Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Characterization of Microstructure, Hardness and Oxidation Behavior of Carbon Steels Hot Dipped in Al and Al-1 at% Si Molten Baths

  • Trung, Trinh Van (School of Materials Science and Engineering, University of Ulsan) ;
  • Kim, Sun Kyu (School of Materials Science and Engineering, University of Ulsan) ;
  • Kim, Min Jung (School of Advanced Materials Science and Engineering, Sungkyunkwan University) ;
  • Kim, Seul Ki (School of Advanced Materials Science and Engineering, Sungkyunkwan University) ;
  • Bong, Sung Jun (School of Advanced Materials Science and Engineering, Sungkyunkwan University) ;
  • Lee, Dong Bok (School of Advanced Materials Science and Engineering, Sungkyunkwan University)
  • Received : 2012.03.03
  • Published : 2012.08.25
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Abstract

Medium carbon steel was aluminized by hot dipping into molten Al or Al-1 at% Si baths. After hot-dipping in these baths, a thin Al-rich topcoat and a thick alloy layer rich in $Al_5Fe_2$ formed on the surface. A small amount of FeAl and $Al_3Fe$ was incorporated in the alloy layer. Silicon from the Al-1 at% Si bath was uniformly distributed throughout the entire coating. The hot dipping increased the microhardness of the steel by about 8 times. Heating at $700-1000^{\circ}C$, however, decreased the microhardness through interdiffusion between the coating and the substrate. The oxidation at $700-1000^{\circ}C$ in air formed a thin protective ${\alpha}-Al_2O_3$ layer, which provided good oxidation resistance. Silicon was oxidized to amorphous silica, exhibiting a glassy oxide surface.

Keywords

Acknowledgement

Supported by : Korea Institute of Energy Technology Evaluation and Planning (KETEP)

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