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Optimization of Solid Solution Treatment Process for a High Pressure Die Casting Al-10Si-0.3Mg-0.6Mn alloy to avoid Blistering and Improve the Strength of the Alloy

고압 다이캐스팅으로 제조된 Al-10Si-0.3Mg-0.6Mn 합금에서 blister 발생과 강도의 균형을 고려한 최적 열처리 공정 설계

  • Kim, Soo-Bae (Metallic Materials Department, Korea Institute of Material Science) ;
  • Cho, Young-Hee (Metallic Materials Department, Korea Institute of Material Science) ;
  • Jo, Min-Su (Metallic Materials Department, Korea Institute of Material Science) ;
  • Lee, Jung-Moo (Metallic Materials Department, Korea Institute of Material Science)
  • 김수배 (재료연구소(KIMS) 금속재료연구본부) ;
  • 조영희 (재료연구소(KIMS) 금속재료연구본부) ;
  • 조민수 (재료연구소(KIMS) 금속재료연구본부) ;
  • 이정무 (재료연구소(KIMS) 금속재료연구본부)
  • Received : 2020.02.06
  • Accepted : 2020.04.23
  • Published : 2020.06.30

Abstract

The aim of this study was to optimize a solid solution treatment for a high pressure die casting Al-10Si-0.3Mg-0.6Mn alloy to avoid blistering and to improve the strength of the alloy. To achieve this goal, the number density of the blisters and the strength of the alloy under various solid solution treatment (SST) conditions were evaluated. The SST was performed at 470, 490, 510 and 530℃ for 20, 60, 120, 240 and 480 min on the alloy. The number density of the blisters increased with the increasing temperature and time of the SST and the defect area fraction. The yield strength of the alloy after the T6 heat treatment increased with the increasing SST temperature and time. Based on the results, it is suggested that SST should be performed at 510℃ within 60 min. or at 470 and 490℃ within 240 min. to avoid blistering and to improve the strength.

Keywords

References

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