Journal of Korea Foundry Society (한국주조공학회지)

Korea Foundry Society (한국주조공학회)
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Analysis of Microstructural Evolution During Directional Solidification of Ni-Base Superalloy CM247LC

니켈계 초내열합금 CM247LC의 일방향응고 시 미세조직 형성거동 분석

  • Seo, Seong-Moon (High Temperature Materials Research Group, Korea Institute of Materials Science) ;
  • Jeong, Hi-Won (High Temperature Materials Research Group, Korea Institute of Materials Science) ;
  • Yun, Dae Won (High Temperature Materials Research Group, Korea Institute of Materials Science) ;
  • Ahn, Young-Keun (High Temperature Materials Research Group, Korea Institute of Materials Science) ;
  • Lee, Je-Hyun (Department of Metallurgy & Materials Science and Engineering, Changwon National University) ;
  • Yoo, Young-Soo (High Temperature Materials Research Group, Korea Institute of Materials Science)
  • 서성문 (한국기계연구원 부설 재료연구소 내열재료연구그룹) ;
  • 정희원 (한국기계연구원 부설 재료연구소 내열재료연구그룹) ;
  • 윤대원 (한국기계연구원 부설 재료연구소 내열재료연구그룹) ;
  • 안영근 (한국기계연구원 부설 재료연구소 내열재료연구그룹) ;
  • 이재현 (창원대학교 금속신소재공학과) ;
  • 유영수 (한국기계연구원 부설 재료연구소 내열재료연구그룹)
  • Received : 2013.09.02
  • Accepted : 2013.10.16
  • Published : 2013.10.31
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Abstract

The Ni-base superalloy CM247LC was directionally solidified (DS) using the Bridgman-type furnace to understand the effect of the chill plate on the microstructural evolution, such as dendrite arm spacing, microporosity, and MC-type carbide. The DS process was also modeled by the PROCAST to predict the solidification rate, thermal gradient, and resultant cooling rate in the entire length of the DS specimen. Due to the quenching effects of chill plate, four distinct areas were found to form in the specimen, in which the solidification rate was changed, during DS at a given withdrawal rate of 0.083 mm/s. Among the microstructural features investigated, the dendrite arm spacings and average size of the MC-type carbide near the chill plate were found to be influenced by the quenching effect of the chill plate. However, no significant influence was found on the size and volume fraction of microporosity, and the volume fraction of the MC-type carbide. The relationship between the microstructural features and the solidification variables was also analyzed and discussed on the basis of a combination of experimental and modeling results.

