Effects of current pulses on crack propagation kinetics in silicon iron

Golovin, Yu. I.; Finkel, V. M.; Sletkov, A. A.

doi:10.1007/bf01528386

Cited by 11 publications

(5 citation statements)

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“…Golovin [1] demonstrated that the current pulse has a significant effect on the dynamic propagation of cracks through ingenious experience. The possibility of crack arrest by electropulsing was firstly proposed.…”

Section: Introductionmentioning

confidence: 99%

“…Arresting crack propagation or healing crack is recommended for practical applications, especially in aerospace manufacturing technology. It has been shown that grain boundaries, shock waves and thermal stresses can block the crack propagation [1]. Further, cold expansion [2,3], laser welding [4,5], artificial wedge infiltration [6,7] and electropulsing treatment [8] are common methods for crack arrest.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure characterization and thermal behavior around crack tip under electropulsing

et al. 2015

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Electropulsing treatment is a practical method to arrest crack propagation. The microstructure characterization and research on the forming mechanism are difficult due to the small affected area (0.01-1 mm 2 ), high-temperature gradient (10 2 K/mm) and change rate (10 4 -10 7 K/ s). In this paper, the 1045 steel plate with a preexisting crack subjected to high-voltage pulses was investigated. The surface morphologies and microstructure around the crack tip were observed using optical microscopy and scanning electron microscopy. Experimental results showed that the material around the tip melted, splashed and blunted under electropulsing treatment. The microstructure around the molten hole was divided into four distinct regions. An electro-thermal coupled model considering material ejection, cavity formation, current oscillation and temperature-dependent material properties was proposed to investigate the dynamic formation process of molten hole and gradient microstructure. The uneven temperature distribution, high cooling rate and insufficient carbon diffusion led to the formation of gradient microstructure.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructure characterization and thermal behavior around crack tip under electropulsing

et al. 2015

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“…In the microcrack arrest method, the pulsed current concentrates at the tip of the crack in the material during the instantaneous energisation process, thereby inducing a thermal concentration effect and suppressing the propagation of microcracks. In 1975, Golovin et al [23] first discovered that the thermal concentration effect induced by a pulsed current can suppress the propagation of microcracks. Finkel et al [24] subsequently surveyed the impact of pulsed current on the microcrack arrest process and developed a mathematical model to describe the quantitative relationships between the pulsed current and the pulsed-current-induced electromagnetic, temperature, and elastic fields.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cerium and Magnesium on Surface Microcracks of Al–20Si Alloys Induced by High-Current Pulsed Electron Beam

Gao

et al. 2022

Coatings

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The effect of Ce and Mg on surface microcracks of Al–20Si alloys induced via high-current pulsed electron beam (HCPEB) was studied. Mg was revealed to refine the primary Si phase in the pristine microstructure by forming a Mg2Si phase, leading to the suppression of microcrack propagation within the brittle phase after HCPEB irradiation. The incorporation of Ce into the Al–Si–Mg alloys further refined the primary Si phase and reduced the local stress concentration in the brittle phase induced by HCPEB irradiation. Ultimately, the surface microcracks were observed to be eliminated by the synergistic effects between the two elements. For Al–20Si–5Mg–0.7Ce alloys, Ce demonstrated a homogeneous distribution in the Al matrix on the HCPEB-irradiated alloy surface, while the Mg and Si exhibited a certain degree of aggregation in the Mg2Si phase. Metastable structures were formed on the HCPEB-irradiated alloy surface, including the nano-primary silicon phase, nano-cellular aluminium structure, and nano-Mg2Si phase. Compared with alloy specimens containing Mg, the Al–20Si–5Mg–0.7Ce alloy specimens exhibited an excellent anticorrosion property after HCPEB irradiation mainly due to the combined effects of the grain refinement and microcrack elimination.

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“…Troitskii [7] first proposed the electro-plastic effect of metals in 1963. In 1975, Golovin et al [8] applied electric pulses to conductive thin plates, resulting in thermal concentration at the crack tip, and first proposed the possibility that crack propagation can be suppressed due to the thermal effect of pulse current. Misra [9,10] first used the current treatment technology in the solidification process of the hypereutectic alloy, Pb-15%Sb-7%Sn, and the hypoeutectic, Pb-10%Sb-3%Sn alloy.…”

Section: Introductionmentioning

confidence: 99%

Effect of Electric Pulse Current Rapid Aging Treatment on Microstructure and Properties of Al-7Si-0.55Mg Alloy

Kang

Gao

et al. 2019

Metals

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A rapid aging treatment method of Al-7Si-0.55Mg alloy using electric pulse, namely electric pulse aging treatment, is explored in this study. The effect of electric pulse assisted aging on microstructure and properties of Al-7Si-0.55Mg alloy are investigated by means of optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), tensile tests and hardness tests. The results show that the microstructure of the Al-7Si-0.55Mg alloy is effectively refined, and the morphology of eutectic Si changes from long and thin strip to a spherical shape or short rod. The elongation of the Al-7Si-0.55Mg alloy is significantly improved after electric pulse assisted aging, albeit it did slightly compromise the tensile strength. It is important to reduce the aging time by 3 h, saving energy. According to classical nucleation theory, the formula of the phase nucleation rate promoted by an electric pulse was determined. The application of an electric pulse can accelerate the nucleation of phase transformation by decreasing the thermodynamic energy barrier, which increases the nucleation rate and significantly improves the properties of the alloy. It provides an experimental and theoretical basis for the Al-7Si-0.55Mg alloy to obtain good mechanical properties and industrial applications.

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Effects of current pulses on crack propagation kinetics in silicon iron

Cited by 11 publications

References 0 publications

Microstructure characterization and thermal behavior around crack tip under electropulsing

Microstructure characterization and thermal behavior around crack tip under electropulsing

Effect of Cerium and Magnesium on Surface Microcracks of Al–20Si Alloys Induced by High-Current Pulsed Electron Beam

Effect of Electric Pulse Current Rapid Aging Treatment on Microstructure and Properties of Al-7Si-0.55Mg Alloy

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