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Wear Behavior of Die Steel in Molten Aluminum Alloy  

Bae, Sang-Ho (Dept. of Metallurgical Engineering, Yonsei University)
Kang, Bok-Hyun (Dept. of Materials Engineering, Korea University of Technology and Education)
Kim, Ki-Young (Dept. of Materials Engineering, Korea University of Technology and Education)
Kim, Do-Hyang (Dept. of Metallurgical Engineering, Yonsei University)
Choi, Gun (Korea Institute of Industrial Technology)
Choi, Bae-Ho (CJC Co. Ltd.)
Publication Information
Journal of Korea Foundry Society / v.28, no.3, 2008 , pp. 119-123 More about this Journal
Abstract
Wear test on two die steels for aluminum die casting was carried out by dipping and rotating the specimens into the molten aluminum maintained $680^{\circ}C{\sim}780^{\circ}C$. The rotating speed of the specimen was $4.5rpm{\sim}20.0rpm$. Diffusion layer was formed between the die steel and molten aluminum, and became thicker with dipping time. Wear rate was not proportional with the thickness of the diffusion layer, but was closely related to the density of the diffusion layer. Wear rate was little affected by the kind of die steel and by the microstructure such as martensite, tempered martensite, and pearlite. Specimen with nitrided surface showed good wear resistance, and its wear rate was decreased with increase in the thickness of nitrided layer. While whole surface was worn in heat treated specimens, wear of nitrided specimens was proceeded by pitting partially.
Keywords
Wear; Die steel; Diffusion layer; Nitrided layer;
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