Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Effect of Quenching Medium on the Mechanical Properties of ADI Treated GCD 50

GCD 50의 ADI처리시 기계적 성질에 미치는 퀜칭 매질의 영향

  • Kim, H.G. (Division of Advanced Material Science and Eng., Pukyong National university) ;
  • Oh, I.S. (Division of Advanced Material Science and Eng., Pukyong National university) ;
  • Kim, H.J. (Division of Advanced Material Science and Eng., Pukyong National university) ;
  • Shin, K.G. (Division of Advanced Material Science and Eng., Pukyong National university)
  • 김한군 (부경대학교 신소재공학부) ;
  • 오이식 (부경대학교 신소재공학부) ;
  • 김헌주 (부경대학교 신소재공학부) ;
  • 신기근 (부경대학교 신소재공학부)
  • Received : 2008.03.21
  • Accepted : 2008.04.19
  • Published : 2008.05.31
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Abstract

Effect of quenching medium on the mechanical properties of ductil iron GCD 50 has been investigated using ADI treated specimens. The specimens have been austenitized at $900^{\circ}C$ for 2 hours, followed by controlled cooling to $800^{\circ}C$ under the cooling rate of $0.05^{\circ}C/sec$, then austempered at $380^{\circ}C$, $330^{\circ}C$, $280^{\circ}C$ and $230^{\circ}C$ for 1 hour. The specimens treated in the salt of 5% water were found to have higher tensile strength than that of the normal salt bath. Elongation and impact energy increased in proportion to the increase of retained austenite volume fraction. The increase of cooling rate of the salt by the addition of 5% water to the salt resulted in the increase of retained austenite volume fraction and the formation of fine bainitic ferrite.

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References

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