Journal of Korea Foundry Society (한국주조공학회지)

Korea Foundry Society (한국주조공학회)
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Prediction of Mechanical Properties with Different Cooling Rates of AC4CH Cast Aluminum Alloy and its Application in Computer Simulation

알루미늄 AC4CH 합금주물의 냉각속도 변화에 따른 기계적 물성 예측 및 전산모사 적용

  • Lee, Byoung-Jun (Cyber Manufacturing Process Group, Korea Institute of Industrial Technology (KITECH)) ;
  • Cho, In-Sung (Cyber Manufacturing Process Group, Korea Institute of Industrial Technology (KITECH))
  • 이병준 (한국생산기술연구원 사이버제조공정그룹) ;
  • 조인성 (한국생산기술연구원 사이버제조공정그룹)
  • Received : 2018.03.09
  • Accepted : 2018.04.24
  • Published : 2018.04.30
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Abstract

In a numerical study, equations relating the mechanical properties and cooling rate in a casting process have been applied to an AC4CH cast aluminum alloy. Good agreement was found between the measured and predicted material properties. Step-shaped steel blocks were made to comprise a casting mold with a Y-shaped cavity. Thermometers were inserted into each step of the mold to investigate temperature changes. The microstructure and mechanical properties, such as hardness and tensile stress were measured for each cut of piece. The correlation between the cooling rate and SDAS was found by curved fitting. Moreover, both the solidification time and the temperature were simulated using a commercial package, ZCast. The simulation results for yield strength, tensile strength, elongation, and hardness were compared with experimental results. Using the estimated K and n values, the hardness values of a ship propeller were simulated, and the results were similar to those obtained for actual castings.

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References

  1. Lee WS and Ye BJ, J.Korea Foundry Society, "The variation of pore distribution behavior according to melt treatments for Al alloys", 19 (1999) 134-140.
  2. Sin SL, Han SW, Lee GH and Lee JH, J. Korea Foundry Society, "Factors affecting the accuracy in the measurement of hydrogen gas content of the aluminum melt during reduced pressure test", 23 (2003) 343-350.
  3. Kim JG, "Metallography", (1999) 369-387.
  4. Cho IS et al., "Effect of pressure on macrodefects in squeeze casting of an Al-4.5wt%Cu alloy", The Korean Institute of Metals and Materials, Korea (1997) 177.
  5. KITECH, Computer-assisted casting technology support casebook, KITECH, Korea 10-25.
  6. Lee YC, Choi JK and Hong CP, J. Korea Foundry Society, "Development of an integrated simulation system and its application to casting design", 17 (1997) 552-559.
  7. Lee MS, Kim KY and Kim SW, J. Korea Foundry Society, "Effect of Tilting Speed and Angle on Gas Entrapment in Gravity Diecasting", 14 (1994) 353-362.
  8. E. Niiyama, IMONO, "Calculation of solidification rate of shape casting by the flux-boundary method", 49 (1977) 608-613.
  9. K.J Oswalt and M.S Misra, International Journal of Cast Metals Research, "Dendrite arm spacing (DAS): a nondestructive test to evaluate tensile properties of premium quality aluminium alloy Al-Si-Mg castings", 8 (1980) 845-862.