Metals and materials international

The Korean Institute of Metals and Materials (대한금속재료학회)
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Kinetics of Fe2Al5 Phase Formation on 4130 Steel by Al Pack Cementation and Its Oxidation Resistance

  • Son, Y.I. (Agency for Defense Development) ;
  • Chung, C.H. (Hanbat National University, Department of Materials Science & Engineering) ;
  • Gowkanapalli, R.R. (Hanbat National University, Department of Materials Science & Engineering) ;
  • Moon, C.H. (Hoseo University, School of Display Engineering) ;
  • Park, J.S. (Hanbat National University, Department of Materials Science & Engineering)
  • Received : 2014.05.01
  • Accepted : 2014.06.03
  • Published : 2015.01.20
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Abstract

Aluminide coatings were developed on low alloy AISI 4130 steel in the temperature range of $500{\sim}700^{\circ}C$ by pack cementation method. A $Fe_2Al_5$ phase was produced on the surface of the steel samples. The coating layer showed a single and a uniform structure. The growth kinetics of the coating layer exhibited a diffusional growth. The activation energy for formation of $Fe_2Al_5$ was estimated to be $53.7kJ\;mol^{-1}$. Oxidation tests were carried out for both the aluminized and the bare steels in the temperature range of $500{\sim}700^{\circ}C$. In the case of the coated specimens, the upper region of the aluminide layer was converted to an $Al_2O_3$ layer. The oxidation resistance tests showed that the presence of $Fe_2Al_5$ layer increased the oxidation resistance of AISI 4130 steels via formation of the $Al_2O_3$ layer. The coated specimen exhibited an increased oxidation resistance by about two orders. The kinetics of the coating layer has also been discussed in terms of microstructural observations and estimation of the corresponding parameters.

Keywords

Acknowledgement

Supported by : National Research Foundation of Korea (NRF)

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