Journal of Korea Foundry Society (한국주조공학회지)

Korea Foundry Society (한국주조공학회)
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Effect of Rare Earth Elements on the Microstructures of Thin-Wall Ductile Iron Castings

희토류원소에 의한 박육구상흑연주철품의 조직변화

  • Kim, Ji-Yeong (Department of Metallugical Engineering,Dong-A University) ;
  • Choi, Jun-Oh (Department of Metallugical Engineering,Dong-A University) ;
  • Park, Sung-Tak (Department of Metallugical Engineering,Dong-A University) ;
  • Han, Yun-Sung (Department of Metallugical Engineering,Dong-A University) ;
  • Choi, Chang-Ock (Department of Metallugical Engineering,Dong-A University)
  • 김지영 (동아대학교 금속재료 화학공학부) ;
  • 최준오 (동아대학교 금속재료 화학공학부) ;
  • 박성택 (동아대학교 금속재료 화학공학부) ;
  • 한윤성 (동아대학교 금속재료 화학공학부) ;
  • 최창옥 (동아대학교 금속재료 화학공학부)
  • Published : 2003.08.20
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Abstract

The effect of rare earth elements (R.E)(from 0.0 to 0.04%) on the microstructure formation and mechanical properties of thin-wall ductile iron castings were investigated. Tensile strength and hardness were decreased with an addition of up to 0.03% rare-earth elements. After addition of more than 0.03%, those were increased. Graphite nodule sizes were the finest, nodule count was the highst regardless of thickness and volume fraction of ferrite was the largest when that was 0.02%. However, the nodule count was decreased with increasing R.E. Futhermore. nodule size increased with increasing thickness and the volume fraction of ferrite decreased as that was increased. Nodularity was increased regardless of the thickness as that was increased. The castings of minium thickness up to 3 mm was possible without the formation of chill.

Keywords

References

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