Keywords

References

  1. Reed RC, The superalloys: Fundamentals and Applications, Cambridge Univ. press, NY, USA (2006) 121.
  2. Pinero SS, Pictraszkiewcz EF, Dube BP, Yee SJ, Levy RS, Hassan M, Valerio D and Hartmann SD, US patent 8172533, "Turbine blade internal cooling configuration" (2012).
  3. Acharya S and Mahmood G, The gas turbine handbook, NETL, DOE, USA (2007) 363.
  4. Versnyder FL and Shank ME, Mater. Sci. Eng., "The development of columnar grain and single crystal high temperature materials through directional solidification", 6 (1970) 213-247. https://doi.org/10.1016/0025-5416(70)90050-9
  5. McLean M, Directionally solidified materials for high temperature service, The Metal Society, London (1983) 11 151.
  6. http://www.esi-group.com/products/casting/casting-simulationsuite.
  7. Seo SM, Kim IS, Lee JH, Jo CY and Ogi K, J. Kor. Inst. Met. & Mater., "Prediction of solidification grain structure in the Ni-base superalloy CM247LC", 44 (2006) 44-54.
  8. Mills AF, Heat and mass transfer, Richard D Irwin, Inc., Massachusetts (1995) 1141.
  9. Seo SM, Kim IS, Lee JH, Jo CY, Miyahara H and Ogi K, Met. Mater. Int., "Grain structure and texture evolution during single crystal casting of the Ni-base superalloy CMSX-4", 15 (2009) 391-398. https://doi.org/10.1007/s12540-009-0391-2
  10. Gao SF, Liu L, Wang N, Zhao XB, Zhang J and Fu HZ, Metall. Mater. Trans. A, "Grain selection during casting Ni-base, single-crystal superalloys with spiral grain selector", 43A (2012) 3767-3775.
  11. Whitesell HS and Overfelt RA, Mater. Sci. Eng. A, "Influence of solidification variables on the microstructure, macrosegregation, and porosity of directionally solidified Mar- M247", A318 (2001) 264-276.
  12. Sims CT, Stoloff NS and Hagel WC, Superalloys II, John Wiley & Sons, New York (1987) 111.
  13. Seo SM, Kim IS, Lee JH, Jo CY, Miyahara H and Ogi K, Metall. Mater. Trans. A, "Eta phase and boride formation in directionally solidified Ni-base superalloy IN792+Hf", 38A (2007) 883-893.
  14. Lamm M and Singer RF, Metall. Mater. Trans. A, "The effect of casting conditions on the high-cycle fatigue properties of the single-crystal nickel-base superalloy PWA 1483", 38A (2007) 1177-1183.
  15. Chen QZ, Jones N and Knowles DM, Acta Mater., "The microstructures of base/modified RR2072 SX superalloys and their effects on creep properties at elevated temperatures", 50 (2002) 1095-1112. https://doi.org/10.1016/S1359-6454(01)00410-4
  16. Zhang J, Li J, Jin T, Sun X and Hu Z, J. Mater. Sci. Technol., "Effect of solidification parameters on the microstructure and creep property of a single crystal Ni-base superalloy", 26 (2010) 889-894.
  17. Zhou Y and Volek A, Mater. Sci. Eng. A, "Effect of carbon additions on hot tearing of a second generation nickel-base superalloy", 479 (2008) 324-332. https://doi.org/10.1016/j.msea.2007.06.076
  18. Murakumo T, Kobayashi T, Koizumi Y and Harada H, Acta Mater., "Creep behaviour of Ni-base single-crystal superalloys with various ${\gamma}$' volume fraction", 52 (2004) 3737-3744. https://doi.org/10.1016/j.actamat.2004.04.028
  19. Balikci E, Raman A and Mirshams RA, Metall. Mater. Trans. A, "Influence of various heat treatments on the microstructure of polycrystalline IN738LC", 28A (1997) 1993-2003.
  20. Kurz W and Fisher DJ, Acta Metall., "Dendrite growth at the limit of stability: Tip radius and spacing", 29 (1981) 11-20. https://doi.org/10.1016/0001-6160(81)90082-1
  21. Flemings MC, Solidification processing, McGraw-Hill, New York (1974) 146.
  22. Carter P, Cox DC, Gandin CA and Reed RC, Mater. Sci. Eng. A, "Process modelling of grain selection during the solidification of single crystal superalloy castings", A280 (2000) 233-246.
  23. Bhambri AK, Kattmis TZ and Morral JE, Metall. Trans. B, "Cast microstructure of Inconel 713C and its dependence on solidification variables", 6B (1975) 523-537.
  24. Seo SM, Lee JH, Yoo YS, Jo CY, Mihayara H and Ogi K, Metall. Mater. Trans. A, "A comparative study of the $\gamma/{\gamma}'$eutectic evolution during the solidification of Ni-base superalloys", 42A (2011) 3150-3159.
  25. Milenkovic S, Sabirov I and Llorca J, Mater. Lett., "Effect of the cooling rate on microstructure and hardness of Mar-M247 Ni-based superalloy", 73 (2012) 216-219. https://doi.org/10.1016/j.matlet.2012.01.028
  26. Lin CS and Sekhar JA, J. Mater. Sci., "Solidification morphology and semi-solid deformation in superalloy Rene 108: Part IV Directionally solidified microstructures", 29 (1994) 5005-5013. https://doi.org/10.1007/BF01151091
  27. Hong HU, Choi BG, Kim IS, Yoo YS and Jo CY, J. Mater. Sci., "Characterization of deformation mechanisms during low cycle fatigue of a single crystal nickel-based superalloy", 46 (2011) 5245-5251. https://doi.org/10.1007/s10853-011-5462-3
  28. Orlov MR, Russian Metallurgy, "Pore formation in singlecrystal turbine rotor blades during directional solidification", 2008 (2008) 56-60. https://doi.org/10.1134/S0036029508010114
  29. Lin CS and Sekhar JA, J. Mater. Sci., "Solidification morphology and semisolid deformation in the superalloy Rene 108: Part III Equiaxed solidified microstructures", 29 (1994) 3637-3642. https://doi.org/10.1007/BF00357329
  30. Brundidge CL, Vandrasek D, Wang B and Pollock TM, Metall. Mater. Trans. A, "Structure refinement by a liquid metal cooling solidification process for single-crystal nickelbase superalloys", 43A (2012) 965-976.
  31. Anton DL and Giamei AF, Mater. Sci. Eng., "Porosity distribution and growth during homogenization in single crystals of a nickel-base superalloy", 76 (1985) 173-180. https://doi.org/10.1016/0025-5416(85)90091-6
  32. Roskosz S and Adamiec J, Mater. Charact., "Methodology of quantitative evaluation of porosity, dendrite arm spacing and grain size in directionally solidified blades made of CMSX-6 nickel alloy", 60 (2009) 1120-1126. https://doi.org/10.1016/j.matchar.2009.01.024
  33. Wei CN, Bor HY and Chang L, Mater. Sci. Eng. A, "The effects of carbon content on the microstructure and elevated temperature strength of a nickel-base superalloy", 527 (2010) 3741-3747. https://doi.org/10.1016/j.msea.2010.03.053
  34. Al-Jarba KA and Fuchs GE, J. Metals, "Carbon-containing single-crystal nickel-based superalloys: Segregation behavior and carbide formation", 56 (2004) 50-55.

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