Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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A Study on Surface Properties in SUS 300 base Stainless Steel

SUS 300계 스테인리스강의 표면특성에 관한 연구

  • Lee, K.K. (Dept. of Iron & Metallurgical Engineering, Hanlyo University) ;
  • Yoon, D.J. (Dept. of Iron & Metallurgical Engineering, Hanlyo University) ;
  • Ghi, W.B. (Dept. of Metallurgical Engineering, Chonnam National University) ;
  • Choi, D.C. (Dept. of Metallurgical Engineering, Chonnam National University) ;
  • Lee, D.J. (Dept. of Metallurgical Engineering, Chonnam National University)
  • 이경구 (한려대학교 제철금속학과) ;
  • 윤동주 (한려대학교 제철금속학과) ;
  • 기회봉 (전남대학교 공과대학 금속공학과) ;
  • 최답천 (전남대학교 공과대학 금속공학과) ;
  • 이도재 (전남대학교 공과대학 금속공학과)
  • Published : 1999.03.31
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Abstract

In the present study, oxidation behavior of 304 and 316 stainless steels was investigated. After solution treatment, specimens were polished up to $1{\mu}m$ $Al_2O_3$ grade and then subjected to oxidation treatment in dry air. The range of temperature was used for oxidation treatment at $300^{\circ}C{\sim}500^{\circ}C$ and TEM was used for analyzing the components and structure of oxide film. Also, these results were compared with the results of ESCA and TG. According to the results of TEM analysis, it was found that Cr oxide film was formed on top of the surface after room temperature oxidation but amorphous Fe oxide was formed on top of the surface and polycrystalline $(Cr,Fe)_2O_3$ was formed below the amorphous Fe oxide layer after $500^{\circ}C$ oxidation treatment. The oxidized specimens at $500^{\circ}C$ showed that 316 stainless steel resists more strongly to grain and grain boundary oxidation than 304 stainless steel. These results suggested that Mo component resolved in 316 stainless steel matrix suppressed the formation of Cr carbide which may results in local Cr deplete area.

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Acknowledgement

Supported by : 포항제철