Journal of Korea Foundry Society (한국주조공학회지)

Korea Foundry Society (한국주조공학회)
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A Study on the Microstructures and Mechanical Properties of Strip-Cast Ductile Cast Iron

스트립캐스팅한 구상흑연주철 박판의 미세조직과 기계적 성질에 관한 연구

  • Choi, Kyu-Taek (Division of Materials Science and Engineering, Seoul National University) ;
  • Park, Jae-Young (Division of Materials Science and Engineering, Seoul National University) ;
  • Ra, Hyung-Yong (Division of Materials Science and Engineering, Seoul National University)
  • 최규택 (서울대학교 공과대학 재료공학부) ;
  • 박재영 (서울대학교 공과대학 재료공학부) ;
  • 나형용 (서울대학교 공과대학 재료공학부)
  • Published : 1999.02.20
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Abstract

Strip casting process, a new casting technology which makes thin strip of $0.5{\sim}5\;mm$ thickness directly from molten metal, has been dramatically developed for past 10 years and faced commercialization in the case of STS304 strip. In this study, ductile cast iron strip which is 1.1 mm thick and 100 mm wide is manufactured by the twin roll strip caster. Graphite and matrix structure of the strip can be controlled through heat treatments and the mechanical properties are examined. The microstructure of the as-cast strip consists of cementite and pearlite. Especially the equiaxed crystal zone of pearlite exists in the center region of the thickness due to the characteristics of the strip casting process. Matrix structure can be transformed into fully ferrite or ferrite/pearlite mixed structures by the different graphitization heat treatments. The heat-treated strip with ferrite/pearlite matrix structure showed higher hardness and tensile strength than that with full ferrite matrix structure.

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