Colony (grain) size reduction in eutectic Pb-Sn castings by electroplusing

Barnak, J. P.; Sprecher, A.F.; Conrad, H.

doi:10.1016/0956-716x(95)93218-s

Cited by 141 publications

(78 citation statements)

References 6 publications

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“…It has been found that the free energy associated with electric current, . The calculation explains the experimental observations in solidification [5,6], amorphous alloy crystallization [7], crack healing in steels [8], solid phase transition [9,10] and so on. Dolinsky and Elperin have applied Eq.…”

Section: Introductionmentioning

confidence: 62%

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: Introductionmentioning

confidence: 62%

Electropulse-induced cementite nanoparticle formation in deformed pearlitic steels

2011

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“…When direction of the F2 points out outside, the instability atom groups are broken as free atoms as Figure 8b, but the rate of gather overtops the rate of dispersed The other one reason comes from solidification stage. According to Barnak the pinch force F2 can be expressed as the following formula [15] .…”

Section: Discussionmentioning

confidence: 99%

The Mechanism Research of Electric Current Pulse and Electromagnetic for Grain Refinement of 6181 Aluminum Alloys During Two-roll Casting

Xu¹

2016

Res. Rev. J Mat. Sci

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6181 aluminum alloys sheets were produced by two-roll casting with electric current pulse and magnetic fields, and the microstructures were observed. The experimental results show that application of composite fields (ECP and EM field) during TRC process refines the microstructures of sheets more evenly and effectively by comparison with individual application of ECP or EM field. For visually explaining the phenomenon, the distribution and amplitude of the magnetic induction intensity B and electromagnetic force F were obtained by numerically simulated. In addition, an obvious improvement of tensile strength by physical fields was measured. But the maximum elongation was from action of magnetic field and reached 10.9%.

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“…The treatment has also been applied to various aspects of materials processing, e.g. to generate plasticity [3], to refine microstructure [4] and to expedite structural relaxation [5,6].…”

Section: Introductionmentioning

confidence: 99%

Effect of electric current pulses on the microstructure and niobium carbide precipitates in a ferritic-pearlitic steel at an elevated temperature

Rahnama

Qin

2015

J. Mater. Res.

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Niobium is an important alloying element in steels. In the present work an effort has been made to investigate the effect of electropulsing on the niobium carbide (NbC) at an elevated temperature (800 ºC). The results show that the electropulsing treatment can generate an evenly distributed NbC by decreasing the kinetics barriers for precipitation. It has been also found that a semi-transformed pearlite structure forms in such a way that the grains are oriented towards a direction parallel to that of the electric current flow. Furthermore, the electropulsed sample benefits from refined grain size. This is thought to be due to the electropulse-enhanced nucleation rate. Tensile testing has been carried out in order to compare the properties of electropulsed sample with that of without electropulsing. The results show that the sample with treatment has greater yield strength and ultimate tensile stress (UTS) while its elongation is only 1% less that of the unelectropulsed samples. The improved mechanical properties of the sample with pulsing are attributed to its finer grain sizes as well as the elimination of precipitation free zones (PFZs) caused by the electropulsing treatment.

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Colony (grain) size reduction in eutectic Pb-Sn castings by electroplusing

Cited by 141 publications

References 6 publications

Electropulse-induced cementite nanoparticle formation in deformed pearlitic steels

Electropulse-induced cementite nanoparticle formation in deformed pearlitic steels

The Mechanism Research of Electric Current Pulse and Electromagnetic for Grain Refinement of 6181 Aluminum Alloys During Two-roll Casting

Effect of electric current pulses on the microstructure and niobium carbide precipitates in a ferritic-pearlitic steel at an elevated temperature

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