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Effect of Fe, Mn Contents of Al-9wt%Si-0.3wt%Mg Alloys on the Thickness of Die Soldering Reaction Layer for SKD61 Die Steel  

Kim, Heon-Joo (Dept. of Metallurgical System Eng., Pukyong National Univ.)
Cho, Chi-Man (Dept. of Metallurgical System Eng., Pukyong National Univ.)
Jeong, Chang-Yeol (KITECH, Gwangju Research Center, Materials & Components Team)
Publication Information
Journal of Korea Foundry Society / v.29, no.4, 2009 , pp. 169-175 More about this Journal
Abstract
Effect of iron and manganese contents on die soldering reaction has been studied in Al-9wt.%Si-0.3wt.%Mg alloy. Ternary ${\alpha}_{hcp}-Al_8Fe_2Si$ and ${\alpha}_{bcc}-Al_8Fe_2Si$ intermetallic compounds formed by interaction diffusion between Al-Si-Mg system alloy melt and SKD61 die steel surface. Thickness of soldering reaction layer in die steel surface decreased as Fe and Mn contents of the melts increased : When Fe content of Al-9wt.%Si-0.3wt.%Mg melts at constant 0.5wt%Mn content was 0.15wt.%, 0.45wt.% and 0.6wt.%, thickness of soldered layer of each alloy was $64.5{\mu}m,\;57.3{\mu}m$ and $46.9{\mu}m$ respectively. For Mn content of the alloy melts at constant 0.45wt.%Fe content was 0.30wt.%, 0.50wt.% and 0.70wt.%, thickness of soldered layer of each alloy was $66.1{\mu}m,\;57.3{\mu}m$ and $48.3{\mu}m$ respectively.
Keywords
Al-Si casting alloys; SKD61 die steel; Die soldering; Thickness of soldering reaction layer; Fe/Mn contents;
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