Journal of Korea Foundry Society (한국주조공학회지)

Korea Foundry Society (한국주조공학회)
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Effects of Alloying Elements on the Characteristics of Microstructure and High Temperature Oxidation of Cast Austenitic Stainless Steel

오스테나이트 스테인리스 주강의 미세 조직 및 고온 산화 특성에 미치는 합금원소의 영향

  • Lee, In-Sung (Department of Material Science and Engineering, Yonsei University) ;
  • Jeon, Soon-Hyeok (Department of Material Science and Engineering, Yonsei University) ;
  • Kim, Soon-Tae (Department of Material Science and Engineering, Yonsei University) ;
  • Lee, Jung-Suk (Advanced Technology Center, Hyundai.Kia Motors Corp.) ;
  • Ko, Young-Sang (Advanced Technology Center, Hyundai.Kia Motors Corp.) ;
  • Kim, Jong-Myoung (Advanced Technology Center, Hyundai.Kia Motors Corp.)
  • 이인성 (연세대학교 신소재공학과) ;
  • 전순혁 (연세대학교 신소재공학과) ;
  • 김순태 (연세대학교 신소재공학과) ;
  • 이정석 ((주) 현대.기아자동차 선행개발센터) ;
  • 고영상 ((주) 현대.기아자동차 선행개발센터) ;
  • 김종명 ((주) 현대.기아자동차 선행개발센터)
  • Received : 2010.08.30
  • Accepted : 2010.09.29
  • Published : 2010.10.31
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Abstract

To elucidate the effects of alloying elements on the characteristics of microstructure and high temperature oxidation of cast austenitic stainless steel, a thermodynamic calculation, a cyclic oxidation test, a X-ray diffraction, a scanning electron microscopy-back scattered electron, a electron probe microanalysis were conducted. The thermodynamic calculation for the effect of vanadium (V) addition on the formation of various precipitates leads to a decrease of chromium (Cr)-rich $M_{23}C_6$ carbides due to the formation of M (C, N) carbo-nitrides containing V and / or niobium (Nb). The V added alloy increased the resistance to high temperature oxidation due to a decrease of Cr-depleted zone deteriorating the oxidation resistance and due to the V-enriched oxide layer formed in inner oxide layer blocking the outward transport of cations.

Keywords

References

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