Journal of Korea Foundry Society (한국주조공학회지)

Korea Foundry Society (한국주조공학회)
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Effects of Si Content and Austempering Conditions on Properties of High Carbon Cast Steel

고탄소강의 특성에 미치는 규소 함량 및 오스템퍼링 조건의 영향

  • Kim, Won-Bae (Dept. of Metallurgical Engineering, Kyungpook National University) ;
  • Kim, Myung-Sik (R&D Center, Korea Powertrain Co. Ltd.) ;
  • Kim, Jong-Chul (R&D Center, Hwashin Co. Ltd.) ;
  • Sohn, Ho-Sang (Dept. of Metallurgical Engineering, Kyungpook National University) ;
  • Ye, Byung-Joon (Dept. of Metallurgical Engineering, Kyungpook National University)
  • 김원배 (경북대학교 금속공학과) ;
  • 김명식 ((주)한국파워트레인 기술연구소) ;
  • 김종철 ((주)화신 기술연구소) ;
  • 손호상 (경북대학교 금속공학과) ;
  • 예병준 (경북대학교 금속공학과)
  • Published : 2005.04.20
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Abstract

This study has been carried out to investigate the microstructure of austempered high carbon cast steel with the variation of silicon and heat treatment conditions. The results show that an lower ausferritic structure is formed at the low austemepring temperature ($250{\sim}300^{\circ}C$) and an upper ausferritic structure is formed at the high austemepring temperature ($350{\sim}400^{\circ}C$). As an austempering temperature increased, the retained austenite volume fraction increased, however hardness decreased. Also, as a silicon content increased, the precipitation of cementite was suppressed, therefore 2nd reaction of autempering transformation was delayed.

Keywords

References

  1. J. K. Janowak : Modern Casting, 'Beyond the Metallurgical Mystique', 75, 1 (1985) 34-36
  2. G. L. Greno, J. L. Otegui, and R. E. Boeri : Int. J. Fat., 'Mechanisms of fatigue crack growth in austempered ductile iron', 21 (1999) 35-43
  3. R. C. Vogit, R. Bendaly, J. F. Janowak, and Y. J. Park : AFS Trans., 'Development of Austempered High Silicon Cast Steels', 93 (1987) 85-72
  4. Y. J. Park, R. B. Gundlach, and J. F. Janowak : AFS Trans., 'Monitoring the bainite reaction during austempering of ductile iron and high silicon cast steel by resistivity measurement', 95 (1987) 411-416
  5. Yanxiang Li, Xiang Chen : Mat. Sci. Eng., 'Microstructure and mechanical properties of austempered high silicon cast steel', 308 (2001) 277-282 https://doi.org/10.1016/S0921-5093(00)01779-2
  6. B. D. Culity : Elements of X-ray Diffraction, 2nd ed, Addison- Wesley Publication Company, Inc., Menlo Park,. (1990)
  7. O. J. Moncada and J. A. Sikora : AFS Trans., 'Dimensional change in austempered ductile iron', 147 (1996) 577-580
  8. T. S. Shin, P. Y. Lin, C. H. Chang, and C. R. Loper Jr. : AFS Trans., 'A Study of the Austempering of a Ni-Cu Alloyed Ductile Iron', 98 (1990) 609-630
  9. D. J. Moore, T. N. Rouns, and K. B. Rundman : AFS Trans., 'Structure and Mechanical Properties of Austempered Ductile Iron', 103 (1985) 705-718
  10. A. S. Hamid Ali, and R. Elliott : Mat. Sci. and Tech., 'Austempering of an Mn-Mo-Cu alloyed ductile iron Part 2-structure-mechanical property relationships', 12 (1996) 780-787 https://doi.org/10.1179/026708396790122404
  11. B. P. J. Sandvik : Met. Mat. Trans., A, 'The Bainite reaction in Fe-Si-C alloys: The primary stage', 13 (1982) 777-787 https://doi.org/10.1007/BF02642391
  12. G. J. Cox : Br. Foundryman, 76, 6 (1986) 215
  13. Susil K. Putatunda : Mat. Sci. Eng., 'Fracture toughness of a high carbon and high silicon steel', 297 (2001) 31-43 https://doi.org/10.1016/S0921-5093(00)01272-7
  14. J. C. Kim and B. J. Ye : J. Kor. Foundrymen's Soc., 'Transformation and Processing Window of Austempered Ductile Iron', 22 (2002) 97-89