Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Effect of Sulfur on the High-temperature Oxidation of Fe-34.4Cr-14.5Ni-2.5Mo-0.4W-0.4Mn-0.5Si Alloys

Fe-34.4Cr-14.5Ni-2.5Mo-0.4W-0.4Mn-0.5Si 합금의 고온 산화에 미치는 S의 영향

  • 이동복 (성균관대학교 신소재공학부) ;
  • 이경환 (신성대학교 제철산업과) ;
  • 배근수 (한국피아이엠 기술연구소) ;
  • 조규철 (한국피아이엠 기술연구소) ;
  • 정재옥 (한국피아이엠 기술연구소) ;
  • 김민정 (성균관대학교 신소재공학부)
  • Received : 2017.07.26
  • Accepted : 2017.10.11
  • Published : 2017.10.31
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Abstract

Two kinds of steels whose compositions were Fe-34.4Cr-14.5Ni-2.5Mo-0.4W-0.4Mn-0.5Si-(0.009 or 0.35)S (wt.%) were centrifugally cast, and oxidized at $900^{\circ}C$ for 50-350 h in order to find the effect of sulfur on the high-temperature oxidation of Fe-34.4Cr-14.5Ni-2.5Mo-0.4W-0.4Mn-0.5Si-(0.009 or 0.35)S (wt.%) alloys. These alloys formed oxide scales that consisted primarily of $Cr_2O_3$ as the major oxide and $Cr_2MnO_4$ as the minor one through preferential oxidation of Cr and Mn. They additionally formed $SiO_2$ particles around the scale/alloy interface as well as inside the matrices. The high affinity of Mn with S led to the formation of scattered MnS inclusions particularly in the 0.35S-containing cast alloy. Sulfur was harmful to the oxidation resistance, because it deteriorated the scale/alloy adherence so as to accerelate the adherence and compactness of the formed scales.

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References

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