Rapid nanocrystallization from amorphous Fe78B13Si9 by high current density electropulsing

Teng, Gong‐Qing; Chao, Yang; Lai, Zhao-Rong; Dong, Lin

doi:10.1007/bf00456571

Cited by 11 publications

(4 citation statements)

References 2 publications

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“…After electric current passing by, state 1 is left at high free energy state but unable to transform into the lower free energy state 0 because of the high kinetic barrier at low temperature. The kinetic barrier is much lower during the passing of high density electric current according to the previous experimental observations [ [14][15][16][17].…”

Section: Resultssupporting

confidence: 68%

“…The general conclusion after all of those calculations is that the passing electric current promotes the formation and growth of phase with higher electrical conductivity. Kinetically, it has been found that passing electric current can accelerate microstructure transformation [7,14] and decrease the transition starting temperature [15][16][17]. Recently, Samuel et al reported the electropulsing-accelerated spheroidization of cementite plates in deformed pearlitic steels [18].…”

Section: Introductionmentioning

confidence: 99%

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Electropulse-induced cementite nanoparticle formation in deformed pearlitic steels

2011

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Passing one electric-current pulse through deformed pearlitic steel wires at room temperature causes the formation of cementite particles around 30 nm in size. This is found not only in some particular locations but throughout the cementite area, which reveals a different mechanism from traditional spheroidization of cementite plates because the latter leads to the formation of particles with much large size. Transmission electron microscopy images show electropulse-induced strain relief and formation of fine precipitations. Differential scanning calorimetry analysis demonstrates the additional stored free energy by electropulsing treatment. The raised free energy accounts the increased interface area in finer microstructure of materials. The experiment evidences that the passing electric current in metal has alternated the free energy sequence of various microstructures in comparison with that of current-free system.

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Section: Resultssupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Electropulse-induced cementite nanoparticle formation in deformed pearlitic steels

2011

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“…When liquid steel is treated with electropulsing, the dendritic crystal become smaller and thus fine-grained solidified structure obtained [10][11][12]. It is also reported that electropulsing can enhance nucleation and restrain grain growth in non-crystalline materials [16,17]. Generally, these effects are divided into thermal effect i.e.…”

Section: Resultsmentioning

confidence: 99%

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

Qin

2010

AMR

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Electropulsing at room temperature was applied to a medium carbon low alloy steel 30CrMo with varying peak voltage and current. The results showed that the pearlite colony in the specimen treated with electropulsing was smaller than that without electropulsing treatment. It was found that the lamellar structure of pearlite was refined. The grain refinement of pearlite was more obvious when the applied electric current density was higher. This may be attributed to additional free energy for the nucleation of pearlite provided by electropulsing and/or the enhancement of dislocation movement caused by electropulsing.

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“…With increasing demand for clean processing of high performance steels, more efficient treatments are required. Research has shown that electropulsing can induce microstructure evolution in a range of metallic materials [1][2][3][4][5][6] with much shorter processing times and lower energy requirements compared to traditional heat treatment methods. In particular, electropulsing has been shown to increase spheroidisation with increasing current amplitude and produce nanoscale particles in cold-drawn pearlitic steel wire after a single high current density pulse [7,8].…”

Section: Introductionmentioning

confidence: 99%

Electrothermomechanical Processing of High Carbon Steels

Elliott-Bowman

Cook

Brown

et al. 2014

AMR

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Passing high density electric current through some metals has been shown to induce microstructural changes, such as grain refinement. Known as electropulsing, the process has previously been successfully applied to cold-drawn pearlitic steel wire over a very short treatment period (current density >103 A·mm-2 and pulse width <10-4s) and with low energy expenditure. Once optimised, electropulsing treatment may offer potential time-and energy-saving advantages over traditional grain refinement techniques. However, to date, very little research on the effects of electropulsing on pearlitic steel exists in the literature and is limited to steel wire. The current work was conducted to determine whether electropulsing treatment is capable of producing similar grain refinement and spheroidisation behaviour in the microstructure of cold-deformed high carbon pearlitic steel sheet (0.92wt%C). High current density electropulsing treatment was applied to pearlitic steel samples of 40 to 70% rolling reduction for 50 or 100 pulses. The electropulsing treatment did produce microstructural changes in pearlitic steel plate that was similar to that observed in pearlitic steel wire over a relatively short treatment time. These changes involved grain refinement and spheroidisation and were enhanced with increasing cold rolling reduction.

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Rapid nanocrystallization from amorphous Fe78B13Si9 by high current density electropulsing

Cited by 11 publications

References 2 publications

Electropulse-induced cementite nanoparticle formation in deformed pearlitic steels

Electropulse-induced cementite nanoparticle formation in deformed pearlitic steels

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

Electrothermomechanical Processing of High Carbon Steels

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