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http://dx.doi.org/10.7777/jkfs.2021.41.6.535

Effect of De-graphitization Heat Treatment on Interfacial Bonding Properties of Flake Graphite Cast Iron-Aluminum Dissimilar Materials Produced by High Pressure Die Casting  

Yang, Ji-Ba-Reum (Korea Institute of Industrial Technology)
Kim, TaeHyeong (Korea Institute of Industrial Technology)
Jeong, JaeHeon (Korea Institute of Industrial Technology)
Kim, SangWoo (Korea Institute of Industrial Technology)
Kim, YoonJun (Department of Materials Science and Engineering, Inha University)
Kim, DongEung (Korea Institute of Industrial Technology)
Shin, JeSik (Korea Institute of Industrial Technology)
Publication Information
Journal of Korea Foundry Society / v.41, no.6, 2021 , pp. 535-542 More about this Journal
Abstract
In this study, to improve the interfacial bond strength of cast iron-aluminum dissimilar materials, graphite was removed to a certain depth from the cast iron surface through de-graphitization heat treatment. As the heat treatment time increased, the depth at which graphite was removed increased, showing a linear relationship between the heat treatment time and depth. Aluminum was filled to a certain depth on the de-graphitized cast iron surface through die-casting method, and no intermetallic compounds were formed on the cast iron-aluminum interface. The interfacial bonding strength showed a value of 90 MPa regardless of the heat treatment time, which is very high compared to the 12MPa bonding strength of the material without de-graphitization heat treatment. This result is thought to be due to the mechanical bonding of the undercut structure as the liquid aluminum, penetrated by the high pressure die-casting process, solidified in the de-graphitized region of the cast iron.
Keywords
Aluminum alloys; Gray-iron; De-graphitization time; De-graphitization depth and Interfacial bonding strength;
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