Journal of Korea Foundry Society (한국주조공학회지)

Korea Foundry Society (한국주조공학회)
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Evaluation of Effects of Rare Earth Element and Cooling Rate on the Eutectic Reaction of Flake Graphite Cast Irons by Cooling Curve Analysis

냉각곡선 분석을 통한 편상흑연주철의 공정반응에 미치는 희토류원소 및 냉각속도의 영향 평가

  • Lee, Sang-Hwan (Liquid Processing & Casting Technology R&D Group, Korea Institute of Industrial Technology) ;
  • Park, Seung-Yeon (Liquid Processing & Casting Technology R&D Group, Korea Institute of Industrial Technology) ;
  • Lee, Sang-Mok (Liquid Processing & Casting Technology R&D Group, Korea Institute of Industrial Technology) ;
  • Kim, Myung-Ho (Metallurgical Engineering, Inha University)
  • 이상환 (한국생산기술연구원 주조공정연구그룹) ;
  • 박승연 (한국생산기술연구원 주조공정연구그룹) ;
  • 이상목 (한국생산기술연구원 주조공정연구그룹) ;
  • 김명호 (인하대학교 금속공학과)
  • Received : 2012.12.24
  • Accepted : 2013.02.06
  • Published : 2013.02.28
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Abstract

The effects of rare earth element (R.E.) and cooling rate on the eutectic reaction of flake graphite cast irons were studied by combined analysis of macro/micro-structure and cooling curve data. The correlation between eutectic reaction parameter and macro/micro-structure was systematically investigated. Two sets of chemical compositions with the different addition of R.E. were designed to cast. Three types of molds for cylindrical specimens with the different diameters were prepared to analyze cooling rate effect. The difference between undercooling temperature and cementite eutectic temperature (${\Delta}T_1=T_{U}-T_{E,C}$), which is increased by adding R.E. and decreased by increasing cooling rate, is considered to be a suitable eutectic reaction parameter for predicting graphite morphology. According to the criterion, A-type graphite is mainly suggested to form for ${\Delta}T_1$ over $20^{\circ}C$. Eutectic reaction time (${\Delta}t$), which is decreased by adding R.E. or increasing cooling rate, is a suitable eutectic reaction parameter for predicting eutectic cell size. Eutectic cell size is found to decrease in a proportion to the decrease of ${\Delta}t$.

Keywords

References

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