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Evaluation of Effects of Rare Earth Element and Cooling Rate on the Eutectic Reaction of Flake Graphite Cast Irons by Cooling Curve Analysis

냉각곡선 분석을 통한 편상흑연주철의 공정반응에 미치는 희토류원소 및 냉각속도의 영향 평가

  • Lee, Sang-Hwan (Liquid Processing & Casting Technology R&D Group, Korea Institute of Industrial Technology) ;
  • Park, Seung-Yeon (Liquid Processing & Casting Technology R&D Group, Korea Institute of Industrial Technology) ;
  • Lee, Sang-Mok (Liquid Processing & Casting Technology R&D Group, Korea Institute of Industrial Technology) ;
  • Kim, Myung-Ho (Metallurgical Engineering, Inha University)
  • 이상환 (한국생산기술연구원 주조공정연구그룹) ;
  • 박승연 (한국생산기술연구원 주조공정연구그룹) ;
  • 이상목 (한국생산기술연구원 주조공정연구그룹) ;
  • 김명호 (인하대학교 금속공학과)
  • Received : 2012.12.24
  • Accepted : 2013.02.06
  • Published : 2013.02.28

Abstract

The effects of rare earth element (R.E.) and cooling rate on the eutectic reaction of flake graphite cast irons were studied by combined analysis of macro/micro-structure and cooling curve data. The correlation between eutectic reaction parameter and macro/micro-structure was systematically investigated. Two sets of chemical compositions with the different addition of R.E. were designed to cast. Three types of molds for cylindrical specimens with the different diameters were prepared to analyze cooling rate effect. The difference between undercooling temperature and cementite eutectic temperature (${\Delta}T_1=T_{U}-T_{E,C}$), which is increased by adding R.E. and decreased by increasing cooling rate, is considered to be a suitable eutectic reaction parameter for predicting graphite morphology. According to the criterion, A-type graphite is mainly suggested to form for ${\Delta}T_1$ over $20^{\circ}C$. Eutectic reaction time (${\Delta}t$), which is decreased by adding R.E. or increasing cooling rate, is a suitable eutectic reaction parameter for predicting eutectic cell size. Eutectic cell size is found to decrease in a proportion to the decrease of ${\Delta}t$.

