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Materials 2018, 11(11), 2220; https://doi.org/10.3390/ma11112220

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

1
College of Materials and Chemical Engineering, Chongqing University of Arts and Sciences, Chongqing 402160, China
2
College of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
3
Research Institute for New Materials Technology, Chongqing University of Arts and Sciences, Chongqing 402160, China
*
Author to whom correspondence should be addressed.
Received: 3 October 2018 / Revised: 5 November 2018 / Accepted: 5 November 2018 / Published: 8 November 2018
(This article belongs to the Special Issue Advanced Technology for Materials Synthesis and Processing)
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Abstract

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. View Full-Text
Keywords: electric current pulse; high chromium cast iron; primary carbide; morphology; corrosion resistance electric current pulse; high chromium cast iron; primary carbide; morphology; corrosion resistance
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Lv, H.; Zhou, R.; Li, L.; Ni, H.; Zhu, J.; Feng, T. Effect of Electric Current Pulse on Microstructure and Corrosion Resistance of Hypereutectic High Chromium Cast Iron. Materials 2018, 11, 2220.

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