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

Mechanical Properties of Austempered Fe-2.0wt.%Si-0.3wt.%Mn Steel with various Carbon Contents

  • 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)
  • 투고 : 2015.01.07
  • 심사 : 2015.02.10
  • 발행 : 2015.02.28

초록

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.

키워드

참고문헌

  1. A. Nazarboland, R. Elliott, Materials Science and Technology, "Use of Austempering Temperature in Control of Austempering of Mn-Mo-Cu Alloyed Ductile Iron", 13 (1997) 1007-1015. https://doi.org/10.1179/mst.1997.13.12.1007
  2. D.C. Wen, T.S Lei, Material Transactions, "Influence of Tempering on the Mechanical Properties of Austempered Ductile Iron", 40 (1999) 980-988. https://doi.org/10.2320/matertrans1989.40.980
  3. N. Darwish, R. Elliot, Materials Science and Technology, "Austempering of low manganese ductile irons Part 3 Variation of mechanical properties with heat treatment conditions", 9 (1993) 882-889. https://doi.org/10.1179/mst.1993.9.10.882
  4. G.L. Greno, J.L. Otegui, R.E. Boeri, International Journal of Fatique, "Mechanisms of fatigue crack growth in Austempered Ductile Iron", 21 (1999) 35-43.
  5. Yanxiang Li, Xiang Chen, Materials Science and Engineering, "Microstructure and mechanical properties of austempered high silicon cast steel", A308 (2001) 277-282.
  6. Son JY, Kim JH, Kim WB and Ye BJ, Metals and Materials International, "Effects of austempering conditions on the microstructures and mechanical properties in Fe-0.9%C-2.3%Si-0.3%Mn steel", 16 (2010) 357-361. https://doi.org/10.1007/s12540-010-0603-9
  7. R.C. Voigt, Trans. AFS, "The Hardenability of Ductile Irons", 173 (1989) 915-938.
  8. B.D. Cullity, "Elements of X-ray Diffraction", Second ed. (1990).
  9. D.B Santos, R. Barbosa and E.V. Pereloma, ISIJ Int., "Mechanical Behavior and Microstructure of High Carbon Si-Mn-Cr Steel with Trip Effect", 49 (2009) 1592-1600. https://doi.org/10.2355/isijinternational.49.1592
  10. A.S. Hamid Ali, R. Elliott, Materials Science and Technology, "Influence of austenitising temperature on austempering of an Mn-Mo-Cu alloyed ductile iron Part 1-Austempering kinetics and the processing window", 12 (1996) 1021-1031. https://doi.org/10.1179/026708396790121982
  11. Shin SY, Lee DH, Kim SE and Ye BJ, J. Korea Foundry Society, "The Austempering Transformation Behavior of Fe-0.7wt.%C-2.3wt.%Si-0.3wt.%Mn Steel", 34 (2014) 1-5. https://doi.org/10.7777/jkfs.2014.34.1.001