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2025 Vol.35, Issue 12 Preview Page

Special Issue KIMS - Research Paper

Design of a Ferritic Heat-Resistant Alloy with Improved Corrosion Resistance and Ductility

우수한 부식 저항성과 연성을 갖는 페라이트계 내열 합금 설계

Ka Ram Lim1†
임 가람1†
1Extreme Materials Research Institute, Korea Institute of Materials Science, Changwon 51508, Republic of Korea
1한국재료연구원 극한재료연구소
†Corresponding author E-Mail : krlim@kims.re.kr (K. R. Lim, KIMS)
27 December 2025. pp. 656-663
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Abstract

High-entropy alloys (HEA) have emerged as promising structural materials for use in extreme environments where conventional alloys face limitations. In this study, ferritic Fe-Al-Cr-Ni-Ti alloys were developed by employing the HEA design concept to promote coherent L21 precipitation within a BCC matrix. The systematic variation of Al content enhanced lattice coherency, precipitation strengthening, and the rapid formation of protective Al2O3 scales. The alloy with 16 at% Al exhibited superior high-temperature mechanical performance, showing a yield strength of approximately 400 MPa and ~5 % uniform elongation at 700 °C, exceeding the use temperature limit of conventional steels. Steam oxidation tests demonstrated the formation of dense, continuous alumina films, while hot rolling and grain refinement effectively improved room-temperature ductility. These findings indicate that Fe-Al-Cr-Ni-Ti alloys offer a cost-effective pathway to achieve a balanced combination of heat resistance, corrosion resistance, and mechanical processability, suggesting their potential as strong candidates for next-generation energy and high-temperature structural applications.

Keywords
corrosion-resistant
heat-resistant
ferritic superalloy
alumina-forming
molten salt reactor
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Information
  • Publisher :Materials Research Society of Korea
  • Publisher(Ko) :한국재료학회
  • Journal Title :Korean Journal of Materials Research
  • Journal Title(Ko) :한국재료학회지
  • Volume : 35
  • No :12
  • Pages :656-663
  • Received Date : 2025-09-29
  • Revised Date : 2025-11-02
  • Accepted Date : 2025-11-04
  • DOI :https://doi.org/10.3740/MRSK.2025.35.12.656
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