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Transactions of the Indian Institute of Metals

, Volume 72, Issue 9, pp 2319–2327 | Cite as

Effect of Pressure on Microstructure and Cooling Curves of A356 Aluminum Alloy During Solidification

  • Ali Fardi-Ilkhchy
  • Behzad Binesh
  • Mehdi Shaban GhazaniEmail author
Technical Paper
  • 20 Downloads

Abstract

During solidification process of metals and alloys in die casting, the cooling rate of molten material and also freezing time are affected by the heat transfer coefficient of metal/mold interface which is not constant at whole casting time. Therefore, determination of the cooling curves and the heat transfer coefficient is a crucial step in optimization of casting process by simulation because the resultant microstructure of cast components is affected by cooling rate. In the present study, the effect of applied pressure on cooling curves and microstructures of A356 aluminum alloy was investigated using a specially designed apparatus. Results showed that the cooling curves obtained from the central axis of cylindrical sample clearly represent the solidus and liquidus temperatures which can be used for determination of freezing time. It was observed that the solidification time decreases with increasing applied pressure. Also, the side thermocouples showed a temperature drop at the moment of applying pressure in which its magnitude increases with the increase in applied pressure. Moreover, the metallographic examinations showed that the microstructure of as-cast samples is refined with the increase in pressure. Also, the heat transfer coefficient obtained from experiments was used in the simulation of casting process and the simulated cooling curves were matched carefully with the experimental curves.

Keywords

Cooling curve Pressure Microstructure A356 aluminum 

Notes

References

  1. 1.
    Hamasaiid A, Dour G, Loulou T, and Dargusch M A, Int J Therm Sci 49 (2010) 365.CrossRefGoogle Scholar
  2. 2.
    Lee S, Gokhale A, Patel G, and Evans M, Mater Sci Eng A 427 (2006) 99.CrossRefGoogle Scholar
  3. 3.
    Yong M, and Clegg A, J Mater Process Technol 168 (2005) 262.CrossRefGoogle Scholar
  4. 4.
    Yong M, and Clegg A, J Mater Process Technol 145 (2004) 134.CrossRefGoogle Scholar
  5. 5.
    Do Lee C, Shin K S, Acta Mater 55 (2007) 4293.CrossRefGoogle Scholar
  6. 6.
    Cho I, and Hong C, Int J Cast Met Res 9 (1996) 227.CrossRefGoogle Scholar
  7. 7.
    Zhang M, Zhang W-w, Zhao H-d, Zhang D-T, and Li Y-Y, Trans Nonferr Met Soc 17 (2007) 496.CrossRefGoogle Scholar
  8. 8.
    Pastirčák R, Ščury J, Fecura T, editors, MATEC Web of Conferences; 2018: EDP Sciences.Google Scholar
  9. 9.
    Wang F-f, Wu K-y, Wang X-y, and Han Z-q, China Foundry 14 (2017) 327.CrossRefGoogle Scholar
  10. 10.
    Szeliga D, Kubiak K, Ziaja W, Cygan R, Suchy JS, Burbelko A, Nowak W J, and Sieniawski J, Exp Therm Fluid Sci 87 (2017) 149.CrossRefGoogle Scholar
  11. 11.
    Popescu M, Bedo T, and Varga B, Sci Bull Valahia Univ Mater Mech 14 (2016) 11.Google Scholar
  12. 12.
    Coates B, and Argyropoulos S A, Metall Mater Trans B 38 (2007) 243.CrossRefGoogle Scholar
  13. 13.
    Taha M, El-Mahallawy N, El-Mestekawi M, and Hassan A, Mater Sci Technol 17 (2001) 1093.CrossRefGoogle Scholar
  14. 14.
    Hamasaiid A, Dargusch M, Davidson C, Tovar S, Loulou T, Rezai-Aria F, and Dour G, Metall Mater Trans A 38 (2007) 1303.CrossRefGoogle Scholar
  15. 15.
    Sekhar J, Abbaschian G, Mehrabian R, Mat Sci Eng 40 (1979) 105.CrossRefGoogle Scholar
  16. 16.
    Ilkhchy A F, Jabbari M, and Davami P, Int Commun Heat Mass 39 (2012) 705.CrossRefGoogle Scholar
  17. 17.
    O’Mahoney D, Browne D J, Exp Therm Fluid Sci 22 (2000) 111.CrossRefGoogle Scholar
  18. 18.
    Santos C A, Quaresma J, and Garcia A, J Alloys Compd 319 (2001) 174.CrossRefGoogle Scholar

Copyright information

© The Indian Institute of Metals - IIM 2019

Authors and Affiliations

  1. 1.Department of Materials Science EngineeringUniversity of BonabBonabIran

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