Effect of electropulsing on the formation of graphite during solid-state graphitization of spherical graphite iron

Li, Qingchun; Li, Renxing; Yue, Xu-dong; Chang, Guowei; Zhai, Qijie

doi:10.1016/j.matchemphys.2008.05.073

Cited by 5 publications

(2 citation statements)

References 24 publications

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“…In the process treatment of HCCI, pulse current treatment is an effective method to refine carbide without changing the composition of the material. Moreover, this technology offers characteristics of non-pollution to the environment, low cost of preparation and simple operation, attracting a lot of interest in the effect of pulse current treatment on microstructure evolution [15,16,17,18,19,20,21,22]. In the case of hypereutectic HCCI, our previous investigation revealed that obvious refinement effect of primary carbides is observed after pulse current treatment at 45 Hz [23].…”

Section: Introductionmentioning

confidence: 99%

Effect of Electric Current Pulse on Microstructure and Corrosion Resistance of Hypereutectic High Chromium Cast Iron

Zhou

et al. 2018

Materials

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The effect of electric current pulse on the microstructure and corrosion resistance of hypereutectic high chromium cast iron was explored. The morphology of carbides in solidification microstructure was observed by an optical microscope and a scanning electron microscope and the composition was determined by an electron probe micro-analyzer. The microhardness of primary carbides and corrosion resistance of samples were also compared. Under the active of electric current pulse, the microstructure of hypereutectic high chromium cast iron was homogenized and its performance improved accordingly. On treatment by electric current, the morphology of primary carbides changed from thick long rods to hexagonal blocks or granular structures. The interlayer spacing of eutectic carbide decreased from ~26.3 μm to ~17.8 μm. Size statistics showed that the average diameter of primary carbide decreased from ~220 μm to ~60 μm. As a result, microhardness increased from 1412 HV to 1511 HV. No obvious microcrack propagation was found at the microindentation sites. The average length of microcracks decreased from ~20.7 μm to ~5.7 μm. Furthermore, corrosion resistance was remarkably enhanced. The average corrosion rate decreased from 2.65 mg/cm2·h to 1.74 mg/cm2·h after pulse current treatment.

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Section: Introductionmentioning

confidence: 99%

Effect of Electric Current Pulse on Microstructure and Corrosion Resistance of Hypereutectic High Chromium Cast Iron

Zhou

et al. 2018

Materials

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“…The researches made by Samuel [6] 、Tanaka S [7] , He Lijia [8] et al reveal that electropulsing can accelerate the atom diffusion in solid state metal. The researches of Li Qingchun [9,10] reveal that electropulsing can strengthen the diffusing capacity of carbon atom in γ phase, reduce the nucleation potential barrier of graphite, and increase the nucleation rate of graphite. It is revealed in Yu Wenpeng [11] 's researches that current impulse can reduce the nucleation potential barrier of α phase, and enhance the nucleation rate of α phase.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Influence of Electropulsing to Microstructural Evolution of Billet

Zhu¹,

Wang²,

Zhou³

2012

Proceedings of the 2nd International Conference on Electronic and Mechanical Engineering and Information Technology (2012)

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Abstract. This paper studies the influence to the microstructural evolution of low carbon steel and low carbon Nb steel through experiments in order to improve the microstructure of billet. The results of the study show that electropulsing has significant impact on the phase transformation from austenite to ferrite of low carbon steel and low carbon Nb steel, which improves nucleation rate of ferrite inside austenite grain. And it also shows that electropulsing promotes the nucleation and precipitation of NbCN in low carbon Nb steel and a large number of NbCN particles provide the nucleation sites for austenitic → ferritic phase transformation, which improves nucleation rate of ferrite inside austenite grain. The improvement of nucleation rate of ferrite inside austenite grain effectively restrains the formation of pro-eutectoid ferrite omentum at austenitic grain boundaries.

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Microstructure and Wear Behavior of High-Carbon Concentration CrCoNi Multi-principal Element Alloys

Bertoli

Koga

Puosso

et al. 2021

Metall Mater Trans A

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Effect of electropulsing on the formation of graphite during solid-state graphitization of spherical graphite iron

Cited by 5 publications

References 24 publications

Effect of Electric Current Pulse on Microstructure and Corrosion Resistance of Hypereutectic High Chromium Cast Iron

Effect of Electric Current Pulse on Microstructure and Corrosion Resistance of Hypereutectic High Chromium Cast Iron

Experimental Study on Influence of Electropulsing to Microstructural Evolution of Billet

Microstructure and Wear Behavior of High-Carbon Concentration CrCoNi Multi-principal Element Alloys

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