Journal of Korea Foundry Society (한국주조공학회지)

Korea Foundry Society (한국주조공학회)
권호 표지

Density and Mechanical Properties of Aluminum Lost Foam Castings

알루미늄 합금 소실모형주조재의 밀도 및 기계적 성질

  • Kim, Ki-Young (Dept. of Materials Engineering Korea University of Technology and Education) ;
  • Oh, Don-Suk (Dept. of Materials Engineering Korea University of Technology and Education) ;
  • Choe, Kyeong-Hwan (Korea Institute of Industrial Technology) ;
  • Cho, Gue-Serb (Korea Institute of Industrial Technology) ;
  • Lee, Kyung-Whoan (Korea Institute of Industrial Technology)
  • Published : 2004.04.20
Download PDF
⟨ Previous Next ⟩

Abstract

Gas porosity which is a common defect in aluminum alloy casting, is also thought to be severer in aluminum alloy castings produced by lost foam process due to the pyrolysis of the polystyrene foam pattern during pouring. Fundamental experiments were carried out to evaluate the effect of process variables such as the melt treatment, the cooling rate and pouring temperature on the density and mechanical properties in A356.2 castings with simple bar shape. The density of grain refined specimen was slightly lower than that of degassed one, but was higher than that of no treated one and that of shot ball packed specimen was higher than the other specimens. The tensile strength and elongation were in the ranges of $200{\sim}230MPa$ and $0.5{\sim}1.5%$ respectively. The density and hardness of lost foam cast specimens decreased with increase in pouring temperature.

Keywords

References

  1. J. Pletka and J. Drelich, Minerals & Metallurgical Processing, Recovery of expanded polystylene from coated patterns rejected from lost foam casting, 19(2002),25
  2. X. Chen and J. E. Gruzleski, Int. J. Cast Metals Res., 'Influence of melt cleaniness on pore fonnation in aluminum- silicon alloys', 9( 1996), 17 https://doi.org/10.1080/13640461.1996.11819640
  3. S. Bennett, T. Moody, A. Vrieze, M. Jackson, D. R. Askeland and C. W. Ramsay, AFS Transactions, 'Pyrolysis Defects in Aluminum Lost Foam Castings', 108(2000), 795
  4. T. V. Molibog and H. Littleton, AFS Transactions, 'Degradation of Expanded Polystylene Patterns', 110(2002), 1483-1484
  5. K. Y. Kim, K. W. Lee and K. H. Rim, J. of KFS, 'Investigation on Characteristics of Various Mold Packing Materials in Lost Foam Casting of Aluminum Alloy', 22(2002), 137
  6. A. Samuel and F. Samuel, AFS Transactions, 'Porosity Factor in Quality Aluminum Castings', 100(1992), 657
  7. X. Yao and S. Shivkumar, Materials Science and Technology, 'Mould filling characteristic in lost foam casting process', 13(1997),841 https://doi.org/10.1179/026708397790285511
  8. C. Bates, H. Littleton, B. McMellon and P. Stroom, AFS Transactions, 'Technological Developments and Worldwide Market Growth in Lost Foam Casting Production', 109(2001),1563-1565