발간논문

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Vol.18, No.5, 416 ~ 424, 1980
Title
Effect of Mold Ratios on the Casting Structures and Mechanical Properties in Cu - Al - Si Alloys
정태용Tae Yong Chung, 강춘식Choon Sik Kang
Abstract
Effect of metal mold ratio on the mechanical properties and cast structure of Cu-Al-Si alloy has been studied by using the metal mold which has various thickness. 1. Mechanical properties of specimen show the maximum value at metal mold ratio 1.5 and solidification rate 17℃/sec (1.27㎜/sec) 2. addition of 2.2wt%Si and suitable solidification rate 17℃/sec (1.27㎜/sec) increased equiaxed structure zone and decreased dendrite arm spacing. 3. Mechanical properties of specimen is decreased as metal mold preheating temperature increased. 4. Tensile strength and hardness of specimen which has silicon content of 2.2wt% is increased from 48㎏/㎟ to 53㎏/㎟, from H_B 107 to H_B 143 respectively than that of 1.4wt%Si. 5. β→α+γ₂ eutectoid transformation is suppressed with increasing solidification rate.
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