Journal of Korea Foundry Society (한국주조공학회지)

Korea Foundry Society (한국주조공학회)
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Mechanical Properties of Austempered Fe-2.0wt.%Si-0.3wt.%Mn Steel with various Carbon Contents

탄소함량 변화에 따른 오스템퍼드 Fe-2.0wt.%Si-0.3wt.%Mn 강의 기계적 성질

  • Ha, Jong-Gyu (Depatment of Metallurgical Engineering Graduate School of Kyungpook National University) ;
  • Shin, Sang-Yun (Depatment of Metallurgical Engineering Graduate School of Kyungpook National University) ;
  • Lee, Do-Hoon (Depatment of Metallurgical Engineering Graduate School of Kyungpook National University) ;
  • Ye, Byung-Joon (Depatment of Metallurgical Engineering Graduate School of Kyungpook National University)
  • Received : 2015.01.07
  • Accepted : 2015.02.10
  • Published : 2015.02.28
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Abstract

In this study, we investigated the effect of carbon on mechanical properties with different austempering conditions of high carbon(0.7~1.3wt.%C)-2.0wt.%Si steels. The specimens were austenitized at 850, 925 and $1020^{\circ}C$, and austempered at 260, 320 and $380^{\circ}C$ for the various period of time from 3 min to 300 min. After heat treatment, the evolution of stage I and stage II was identified with optical microscope, XRD and hardness test. When the austempering temperature was $260^{\circ}C$, the microstructure consisted of the lower ausferrite while the upper ausferrite micro-structure was formed at $380^{\circ}C$. As the austempering temperature increases from 260 to $380^{\circ}C$, the tensile strength decreases and elongation increases. In addition, when carbon content increases, tensile strength and elongation decrease.

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References

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