Keywords

References

  1. Loria EA, Iron Age, "How Machinable are the Cast Irons?", 172 (1953) 158-161.
  2. Janowak JF and Gundlach RB, AFS Trans., "Improved Machinability of High Strength Gray Iron", 93 (1985) 961-968.
  3. Millet P, Schaller R and Benoit W, J. Phys. Colloques, "High Damping in Grey Cast Iron", 46 (1985) 405-408.
  4. Bates CF, Modern Casting, "Study Examines Influences on Machinability of Iron Castings", 86 (1996) 36-39.
  5. Burke CM, Moore DJ, Parolini JR, Rundman KB and Waarala D, AFS Trans., "Machinalbility of Gray Cast Iron: A Drilling Study", 107 (1999) 567-575.
  6. O'Rourke R and Grander M, Gear Tech., "Cast Iron: A Solid Choice for Reducing Gear Noise", 16 (1999) 46-49.
  7. Murakami T, Inoue T, Shimura H, Nakano M and Sasaki S, Mater. Sci. Eng. A, "Damping and Tribological Properties of Fe-Si-C Cast Iron Prepared Using Various Heat Treatments", 432 (2006) 113-119. https://doi.org/10.1016/j.msea.2006.06.090
  8. Collini L, Nicoletto G and Konecna R, Mater. Sci. Eng. A, "Microstructure and Mechanical Properties of Pearlitic Gray Cast Iron", 488 (2008) 529-539. https://doi.org/10.1016/j.msea.2007.11.070
  9. Nakae H and Fujimoto K, Key Eng. Mater., "Influence of Ti on Graphite Morphological Transition in Flake Graphite Cast Iron", 457 (2011) 25-30.
  10. Tanaka K, Okamura T and Satou T, J. Jpn. Foundry Eng. Soc., "Thin Wall and Lightweight Cylinder Block Production Technology", 73 (2001) 527-533.
  11. Fritsche E, Giesserei-Rundschau, "Energy Efficiency and $CO_2$ Emissions - Manufacture of Crankcases Made of Cast Iron versus Aluminium Alloy", 56 (2009) 160-164.
  12. Kowata T, Horie H, Hiratsuka S and Sato E, J. Jpn. Foundry Eng. Soc., "Effects of Rare Earth Elements on Chilling Tendency and Mechanical Properties of Flake Graphite Cast Irons with Different Carbon Equivalents", 68 (1996) 865-869.
  13. Kanno T, Kang I, Mizuki T and Nakae H, J. Jpn. Foundry Eng. Soc., "Effects of S, Mn and R.E. on Eutectic Temperature of Cast Iron", 73 (2001) 441-446.
  14. Lee SH, Hiratsuka S, Horie H, Kowata T and Choi CO, J. Jpn. Foundry Eng. Soc., "Effect of Rare Earth/Sulfur Ratio on Graphite Morphology and Chill Depth in Flake Graphite Cast Iron", 74 (2002) 285-290.
  15. Kowata T, Lee SH, Horie H, Hiratsuka S and Hareyama T, J. Jpn. Foundry Eng. Soc., "Effect of Sulfide Shape on Graphitization of Flake Graphite Cast Iron", 74 (2002) 578-583.
  16. Hiratsuka S, Lee SH, Horie H, Kowata T and Choi CO, J. Jpn. Foundry Eng. Soc., "Effect of Fading on Mechanical Properties and Sulfide Shape in Rare Earth Element Added Flake Graphite Cast Iron", 74 (2002) 584-589.
  17. Kowata T, Horie H, Hareyama T, Aida T and Miyake M, J. Jpn. Foundry Eng. Soc., "Effects of Minor Elements on Mechanical Properties of Flake Graphite Cast Iron Using High Manganese Steel Sheet Scrap", 75 (2003) 743-748.
  18. Riposan I, Chisamera M, Stan S, Stefan E and Hartung C, Key Eng. Mater., "Role of Lanthanum in Graphite Nucleation in Grey Cast Iron", 457 (2011) 19-24.
  19. Kanno T, Kimura H and Nakae H, 64th World Foundry Congress, ATF, Paris (2000).
  20. Kanno T, Morinaka M and Nakae H, J. Jpn. Foundry Eng. Soc., "Relationship between Variation of Eutectic Temperature and Melt Quality in Cast Iron", 74 (2002) 305-311.
  21. Chisamera M, Riposan I, Stan S, Stefan E and Costache G, Chn. Foundry, "Thermal Analysis Control of In-Mould and Ladle Inoculated Grey Cast Irons", 6 (2009) 145-151.
  22. Stan S, Chisamera M, Riposan I and Barstow M, J. Therm. Anal. Calorim., "Application of Thermal Analysis to Monitor the Quality of Hypoeutectic Cast Irons during Solidification in Sand and Metal Moulds", 110 (2012) 1185-1192. https://doi.org/10.1007/s10973-011-2128-y
  23. Saunders N, Guo Z, Li X, Miodownik AP and Schille JP, JOM, "Using JMatPro to Model Materials Properties and Behavior", 55 (2003) 60-65. https://doi.org/10.1007/s11837-003-0013-2
  24. ASTM A 367-60, "Standard Test Methods of Chill Testing of Cast Iron" (1999).
  25. ASTM A 247-67, "Standard Test Method for Evaluating the Microstructure of Graphite in Iron Castings" (1998).
  26. Dioszegi A, Fourlakidis V and Svensson IL, JTH Research Report, Jonkoping University, "Microstructure and Tensile Properties of Grey Cast Iron" (2004).
  27. Rys J, Stereology of Materials, Fotobit-Design, Cracow (1995).
  28. Fra E, Gorny M and Lopez HF, ISIJ Inter., "Eutectic Cell and Nodule Count in Cast Iron: Part II. Experimental Verification", 47 (2007) 269-276. https://doi.org/10.2355/isijinternational.47.269
  29. Fras E, Gorny M and Lopez HF, Metall. Mater. Trans. A, "Mechanism for the Role of Silicon on the Transition from Graphite to Cementite Eutectic in Cast Iron", 43 (2012) 4204- 4218. https://doi.org/10.1007/s11661-012-1222-5

Cited by

  1. Analysis of Eutectic Reaction as a Function of Cooling Rate in High Manganese Flake Graphite Cast Irons vol.33, pp.4, 2013, https://doi.org/10.7777/jkfs.2013.33.4.162