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Metals 2019, 9(2), 190; https://doi.org/10.3390/met9020190

Investigation of Microstructure, Nanohardness and Corrosion Resistance for Oxi-Nitrocarburized Low Carbon Steel

1
School of Materials Science and Engineering, Pusan National University, Busan 46241, Korea
2
Korea Clad Tech Co. Ltd., Guji-myeon, Dalseong-gun, Daegu 48013, Korea
*
Author to whom correspondence should be addressed.
Received: 12 January 2019 / Revised: 1 February 2019 / Accepted: 2 February 2019 / Published: 6 February 2019
(This article belongs to the Special Issue Surface Treatment Technology of Metals and Alloys)
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Abstract

A role of oxi-nitrocarburizing technique for low-carbon steel was intensively evaluated as a means of reducing the problem of corrosion in gas nitrocarburizing, which is a vital disadvantage of gas nitrocarburizing. Oxi-nitrocarburizing was carried out by a two-step process: Gas nitrocarburizing at 560 °C and oxidation. In order to characterize two different methods of oxi-nitrocarburizing, oxidation was performed under two different conditions: Air and steam as oxygen sources. To analyze the microstructural, physical, and chemical properties of the thin oxide layer and nitride layer, which are the surface hardened layers formed on low-carbon steel by oxi-nitrocarburizing, several methods, such as electron probe microanalysis (EPMA), electron backscattered diffraction (EBSD), scanning electron microscopy (SEM), nanoindentation tests, and potentiodynamic polarization tests were applied. The results indicated that the EPMA and EBSD methods are powerful techniques for the analysis of microstructure, such as phase analysis and metallic element distribution in the oxide layer of magnetite and compound layer of ε-phase and γ′-phase, for oxi-nitrocarburized low-carbon steel. Additionally, the nanohardness using the nanoindentation test and corrosion resistance using the potentiodynamic polarization test for the oxi-nitrocarburized specimens are useful methods to understand the mechanical and corrosion properties of the surface hardened layer. View Full-Text
Keywords: oxi-nitrocarburizing; low-carbon steel; microstructure; nanoindentation; corrosion resistance oxi-nitrocarburizing; low-carbon steel; microstructure; nanoindentation; corrosion resistance
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Cho, Y.-W.; Kang, Y.-J.; Baek, J.-H.; Woo, J.-H.; Cho, Y.-R. Investigation of Microstructure, Nanohardness and Corrosion Resistance for Oxi-Nitrocarburized Low Carbon Steel. Metals 2019, 9, 190.

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