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순 (純) Al 주괴의 (鑄塊) 응고조직에 미치는 주형 (鑄型) 점결재의 (粘結材) 영향에 관한 연구
최창옥,이계완 ( Chang Ock Choi,Kye Wan Lee ) 한국주조공학회 1985 한국주조공학회지 Vol.5 No.1
The effects of mold binders on the formation of equiaxed zone of 99.8% AL ingots were studied with various sand molds and metal mold. The formation of equiaxed crystals are increased by furan, cement, CO₂and metal mold, and decreased by greensand and shell mold. Pouring temperature moat be kept as low as possible to get a fine grain Structure and to increase of volume of equiaxed zone. The effect of surface roughness on volume of equiaxed zone were depend upon by the kind of mold binders. These are caused by separation of crystals from the mold wall in the initial stage of solidification before formation of the stable solid skin.
주형점결재에 (鑄型粘結材) 의한 Al-Cu 합금의 응고조직에 관한 연구
최창옥,이계완 ( Chang Ock Choi,Kye Wan Lee ) 한국주조공학회 1986 한국주조공학회지 Vol.6 No.1
The effects of various kind of molds on cast structures were studied. Al-4.5% C1i and Al-8% Cu alloys. Five kinds of sand molds which were mixed with different binders and a metal mold were used. Density, dendrite arm spacing and dendrite arm length of the cast alloys were greatly affected by quantities and materials of mold binders. The macrostructures examined were entirely equiaxed grains with little influences of types of molds. It is possibly due to the separation of growing crystals from the mold wall at the inital stage of solidification.
Al-Si 계합금의 응고조직과 기계적 성질에 미치는 주형점결제의 영향에 관하여
최창옥,이계완 대한금속재료학회(대한금속학회) 1990 대한금속·재료학회지 Vol.28 No.8
The effects of various molds on solidification structures and mechanical properties were studied in Al-1%Si and Al-10%Si alloys. Green sand mold, COL sand mold, cement sand mold, furan sand mold and shell sand mold which were mixed with different binders and a metallic mold were used with different pouring temperatures of 680℃ and 760℃. The results are as follows ; Solidification variables such as mold binders pouring temperatures and quantities played an important rold in micro-and macro-structures. Fine dendrite arm spacing (DAS) and equiaxed crystals as well as good quality of mechanical properties in Al-Si alloys could be obtained by controlling of the soliddifiation variables. The DAS and mechanical properties in Al-Si alloys are related by nonlinear relation-ships. As a supplemental test method, improved reliability of the casting is possible when DAS measurements are in combintion with nondesturctive inspection method.