Corrosion Science and Technology

  • 제23권1호
  • /
  • Pages.11-19
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  • 2024
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  • 1598-6462(pISSN)
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  • 2288-6524(eISSN)
한국부식방식학회 (The Corrosion Science Society of Korea)
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Corrosion Behavior of Fe-Ni Bainitic Steel Through an Inverted Austempering Multi-Step Process for Weathering Steel Applications

  • Miftakhur Rohmah (Research Center for Metallurgy, National Research and Innovation Agency (BRIN)) ;
  • Gusti Umindya Nur Tajalla (Department of Materials and Metallurgical Engineering, Institut Teknologi Kalimantan) ;
  • Gilang Ramadhan (Department of Materials and Metallurgical Engineering, Institut Teknologi Kalimantan) ;
  • Yunita Triana (Department of Materials and Metallurgical Engineering, Institut Teknologi Kalimantan) ;
  • Efendi Mabruri (Research Center for Metallurgy, National Research and Innovation Agency (BRIN))
  • 투고 : 2023.02.07
  • 심사 : 2023.06.07
  • 발행 : 2024.02.29
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초록

A Fe-Ni Bainitic steel as a weathering steel application was developed by combining its excellent mechanical properties and corrosion resistance in maritime environments. Nickel concentration (0.4-3 wt%) and inverted austempering multi-step (IAM) process were primary determinants of the microstructure of the Fe-Ni Bainitic steel. The initial austempering steel was performed at 300 ℃ for 600 seconds to obtain a partly bainitic transformation. The steel was heated again for 1800 s at 450 ℃. The microstructure was comprised of ferrite, a blocky martensite/austenite island, and a homogeneous lath-shape bainite structure with widths ranging from 4.67 to 6.89 ㎛. The maximum strength, 1480 MPa, was obtained with 3 wt% nickel. In this study, corrosion behavior was investigated utilizing potentiodynamic and electrochemical impedance spectroscopy (EIS) tests. A higher nickel content in Fe-Ni Bainitic steel refined the grain size, improved the bainite fraction, lowered the corrosion rate to 0.0257 mmpy, and increased the charge transfer of film resistance to 1369 Ω.

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과제정보

All authors thank to Research Center for Metallurgy - BRIN for Funding supports and laboratory facilities

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