Effect of Electropulsing on Grain Refinement of a Medium Carbon Low Alloy Steel

Yu, Wen; Qin, Rong Shan; Wu, Kai

doi:10.4028/www.scientific.net/amr.146-147.1849

Cited by 6 publications

(5 citation statements)

References 15 publications

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“…It is important to note the difference in electropulsing conditions typically used in literature, where appreciable temperature rise is part of the process [19][20][21][22]. Researchers have shown that properly tuning electropulsing parameters can increase dislocation mobility, accelerate vacancy movements, and reform the microstructure of materials by refining the grain size and structure [23][24][25]. Wu et al [23] have shown that the electric pulse can improve the plasticity in cold-rolled pure copper sheets by inducing rapid recrystallization.…”

Section: Introductionmentioning

confidence: 99%

Room temperature control of grain orientation via directionally modulated current pulses

Rahman,

Oh,

Waryoba

et al. 2023

Mater. Res. Express

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Traditional approaches to control the microstructure of materials, such as annealing, require high temperature treatment for long periods of time. In this study, we present a room temperature microstructure manipulation method by using the mechanical momentum of electrical current pulses. In particular, a short burst of high-density current pulses with low duty cycle is applied to an annealed FeCrAl alloy, and the corresponding response of microstructure is captured by using Electron Backscattered Diffraction (EBSD) analysis. We show evidence of controllable changes in grain orientation at specimen temperature below 28 C. To demonstrate such microstructural control, we apply the current pulses in two perpendicular directions and observe the corresponding grain rotation. Up to 18 of grain rotation was observed, which could be reversed by varying the electropulsing direction. Detailed analysis at the grain level reveals that electropulsing in a specific direction induces clockwise rotation from their pristine state, while subsequent cross-perpendicular electropulsing results in an anticlockwise rotation. In addition, our proposed room temperature processing yields notable grain refinement, while the average misorientation and density of low-angle grain boundaries (LAGBs) remain unaltered. The findings of this study highlight the potentials of 'convective diffusion' in electrical current based materials processing science towards microstructural control at room temperature.

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Section: Introductionmentioning

confidence: 99%

Room temperature control of grain orientation via directionally modulated current pulses

Rahman,

Oh,

Waryoba

et al. 2023

Mater. Res. Express

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“…The application of electropulsing has been extensively studied in recent years. These studies showed that the electropulsing treatment can have a marvellous application foreground in affecting the plasticity 9 10 11 12 , recrystallization 12 13 14 15 , phase transformation 16 17 18 19 20 , microstructural evolution 1 2 21 22 , cast microstructure 23 and fatigue life 24 of alloys. The effect of electropulsing treatment on the formability of metallic materials were also studied extensively 25 26 27 .…”

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confidence: 99%

Room temperature texturing of austenite/ferrite steel by electropulsing

Rahnama

Qin

2017

Sci Rep

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The work reports an experimental observation on crystal rotation in a duplex (austenite + ferrite) steel induced by the electropulsing treatment at ambient temperature, while the temperature rising due to ohmic heating in the treatment was negligible. The results demonstrate that electric current pulses are able to dissolve the initial material’s texture that has been formed in prior thermomechanical processing and to produce an alternative texture. The results were explained in terms of the instability of an interface under perturbation during pulsed electromigation.

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“…In the past few decades, fast heat treatment processes, such as the electropulsing treatment (EPT), have attracted more and more attention, which can cause the dramatic changes on the microstructure and mechanical behavior of alloys [9][10][11]. As an effective fast-heating approach, EPT can effectively optimize the crystal structures, such as the grain refinement in solid state through accelerating the kinetic of recrystallization [12,13].…”

Section: Introductionmentioning

confidence: 99%

“…For example, Ao et al [12] found that EPT effectively promoted the recrystallization behavior of Ti-6Al-4V alloy with extremely short-time under a relative low temperature, comparing to the traditional heat treatment. Yu et al [13] investigated the effect of EPT on grain refinement of a medium carbon low alloy steel, and it was found that EPT could decrease the potential barriers for recrystallization nucleation and increase its rate. Guo et al [14] studied the influence of EPT on the recrystallization behavior of cold-rolled Mg alloy ZK60 strips, and it was found that the nucleation rate and migration ability of grain boundaries were significantly promoted by EPT, leading to the acceleration of recrystallization behavior at the relatively low temperature.…”

Section: Introductionmentioning

confidence: 99%

Static Recrystallization Microstructure Evolution in a Cold-Deformed Ni-Based Superalloy during Electropulsing Treatment

Zhang¹,

Zhang²,

Han³

et al. 2020

Crystals

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The influence of electropulsing treatment (EPT) parameters on the static recrystallization (SRX) microstructure in a cold-deformed Ni-based superalloy was investigated. During EPT, both the volume fraction of SRX grains and the average grain size increased with the increasing EPT temperature, which was attributed to the thermal effect and athermal effect induced by EPT. The mobility of SRX grain boundaries was promoted at the higher temperature due to the thermal effect, while the nucleation rate would be increased by EPT through decreasing the thermodynamic barrier. The formation of parallel dislocations caused by electron wind force could also play an indirect role in promoting SRX process. Moreover, the volume fraction of SRX grains increased significantly with the extension of EPT time at 700 °C, while the EPT time had a trivial effect on the average grain size. In addition, the sufficient deformation was essential to the occurrence of SRX behavior during EPT, and the localized Joule heating effect could promote the SRX behavior in the samples with the larger strains. Besides that, the influence of twining and carbides on the SRX behaviors was also investigated.

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Effect of Electropulsing on Grain Refinement of a Medium Carbon Low Alloy Steel

Cited by 6 publications

References 15 publications

Room temperature control of grain orientation via directionally modulated current pulses

Room temperature control of grain orientation via directionally modulated current pulses

Room temperature texturing of austenite/ferrite steel by electropulsing

Static Recrystallization Microstructure Evolution in a Cold-Deformed Ni-Based Superalloy during Electropulsing Treatment

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