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pISSN : 1598-706X / eISSN : 2288-8381


(논문)연구논문

한국주조공학회지 (28권3호 119-123)

Wear Behavior of Die Steel in Molten Aluminum Alloy

용융 알루미늄 합금에 의한 다이캐스팅용 금형강의 용손거동

Sang-Ho Bae, Bok-Hyun Kang*, Ki-Young Kim*, Do-Hyang Kim, Gun Choi**, Bae-Ho Choi***

Yonsei University, *Korea University of Technology and Education, ** Korea Institute of Industrial Technology, *** CJC Co.

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 680oC~780oC. The rotating speed of the specimen was 4.5 rpm~20.0 rpm. 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