of titanium alloys is greatly improved with the help of EPT, which is demonstrated by the polarization test and surface observation with the beneficial effect of refining microstructure and forming a protective anatase-TiO2 film on the materials surface. The rapid recrystallization process and oxide formation of the titanium alloy strip under EPT are attributed to the enhancement of nucleation rate, atomic diffusion and oxygen migration resulting from the coupling of the thermal and athermal effects. It’s a novel viewing angle of relationship among the electropulsing process, microstructure and corrosion behavior, which is facilitated in the future research and application of biomedical titanium alloys.

RETRACTED: Effect of electropulsing treatment on microstructure and mechanical properties of cold-rolled pure titanium strips

Commercially pure titanium strips were successfully processed by electropulsing treatment (EPT) at relatively low temperature compared to the traditional heat treatment. The results indicated that the ductility of titanium materials is dramatically improved by electropulse while remaining uniaxial tensile strength unchanged, with the increased volume fraction of fine recrystallized grains through electron back-scattered diffraction analysis. However, too high-frequency EPT brought in the coarsened grains and worsened mechanical properties. A mechanism for rapid recrystallization and grain growth in low temperature during EPT was proposed based on the reduction of nucleation thermodynamic barrier and enhancement of atomic diffusion. It is supposed that high-efficiency EPT could provide a highly efficient method for the intermediate-softening annealing of titanium sheet/strips within well-designed process.

RETRACTED: Effect of electropulsing treatment and ultrasonic striking treatment on the mechanical properties and microstructure of biomedical ti-6Al-4V alloy

This article has been retracted: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy). This article has been retracted at the request of the Editor-in-Chief. The authors have reused figures and text that have already appeared in their previous articles. Figure 6a duplicates figure 6a (horizontally flipped) in Reference [1], while figure 6c duplicates figure 6c in Reference [1] and figure 3c in Reference [2] (albeit different scale is reported for each of these three figures). Figure 7 duplicates panels from figure 9 in Reference [3]. The article also duplicates parts of the text that appeared in Reference [1]. One of the conditions of submission of a paper for publication is that authors declare explicitly that their work is original and has not appeared in a publication elsewhere. Re-use of any data should be appropriately cited. As such this article represents an abuse of the scientific publishing system. The scientific community takes a very strong view on this matter and apologies are offered to readers of the journal that this was not detected during the submission process. Journal records indicate that confirmation of the submission and publication of the article was sent to the first author’s email address but not to the corresponding author's email address.

Microstructure and Mechanical Properties of Cold-Rolled Mg-6Al-1Zn Alloy Strip Treated by Electropulsing Treatment

The effect of electropulsing treatment (EPT) on the microstructure and mechanical properties of the cold-rolled Mg-6Al-1Zn alloy strip was investigated. It is found that EPT accelerated the recrystallization behaviour of the cold-rolled Mg-6Al-1Zn alloy strip at a relatively low temperature within a short time of 14 seconds. When the temperature of EPT was 423 K, recovery of Mg matrix happened and few β-Mg17Al12 phaseprecipitated in the Mg matrix. With increasing the temperature to 463 K, recrystallization occurred, accompanying dissolution of β-Mg17Al12 phase. When the temperature was increased to 483 K, complete recrystallization took place and obtained fine microstructure of quasi-single-phase recrystallized grains. The elongation to failurewas increased from the 6.3 % of the rolled strip to 23.5 %, while the tensile strength was decreased from 368 MPa to 300 MPa. Further increasing the temperature of EPT, the apparent grain growth occurred and both the tensile strength and elongation to failure reduced. A mechanism for rapid recrystallization process during EPT was discussed.

Influence of electropulsing treatment on the recrystallization and texture of Ni9W alloy strip

Abstract

Effects of electropulsing treatment on mechanical properties in Ti rich TiNi shape memory alloy

The influence of electropulsing treatment on thermomechanical behaviour in terms of transformation temperatures and mechanical properties of a cold worked Ti rich TiNi shape memory alloy was studied. The results showed that the transformation temperatures increase with increasing current intensity. The superelasticity of the alloy is improved after the electropulsing treatment, and the hardness of the alloy decreased with increasing current intensity. The microstructure of the alloy showed that the above changes can be attributed to the decreasing dislocation density due to the current pulses.