Morphology and distribution control of MnS inclusions in molten steel by electropulsing

Zhang, X. F.; Lu, Wenjun; Qin, Rong Shan

doi:10.1179/1432891714z.000000000829

Cited by 13 publications

(11 citation statements)

References 6 publications

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“…Equation (3) can be used to explain the movement of electrically neutral nuclei in the melt from the center to the lateral surface [ 69 , 70 ]. The electrical conductivity of the melt at 889 K is 4 × 10 4 S·cm −1 [ 71 ], and the electrical conductivity of the primary α-Al phase is 10 5 S·cm −1 [ 72 ].…”

Section: Mechanisms Of the Impact Of Pulse Treatment On Metal Meltsmentioning

confidence: 99%

“…To minimize the free energy associated with the ECP, the crystals are forced to move from their original location to the center of the ingot by the force F generated by the ECP. The direction of the force is perpendicular to the direction of the electric current (from the center of the mold to the lateral surface) and is axisymmetric for σ 1 > σ 2 [ 69 , 70 ]. The direction is reversed when σ 1 < σ 2 .…”

Section: Mechanisms Of the Impact Of Pulse Treatment On Metal Meltsmentioning

confidence: 99%

“…The direction is reversed when σ 1 < σ 2 . An approximate expression for the magnitude of the driving force from the electric current to the crystal nuclei is given as [ 69 , 70 ]:

where d is the distance from the central axis of the melt along the radius, and f(d) increases monotonically, but nonlinearly with increasing d . According to Equation (4), F is proportional to the change in free energy ∆ G e .…”

Section: Mechanisms Of the Impact Of Pulse Treatment On Metal Meltsmentioning

confidence: 99%

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Theory and Practice of Using Pulsed Electromagnetic Processing of Metal Melts

2022

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In industrial practice, various methods of external influences on metal melts are used. For example, vibration processing, exposure to ultrasound, and other physical fields. The main purpose of such influences is purposeful grinding of the metal structure, which contributes to the improvement of mechanical characteristics. The article presents an overview of research on pulse processing of ferrous and non-ferrous melts: processing with pulsed current, electromagnetic pulses and pulsed magnetic fields. The results of the analysis showed that, despite the different methods and devices used for these treatments, their effect on the structure and properties of the cast metal is generally the same. The main effect is observed in the refinement of the macro and microstructure and a simultaneous increase in the strength properties and plasticity. The intensity of the observed effects depends on the characteristics of the equipment used to create the pulses. The main characteristics are: pulse duration, pulse frequency, current amplitude, and power.

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Section: Mechanisms Of the Impact Of Pulse Treatment On Metal Meltsmentioning

confidence: 99%

Section: Mechanisms Of the Impact Of Pulse Treatment On Metal Meltsmentioning

confidence: 99%

“…The direction is reversed when σ 1 < σ 2 . An approximate expression for the magnitude of the driving force from the electric current to the crystal nuclei is given as [ 69 , 70 ]:

Section: Mechanisms Of the Impact Of Pulse Treatment On Metal Meltsmentioning

confidence: 99%

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Theory and Practice of Using Pulsed Electromagnetic Processing of Metal Melts

2022

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“…The review has been divided into four sections. The potential application of pulsed electric current in material processing has been explored from the existing literature [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Research [21][22][23][24] shows that the application of electromagnetic field for dropletbased microfluidic materials is significant with complex phenomena, such as dielectrophoresis (DEP) and electromagnetophoresis.…”

Section: Introductionmentioning

confidence: 99%

Application of pulsed electric current in immiscible liquid and droplet processing

Sultana

2018

Materials Science and Technology

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Electromagnetic, chemical and thermo-mechanical processing can be applied to the fabrication of polymeric materials which react to external fields such as stress, temperature, moisture, pH, electric or magnetic fields to optimise properties. In this article, the application of the pulsed electromagnetic field in an immiscible liquid phase is reviewed. The droplet behaviour of polymer emulsion's liquid phases is enriched with significant complex phenomena. In emulsion, droplet break-up, size evolution, coalescence, coarsening, flocculation and interfacial interaction among droplets are assessed as a function of processing. This review was submitted as part of the 2018 Materials Literature Review Prize of the Institute of Materials, Minerals and Mining run by the Editorial Board of MST. Sponsorship of the prize by TWI Ltd is gratefully acknowledged.

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“…19 It is not clear whether this has been followed up into commercialisation, but the focus of research seems to have shifted towards the refinement 20 or control and exclusion of non-metallic inclusions from melts. 21 It is possible that these particular phenomena, which rely on the different physical properties of non-metallic inclusions when compared with the melt, might be amenable to commercial exploitation on a significant scale.…”

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confidence: 99%

The Electrical Processing of Materials

Bhadeshia¹

2015

Materials Science and Technology

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High frequency pulses of electrical current have long been known to induce dramatic changes in the structure and properties of materials, 1 including for example, the healing of internal cracks in microseconds 2,3 and electrically induced plasticity as an aid to shape forming. [4][5][6] If the temperature rise associated with the pulsing is sufficient, then the dislocation density can be affected even if the pulse duration is just a few millionths of a second. 7 In a recent editorial, I commented on the promise of the method, which thus far has not had any major exploitation, and on the need for a theoretical framework that is quantitatively predictive. 8 To explore these ideas further, a critical assessment was commissioned, 9 the conclusions from which can be paraphrased as follows:1. it is possible that the method may replace thermomechanical processing because the capital requirement is smaller, at least on the laboratory scale that has been explored thus far. 2. That there is no single case where theory has been applied quantitatively. 3. That speculation regarding the contribution of electrical energy to the free energy of transformation has yet to be justified [to the same extent that stress and magnetic fields have been incorporated into phase diagram calculations]. 4. That in phase mixtures, the variation in electrical resistivity or magnetic properties of the individual phases may determine the structural response to electropulsing. There evidently is a lot to be done, so the next step in the assessment of the field became obvious, to initiate a compilation of papers on the subject, with all those active in the field according to the knowledge databases, invited to contribute.

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Morphology and distribution control of MnS inclusions in molten steel by electropulsing

Cited by 13 publications

References 6 publications

Theory and Practice of Using Pulsed Electromagnetic Processing of Metal Melts

Theory and Practice of Using Pulsed Electromagnetic Processing of Metal Melts

Application of pulsed electric current in immiscible liquid and droplet processing

The Electrical Processing of Materials

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