Critical Assessment 8: Outstanding issues in electropulsing processing

Qin, Rongshan

doi:10.1179/1743284714y.0000000630

Cited by 41 publications

(24 citation statements)

References 54 publications

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“…EPT has been used for auxiliary turning operations to enhance the plastic deformation and cutting performance of the workpiece [ 39 , 40 ]. In addition, electropulsing could induce the redistribution of particles in liquid suspensions and helps clean molten materials from insulating oxides [ 41 , 42 ] and electrically neutral non-metallic inclusions [ 43 ]. By combining EPT with other material processing techniques, such as conventional heat treatment [ 44 ], high energy electron beam treatment [ 45 ] and ultrasonic shock treatment [ 46 , 47 ], enhanced material properties and performance could be achieved, including improved dynamic ductility of alloys due to the formation of ultra-fine grains microstructure and higher surface quality of alloys [ 48 , 49 , 50 ].…”

Section: Introductionmentioning

confidence: 99%

Application of High-Density Electropulsing to Improve the Performance of Metallic Materials: Mechanisms, Microstructure and Properties

et al. 2018

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The technology of high-density electropulsing has been applied to increase the performance of metallic materials since the 1990s and has shown significant advantages over traditional heat treatment in many aspects. However, the microstructure changes in electropulsing treatment (EPT) metals and alloys have not been fully explored, and the effects vary significantly on different material. When high-density electrical pulses are applied to metals and alloys, the input of electric energy and thermal energy generally leads to structural rearrangements, such as dynamic recrystallization, dislocation movements and grain refinement. The enhanced mechanical properties of the metals and alloys after high-density electropulsing treatment are reflected by the significant improvement of elongation. As a result, this technology holds great promise in improving the deformation limit and repairing cracks and defects in the plastic processing of metals. This review summarizes the effect of high-density electropulsing treatment on microstructural properties and, thus, the enhancement in mechanical strength, hardness and corrosion performance of metallic materials. It is noteworthy that the change of some properties can be related to the structure state before EPT (quenched, annealed, deformed or others). The mechanisms for the microstructural evolution, grain refinement and formation of oriented microstructures of different metals and alloys are presented. Future research trends of high-density electrical pulse technology for specific metals and alloys are highlighted.

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Section: Introductionmentioning

confidence: 99%

Application of High-Density Electropulsing to Improve the Performance of Metallic Materials: Mechanisms, Microstructure and Properties

et al. 2018

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“…Electric current metallurgy utilizes electric current in alloys processing [1]. The system free energy in this situation consists of chemical free energy (G c ), interfacial energy (G i ), strainstress energy (G s ) and electric current free energy (G e ).…”

Section: Introductionmentioning

confidence: 99%

Computational thermodynamics in electric current metallurgy

Qin

Bhowmik

2015

Materials Science and Technology

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A priori derivation for the extra free energy caused by the passing electric current in metal is presented. The analytical expression and its discrete format in support of the numerical calculation of thermodynamics in electric current metallurgy have been developed. This enables the calculation of electric current distribution, current-induced temperature distribution and free energy sequence of various phase transitions in multiphase materials.The work is particularly suitable for the study of magnetic materials that contains various magnetic phases. The latter has not been considered in literature. The method has been validated against the analytical solution of current distribution and experimental observation of microstructure evolution. It provides a basis for the design, prediction and implementation of the electric current metallurgy. The applicability of the theory is discussed in the derivations.

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“…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:…”

Section: H K D H Bhadeshiamentioning

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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Critical Assessment 8: Outstanding issues in electropulsing processing

Cited by 41 publications

References 54 publications

Application of High-Density Electropulsing to Improve the Performance of Metallic Materials: Mechanisms, Microstructure and Properties

Application of High-Density Electropulsing to Improve the Performance of Metallic Materials: Mechanisms, Microstructure and Properties

Computational thermodynamics in electric current metallurgy

The Electrical Processing of Materials

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