대한금속재료학회지 (Korean Journal of Metals and Materials)

  • 제50권8호
  • /
  • Pages.575-582
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  • 2012
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  • 1738-8228(pISSN)
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  • 2288-8241(eISSN)
대한금속재료학회 (The Korean Institute of Metals and Materials)
권호 표지
DOI QR코드

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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)
  • 투고 : 2012.03.03
  • 발행 : 2012.08.25
⟨ 이전 논문 다음 논문 ⟩

초록

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.

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과제정보

연구 과제 주관 기관 : Korea Institute of Energy Technology Evaluation and Planning (KETEP)

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