Kinetics and mechanical study of plasma electrolytic carburizing for pure iron

▶ This study was driven by the lack of studies on the plasma electrolytic surface carburizing of pure iron. ▶ At the present study, the pure iron samples were carburized in aqueous solution of 20% glycerin. ▶ The samples were carburized at 750°C, 800°C, 900°C and 950°C temperatures for 5, 10 and 30m...

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Bibliographic Details
Published in:	Applied surface science Vol. 257; no. 9; pp. 4014 - 4020
Main Authors:	Çavuşlu, F., Usta, M.
Format:	Journal Article
Language:	English
Published:	Amsterdam Elsevier B.V 15-02-2011 Elsevier
Subjects:	Aqueous solution Aqueous solutions Carburizing Condensed matter: electronic structure, electrical, magnetic, and optical properties Condensed matter: structure, mechanical and thermal properties Cross-disciplinary physics: materials science; rheology Exact sciences and technology Friction Hardness Iron Phases Physics Plasma electrolytic surface hardening Pure iron Surface roughness Wear resistance Pure iron Carburizing Aqueous solution Plasma electrolytic surface hardening Hardening Aqueous solutions Transition elements Iron Kinetics
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Summary:	▶ This study was driven by the lack of studies on the plasma electrolytic surface carburizing of pure iron. ▶ At the present study, the pure iron samples were carburized in aqueous solution of 20% glycerin. ▶ The samples were carburized at 750°C, 800°C, 900°C and 950°C temperatures for 5, 10 and 30min. ▶ The effect of temperature, time and the amount of glycerin on the kinetics of this process was evaluated. In this work, plasma electrolytic surface carburizing of pure iron in aqueous solution consisting of water, glycerin and NH4Cl was investigated. Surface carburizing was carried out in 20% glycerin solution treated at 750°C, 800°C, 900°C and 950°C temperatures for 5, 10 and 30min. The formation of hard carbon-rich layer on the surface of pure iron was confirmed by XRD analysis. Metallographic and SEM studies revealed a rough and dense carburized layer on the surface of the pure iron. Experimental results showed that the thickness of the carburized layers changes with the time and temperature. The average thickness of the carburized layer ranged from 20 to 160μm. The hardness of the carburized samples decreased with the distance from the surface to the interior of the test material. The average hardness values of the carburized layers on the substrate ranged 550–850HV, while the hardness of the substrate ranged from 110HV to 170HV. The dominant phases formed on the pure iron were found to be a mixture of cementite (Fe3C), martensite (Fe+C) and austenite (FCC iron) confirmed by XRD. Wear resistance in all plasma electrolytic carburized samples is considerably improved in relation to the untreated specimen. After carburizing, surface roughness of the samples was increased. Friction coefficients were also increased because of high surface roughness.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0169-4332 1873-5584
DOI:	10.1016/j.apsusc.2010.11.167