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중력 금형 주조한 Al-5wt%Mg 합금의 주조 조직과 기계적 성질에 미치는 응고 조건의 영향에 관한 연구
박준영,김종철,김홍범,최창옥 ( Jun Young Park,Jong Chul Kim,Hong Beom Kim,Chang Ock Choi ) 한국주조공학회 1997 한국주조공학회지 Vol.17 No.3
N/A This study has been carried out to investigate into the influence of solidification conditions mold on the structure and mechanical properties of Al-5wt%Mg alloy by metallic mold casting. The percentage of equiaxed grain of Al-5wt%Mg alloy castings increased both when pouring temperature decreased and when the low part or bottom of metallic mold was cooled. The hardness was checked and showed that hardness of outside in the castings was higher than that inside, and that it is the highest at the pouring temperature of 680℃. The castings had the highest U.T.S. and elongation when the bottom of metallic mold was cooled. At the same pouring temperature, the structure of castings was changed as the position of cooling parts of metallic mold was varied. When the castings were solidified through cooling of the bottom of the metallic mold, the morphology of Fe intermetallic compound has tendency to change to a Chinese script and the U.T.S. and elongation of Al-5wt.%Mg alloy castings was increased.