Journal of Korea Foundry Society (한국주조공학회지)

Korea Foundry Society (한국주조공학회)
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Effect of Sludge Formation on the Thickness of Die Soldering Reaction Layer in Al-9Si-0.3Mg Casting Alloy

Al-9Si-0.3Mg 주조용 합금에서 Sludge 형성이 금형소착 반응층 두께에 미치는 영향

  • Kim, Heon-Joo (Dept. of Metallurgical Eng., Pukyong National Univ.)
  • 김헌주 (부경대학교 공과대학 금속공학과)
  • Received : 2010.03.30
  • Accepted : 2010.04.14
  • Published : 2010.04.30
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Abstract

Effect of reaction time and sludge formation on the thickness of die soldering reaction layer has been studied in Al-9Si-0.3Mg casting alloy. Ternary ${\alpha}_{bcc}-Al_8Fe_2Si$ and ${\alpha}_{hcp}-Al_8Fe_2Si$ intermetallic compounds formed at the interface of SKD61 tool steel by interaction diffusion of Al, Fe and Si atoms after 0.5hr and 6hr immersion time, respectively. Binary ${\eta}-Fe_2Al_5$ additionally formed at the interface of SKD61 tool steel after 10hr immersion time. Thickness of soldering reaction layer in die surface increased as immersion time increased from 0.5hr to 24hr. Sludge formation was ascertained in the samples which were immersed in the melts more than 10hr. Reaction of die soldering after sludge formation was more accelerated than that of before sludge formation due to a decrease in Fe content, followed by higher diffusion rate of Al in the melt by sludge formation.

Keywords

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